compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 #define HCAST(type, handle) ((type)(intptr_t)handle)
  10
  11 static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13 int err_win_to_posix(DWORD winerr)
  14 {
  15         int error = ENOSYS;
  16         switch(winerr) {
  17         case ERROR_ACCESS_DENIED: error = EACCES; break;
  18         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23         case ERROR_BAD_COMMAND: error = EIO; break;
  24         case ERROR_BAD_DEVICE: error = ENODEV; break;
  25         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28         case ERROR_BAD_LENGTH: error = EINVAL; break;
  29         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30         case ERROR_BAD_PIPE: error = EPIPE; break;
  31         case ERROR_BAD_UNIT: error = ENODEV; break;
  32         case ERROR_BAD_USERNAME: error = EINVAL; break;
  33         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35         case ERROR_BUSY: error = EBUSY; break;
  36         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38         case ERROR_CANNOT_MAKE: error = EACCES; break;
  39         case ERROR_CANTOPEN: error = EIO; break;
  40         case ERROR_CANTREAD: error = EIO; break;
  41         case ERROR_CANTWRITE: error = EIO; break;
  42         case ERROR_CRC: error = EIO; break;
  43         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46         case ERROR_DIRECTORY: error = EINVAL; break;
  47         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48         case ERROR_DISK_CHANGE: error = EIO; break;
  49         case ERROR_DISK_FULL: error = ENOSPC; break;
  50         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54         case ERROR_FILE_EXISTS: error = EEXIST; break;
  55         case ERROR_FILE_INVALID: error = ENODEV; break;
  56         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57         case ERROR_GEN_FAILURE: error = EIO; break;
  58         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60         case ERROR_INVALID_ACCESS: error = EACCES; break;
  61         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63         case ERROR_INVALID_DATA: error = EINVAL; break;
  64         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68         case ERROR_INVALID_HANDLE: error = EBADF; break;
  69         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70         case ERROR_INVALID_NAME: error = EINVAL; break;
  71         case ERROR_INVALID_OWNER: error = EINVAL; break;
  72         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78         case ERROR_IO_DEVICE: error = EIO; break;
  79         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80         case ERROR_LOCKED: error = EBUSY; break;
  81         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82         case ERROR_LOGON_FAILURE: error = EACCES; break;
  83         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85         case ERROR_MORE_DATA: error = EPIPE; break;
  86         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87         case ERROR_NOACCESS: error = EFAULT; break;
  88         case ERROR_NONE_MAPPED: error = EINVAL; break;
  89         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90         case ERROR_NOT_READY: error = EAGAIN; break;
  91         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92         case ERROR_NO_DATA: error = EPIPE; break;
  93         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96         case ERROR_OPEN_FAILED: error = EIO; break;
  97         case ERROR_OPEN_FILES: error = EBUSY; break;
  98         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101         case ERROR_PATH_BUSY: error = EBUSY; break;
 102         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103         case ERROR_PIPE_BUSY: error = EBUSY; break;
 104         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108         case ERROR_READ_FAULT: error = EIO; break;
 109         case ERROR_SEEK: error = EIO; break;
 110         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114         case ERROR_SWAPERROR: error = ENOENT; break;
 115         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120         case ERROR_WRITE_FAULT: error = EIO; break;
 121         case ERROR_WRITE_PROTECT: error = EROFS; break;
 122         }
 123         return error;
 124 }
 125
 126 static inline int is_file_in_use_error(DWORD errcode)
 127 {
 128         switch (errcode) {
 129         case ERROR_SHARING_VIOLATION:
 130         case ERROR_ACCESS_DENIED:
 131                 return 1;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int read_yes_no_answer(void)
 138 {
 139         char answer[1024];
 140
 141         if (fgets(answer, sizeof(answer), stdin)) {
 142                 size_t answer_len = strlen(answer);
 143                 int got_full_line = 0, c;
 144
 145                 /* remove the newline */
 146                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 147                         answer[answer_len-2] = '\0';
 148                         got_full_line = 1;
 149                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 150                         answer[answer_len-1] = '\0';
 151                         got_full_line = 1;
 152                 }
 153                 /* flush the buffer in case we did not get the full line */
 154                 if (!got_full_line)
 155                         while ((c = getchar()) != EOF && c != '\n')
 156                                 ;
 157         } else
 158                 /* we could not read, return the
 159                  * default answer which is no */
 160                 return 0;
 161
 162         if (tolower(answer[0]) == 'y' && !answer[1])
 163                 return 1;
 164         if (!strncasecmp(answer, "yes", sizeof(answer)))
 165                 return 1;
 166         if (tolower(answer[0]) == 'n' && !answer[1])
 167                 return 0;
 168         if (!strncasecmp(answer, "no", sizeof(answer)))
 169                 return 0;
 170
 171         /* did not find an answer we understand */
 172         return -1;
 173 }
 174
 175 static int ask_yes_no_if_possible(const char *format, ...)
 176 {
 177         char question[4096];
 178         const char *retry_hook[] = { NULL, NULL, NULL };
 179         va_list args;
 180
 181         va_start(args, format);
 182         vsnprintf(question, sizeof(question), format, args);
 183         va_end(args);
 184
 185         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 186                 retry_hook[1] = question;
 187                 return !run_command_v_opt(retry_hook, 0);
 188         }
 189
 190         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 191                 return 0;
 192
 193         while (1) {
 194                 int answer;
 195                 fprintf(stderr, "%s (y/n) ", question);
 196
 197                 if ((answer = read_yes_no_answer()) >= 0)
 198                         return answer;
 199
 200                 fprintf(stderr, "Sorry, I did not understand your answer. "
 201                                 "Please type 'y' or 'n'\n");
 202         }
 203 }
 204
 205 int mingw_unlink(const char *pathname)
 206 {
 207         int ret, tries = 0;
 208         wchar_t wpathname[MAX_PATH];
 209         if (xutftowcs_path(wpathname, pathname) < 0)
 210                 return -1;
 211
 212         /* read-only files cannot be removed */
 213         _wchmod(wpathname, 0666);
 214         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 215                 if (!is_file_in_use_error(GetLastError()))
 216                         break;
 217                 /*
 218                  * We assume that some other process had the source or
 219                  * destination file open at the wrong moment and retry.
 220                  * In order to give the other process a higher chance to
 221                  * complete its operation, we give up our time slice now.
 222                  * If we have to retry again, we do sleep a bit.
 223                  */
 224                 Sleep(delay[tries]);
 225                 tries++;
 226         }
 227         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 228                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 229                         "Should I try again?", pathname))
 230                ret = _wunlink(wpathname);
 231         return ret;
 232 }
 233
 234 static int is_dir_empty(const wchar_t *wpath)
 235 {
 236         WIN32_FIND_DATAW findbuf;
 237         HANDLE handle;
 238         wchar_t wbuf[MAX_PATH + 2];
 239         wcscpy(wbuf, wpath);
 240         wcscat(wbuf, L"\\*");
 241         handle = FindFirstFileW(wbuf, &findbuf);
 242         if (handle == INVALID_HANDLE_VALUE)
 243                 return GetLastError() == ERROR_NO_MORE_FILES;
 244
 245         while (!wcscmp(findbuf.cFileName, L".") ||
 246                         !wcscmp(findbuf.cFileName, L".."))
 247                 if (!FindNextFileW(handle, &findbuf)) {
 248                         DWORD err = GetLastError();
 249                         FindClose(handle);
 250                         return err == ERROR_NO_MORE_FILES;
 251                 }
 252         FindClose(handle);
 253         return 0;
 254 }
 255
 256 int mingw_rmdir(const char *pathname)
 257 {
 258         int ret, tries = 0;
 259         wchar_t wpathname[MAX_PATH];
 260         if (xutftowcs_path(wpathname, pathname) < 0)
 261                 return -1;
 262
 263         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 264                 if (!is_file_in_use_error(GetLastError()))
 265                         errno = err_win_to_posix(GetLastError());
 266                 if (errno != EACCES)
 267                         break;
 268                 if (!is_dir_empty(wpathname)) {
 269                         errno = ENOTEMPTY;
 270                         break;
 271                 }
 272                 /*
 273                  * We assume that some other process had the source or
 274                  * destination file open at the wrong moment and retry.
 275                  * In order to give the other process a higher chance to
 276                  * complete its operation, we give up our time slice now.
 277                  * If we have to retry again, we do sleep a bit.
 278                  */
 279                 Sleep(delay[tries]);
 280                 tries++;
 281         }
 282         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 283                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 284                         "Should I try again?", pathname))
 285                ret = _wrmdir(wpathname);
 286         if (!ret)
 287                 invalidate_lstat_cache();
 288         return ret;
 289 }
 290
 291 static inline int needs_hiding(const char *path)
 292 {
 293         const char *basename;
 294
 295         if (hide_dotfiles == HIDE_DOTFILES_FALSE)
 296                 return 0;
 297
 298         /* We cannot use basename(), as it would remove trailing slashes */
 299         mingw_skip_dos_drive_prefix((char **)&path);
 300         if (!*path)
 301                 return 0;
 302
 303         for (basename = path; *path; path++)
 304                 if (is_dir_sep(*path)) {
 305                         do {
 306                                 path++;
 307                         } while (is_dir_sep(*path));
 308                         /* ignore trailing slashes */
 309                         if (*path)
 310                                 basename = path;
 311                 }
 312
 313         if (hide_dotfiles == HIDE_DOTFILES_TRUE)
 314                 return *basename == '.';
 315
 316         assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
 317         return !strncasecmp(".git", basename, 4) &&
 318                 (!basename[4] || is_dir_sep(basename[4]));
 319 }
 320
 321 static int set_hidden_flag(const wchar_t *path, int set)
 322 {
 323         DWORD original = GetFileAttributesW(path), modified;
 324         if (set)
 325                 modified = original | FILE_ATTRIBUTE_HIDDEN;
 326         else
 327                 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
 328         if (original == modified || SetFileAttributesW(path, modified))
 329                 return 0;
 330         errno = err_win_to_posix(GetLastError());
 331         return -1;
 332 }
 333
 334 int mingw_mkdir(const char *path, int mode)
 335 {
 336         int ret;
 337         wchar_t wpath[MAX_PATH];
 338
 339         if (!is_valid_win32_path(path)) {
 340                 errno = EINVAL;
 341                 return -1;
 342         }
 343
 344         if (xutftowcs_path(wpath, path) < 0)
 345                 return -1;
 346         ret = _wmkdir(wpath);
 347         if (!ret && needs_hiding(path))
 348                 return set_hidden_flag(wpath, 1);
 349         return ret;
 350 }
 351
 352 int mingw_open (const char *filename, int oflags, ...)
 353 {
 354         va_list args;
 355         unsigned mode;
 356         int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
 357         wchar_t wfilename[MAX_PATH];
 358
 359         va_start(args, oflags);
 360         mode = va_arg(args, int);
 361         va_end(args);
 362
 363         if (!is_valid_win32_path(filename)) {
 364                 errno = create ? EINVAL : ENOENT;
 365                 return -1;
 366         }
 367
 368         if (filename && !strcmp(filename, "/dev/null"))
 369                 filename = "nul";
 370
 371         if (xutftowcs_path(wfilename, filename) < 0)
 372                 return -1;
 373         fd = _wopen(wfilename, oflags, mode);
 374
 375         if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 376                 DWORD attrs = GetFileAttributesW(wfilename);
 377                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 378                         errno = EISDIR;
 379         }
 380         if ((oflags & O_CREAT) && needs_hiding(filename)) {
 381                 /*
 382                  * Internally, _wopen() uses the CreateFile() API which errors
 383                  * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
 384                  * specified and an already existing file's attributes do not
 385                  * match *exactly*. As there is no mode or flag we can set that
 386                  * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
 387                  * again *without* the O_CREAT flag (that corresponds to the
 388                  * CREATE_ALWAYS flag of CreateFile()).
 389                  */
 390                 if (fd < 0 && errno == EACCES)
 391                         fd = _wopen(wfilename, oflags & ~O_CREAT, mode);
 392                 if (fd >= 0 && set_hidden_flag(wfilename, 1))
 393                         warning("could not mark '%s' as hidden.", filename);
 394         }
 395         return fd;
 396 }
 397
 398 static BOOL WINAPI ctrl_ignore(DWORD type)
 399 {
 400         return TRUE;
 401 }
 402
 403 #undef fgetc
 404 int mingw_fgetc(FILE *stream)
 405 {
 406         int ch;
 407         if (!isatty(_fileno(stream)))
 408                 return fgetc(stream);
 409
 410         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 411         while (1) {
 412                 ch = fgetc(stream);
 413                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 414                         break;
 415
 416                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 417                 mingw_raise(SIGINT);
 418         }
 419         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 420         return ch;
 421 }
 422
 423 #undef fopen
 424 FILE *mingw_fopen (const char *filename, const char *otype)
 425 {
 426         int hide = needs_hiding(filename);
 427         FILE *file;
 428         wchar_t wfilename[MAX_PATH], wotype[4];
 429         if (!is_valid_win32_path(filename)) {
 430                 int create = otype && strchr(otype, 'w');
 431                 errno = create ? EINVAL : ENOENT;
 432                 return NULL;
 433         }
 434         if (filename && !strcmp(filename, "/dev/null"))
 435                 filename = "nul";
 436         if (xutftowcs_path(wfilename, filename) < 0 ||
 437                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 438                 return NULL;
 439         if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 440                 error("could not unhide %s", filename);
 441                 return NULL;
 442         }
 443         file = _wfopen(wfilename, wotype);
 444         if (!file && GetLastError() == ERROR_INVALID_NAME)
 445                 errno = ENOENT;
 446         if (file && hide && set_hidden_flag(wfilename, 1))
 447                 warning("could not mark '%s' as hidden.", filename);
 448         return file;
 449 }
 450
 451 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 452 {
 453         int hide = needs_hiding(filename);
 454         FILE *file;
 455         wchar_t wfilename[MAX_PATH], wotype[4];
 456         if (!is_valid_win32_path(filename)) {
 457                 int create = otype && strchr(otype, 'w');
 458                 errno = create ? EINVAL : ENOENT;
 459                 return NULL;
 460         }
 461         if (filename && !strcmp(filename, "/dev/null"))
 462                 filename = "nul";
 463         if (xutftowcs_path(wfilename, filename) < 0 ||
 464                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 465                 return NULL;
 466         if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 467                 error("could not unhide %s", filename);
 468                 return NULL;
 469         }
 470         file = _wfreopen(wfilename, wotype, stream);
 471         if (file && hide && set_hidden_flag(wfilename, 1))
 472                 warning("could not mark '%s' as hidden.", filename);
 473         return file;
 474 }
 475
 476 #undef fflush
 477 int mingw_fflush(FILE *stream)
 478 {
 479         int ret = fflush(stream);
 480
 481         /*
 482          * write() is used behind the scenes of stdio output functions.
 483          * Since git code does not check for errors after each stdio write
 484          * operation, it can happen that write() is called by a later
 485          * stdio function even if an earlier write() call failed. In the
 486          * case of a pipe whose readable end was closed, only the first
 487          * call to write() reports EPIPE on Windows. Subsequent write()
 488          * calls report EINVAL. It is impossible to notice whether this
 489          * fflush invocation triggered such a case, therefore, we have to
 490          * catch all EINVAL errors whole-sale.
 491          */
 492         if (ret && errno == EINVAL)
 493                 errno = EPIPE;
 494
 495         return ret;
 496 }
 497
 498 #undef write
 499 ssize_t mingw_write(int fd, const void *buf, size_t len)
 500 {
 501         ssize_t result = write(fd, buf, len);
 502
 503         if (result < 0 && errno == EINVAL && buf) {
 504                 /* check if fd is a pipe */
 505                 HANDLE h = (HANDLE) _get_osfhandle(fd);
 506                 if (GetFileType(h) == FILE_TYPE_PIPE)
 507                         errno = EPIPE;
 508                 else
 509                         errno = EINVAL;
 510         }
 511
 512         return result;
 513 }
 514
 515 int mingw_access(const char *filename, int mode)
 516 {
 517         wchar_t wfilename[MAX_PATH];
 518         if (xutftowcs_path(wfilename, filename) < 0)
 519                 return -1;
 520         /* X_OK is not supported by the MSVCRT version */
 521         return _waccess(wfilename, mode & ~X_OK);
 522 }
 523
 524 int mingw_chdir(const char *dirname)
 525 {
 526         wchar_t wdirname[MAX_PATH];
 527         if (xutftowcs_path(wdirname, dirname) < 0)
 528                 return -1;
 529         return _wchdir(wdirname);
 530 }
 531
 532 int mingw_chmod(const char *filename, int mode)
 533 {
 534         wchar_t wfilename[MAX_PATH];
 535         if (xutftowcs_path(wfilename, filename) < 0)
 536                 return -1;
 537         return _wchmod(wfilename, mode);
 538 }
 539
 540 /*
 541  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 542  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 543  */
 544 static inline long long filetime_to_hnsec(const FILETIME *ft)
 545 {
 546         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 547         /* Windows to Unix Epoch conversion */
 548         return winTime - 116444736000000000LL;
 549 }
 550
 551 static inline time_t filetime_to_time_t(const FILETIME *ft)
 552 {
 553         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 554 }
 555
 556 /**
 557  * Verifies that safe_create_leading_directories() would succeed.
 558  */
 559 static int has_valid_directory_prefix(wchar_t *wfilename)
 560 {
 561         int n = wcslen(wfilename);
 562
 563         while (n > 0) {
 564                 wchar_t c = wfilename[--n];
 565                 DWORD attributes;
 566
 567                 if (!is_dir_sep(c))
 568                         continue;
 569
 570                 wfilename[n] = L'\0';
 571                 attributes = GetFileAttributesW(wfilename);
 572                 wfilename[n] = c;
 573                 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 574                                 attributes == FILE_ATTRIBUTE_DEVICE)
 575                         return 1;
 576                 if (attributes == INVALID_FILE_ATTRIBUTES)
 577                         switch (GetLastError()) {
 578                         case ERROR_PATH_NOT_FOUND:
 579                                 continue;
 580                         case ERROR_FILE_NOT_FOUND:
 581                                 /* This implies parent directory exists. */
 582                                 return 1;
 583                         }
 584                 return 0;
 585         }
 586         return 1;
 587 }
 588
 589 /* We keep the do_lstat code in a separate function to avoid recursion.
 590  * When a path ends with a slash, the stat will fail with ENOENT. In
 591  * this case, we strip the trailing slashes and stat again.
 592  *
 593  * If follow is true then act like stat() and report on the link
 594  * target. Otherwise report on the link itself.
 595  */
 596 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 597 {
 598         WIN32_FILE_ATTRIBUTE_DATA fdata;
 599         wchar_t wfilename[MAX_PATH];
 600         if (xutftowcs_path(wfilename, file_name) < 0)
 601                 return -1;
 602
 603         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 604                 buf->st_ino = 0;
 605                 buf->st_gid = 0;
 606                 buf->st_uid = 0;
 607                 buf->st_nlink = 1;
 608                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 609                 buf->st_size = fdata.nFileSizeLow |
 610                         (((off_t)fdata.nFileSizeHigh)<<32);
 611                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 612                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 613                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 614                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 615                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 616                         WIN32_FIND_DATAW findbuf;
 617                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 618                         if (handle != INVALID_HANDLE_VALUE) {
 619                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 620                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 621                                         if (follow) {
 622                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 623                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 624                                         } else {
 625                                                 buf->st_mode = S_IFLNK;
 626                                         }
 627                                         buf->st_mode |= S_IREAD;
 628                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 629                                                 buf->st_mode |= S_IWRITE;
 630                                 }
 631                                 FindClose(handle);
 632                         }
 633                 }
 634                 return 0;
 635         }
 636         switch (GetLastError()) {
 637         case ERROR_ACCESS_DENIED:
 638         case ERROR_SHARING_VIOLATION:
 639         case ERROR_LOCK_VIOLATION:
 640         case ERROR_SHARING_BUFFER_EXCEEDED:
 641                 errno = EACCES;
 642                 break;
 643         case ERROR_BUFFER_OVERFLOW:
 644                 errno = ENAMETOOLONG;
 645                 break;
 646         case ERROR_NOT_ENOUGH_MEMORY:
 647                 errno = ENOMEM;
 648                 break;
 649         case ERROR_PATH_NOT_FOUND:
 650                 if (!has_valid_directory_prefix(wfilename)) {
 651                         errno = ENOTDIR;
 652                         break;
 653                 }
 654                 /* fallthru */
 655         default:
 656                 errno = ENOENT;
 657                 break;
 658         }
 659         return -1;
 660 }
 661
 662 /* We provide our own lstat/fstat functions, since the provided
 663  * lstat/fstat functions are so slow. These stat functions are
 664  * tailored for Git's usage (read: fast), and are not meant to be
 665  * complete. Note that Git stat()s are redirected to mingw_lstat()
 666  * too, since Windows doesn't really handle symlinks that well.
 667  */
 668 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 669 {
 670         int namelen;
 671         char alt_name[PATH_MAX];
 672
 673         if (!do_lstat(follow, file_name, buf))
 674                 return 0;
 675
 676         /* if file_name ended in a '/', Windows returned ENOENT;
 677          * try again without trailing slashes
 678          */
 679         if (errno != ENOENT)
 680                 return -1;
 681
 682         namelen = strlen(file_name);
 683         if (namelen && file_name[namelen-1] != '/')
 684                 return -1;
 685         while (namelen && file_name[namelen-1] == '/')
 686                 --namelen;
 687         if (!namelen || namelen >= PATH_MAX)
 688                 return -1;
 689
 690         memcpy(alt_name, file_name, namelen);
 691         alt_name[namelen] = 0;
 692         return do_lstat(follow, alt_name, buf);
 693 }
 694
 695 int mingw_lstat(const char *file_name, struct stat *buf)
 696 {
 697         return do_stat_internal(0, file_name, buf);
 698 }
 699 int mingw_stat(const char *file_name, struct stat *buf)
 700 {
 701         return do_stat_internal(1, file_name, buf);
 702 }
 703
 704 int mingw_fstat(int fd, struct stat *buf)
 705 {
 706         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 707         BY_HANDLE_FILE_INFORMATION fdata;
 708
 709         if (fh == INVALID_HANDLE_VALUE) {
 710                 errno = EBADF;
 711                 return -1;
 712         }
 713         /* direct non-file handles to MS's fstat() */
 714         if (GetFileType(fh) != FILE_TYPE_DISK)
 715                 return _fstati64(fd, buf);
 716
 717         if (GetFileInformationByHandle(fh, &fdata)) {
 718                 buf->st_ino = 0;
 719                 buf->st_gid = 0;
 720                 buf->st_uid = 0;
 721                 buf->st_nlink = 1;
 722                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 723                 buf->st_size = fdata.nFileSizeLow |
 724                         (((off_t)fdata.nFileSizeHigh)<<32);
 725                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 726                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 727                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 728                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 729                 return 0;
 730         }
 731         errno = EBADF;
 732         return -1;
 733 }
 734
 735 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 736 {
 737         long long winTime = t * 10000000LL + 116444736000000000LL;
 738         ft->dwLowDateTime = winTime;
 739         ft->dwHighDateTime = winTime >> 32;
 740 }
 741
 742 int mingw_utime (const char *file_name, const struct utimbuf *times)
 743 {
 744         FILETIME mft, aft;
 745         int fh, rc;
 746         DWORD attrs;
 747         wchar_t wfilename[MAX_PATH];
 748         if (xutftowcs_path(wfilename, file_name) < 0)
 749                 return -1;
 750
 751         /* must have write permission */
 752         attrs = GetFileAttributesW(wfilename);
 753         if (attrs != INVALID_FILE_ATTRIBUTES &&
 754             (attrs & FILE_ATTRIBUTE_READONLY)) {
 755                 /* ignore errors here; open() will report them */
 756                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 757         }
 758
 759         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 760                 rc = -1;
 761                 goto revert_attrs;
 762         }
 763
 764         if (times) {
 765                 time_t_to_filetime(times->modtime, &mft);
 766                 time_t_to_filetime(times->actime, &aft);
 767         } else {
 768                 GetSystemTimeAsFileTime(&mft);
 769                 aft = mft;
 770         }
 771         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 772                 errno = EINVAL;
 773                 rc = -1;
 774         } else
 775                 rc = 0;
 776         close(fh);
 777
 778 revert_attrs:
 779         if (attrs != INVALID_FILE_ATTRIBUTES &&
 780             (attrs & FILE_ATTRIBUTE_READONLY)) {
 781                 /* ignore errors again */
 782                 SetFileAttributesW(wfilename, attrs);
 783         }
 784         return rc;
 785 }
 786
 787 #undef strftime
 788 size_t mingw_strftime(char *s, size_t max,
 789                       const char *format, const struct tm *tm)
 790 {
 791         size_t ret = strftime(s, max, format, tm);
 792
 793         if (!ret && errno == EINVAL)
 794                 die("invalid strftime format: '%s'", format);
 795         return ret;
 796 }
 797
 798 unsigned int sleep (unsigned int seconds)
 799 {
 800         Sleep(seconds*1000);
 801         return 0;
 802 }
 803
 804 char *mingw_mktemp(char *template)
 805 {
 806         wchar_t wtemplate[MAX_PATH];
 807         if (xutftowcs_path(wtemplate, template) < 0)
 808                 return NULL;
 809         if (!_wmktemp(wtemplate))
 810                 return NULL;
 811         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 812                 return NULL;
 813         return template;
 814 }
 815
 816 int mkstemp(char *template)
 817 {
 818         char *filename = mktemp(template);
 819         if (filename == NULL)
 820                 return -1;
 821         return open(filename, O_RDWR | O_CREAT, 0600);
 822 }
 823
 824 int gettimeofday(struct timeval *tv, void *tz)
 825 {
 826         FILETIME ft;
 827         long long hnsec;
 828
 829         GetSystemTimeAsFileTime(&ft);
 830         hnsec = filetime_to_hnsec(&ft);
 831         tv->tv_sec = hnsec / 10000000;
 832         tv->tv_usec = (hnsec % 10000000) / 10;
 833         return 0;
 834 }
 835
 836 int pipe(int filedes[2])
 837 {
 838         HANDLE h[2];
 839
 840         /* this creates non-inheritable handles */
 841         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 842                 errno = err_win_to_posix(GetLastError());
 843                 return -1;
 844         }
 845         filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 846         if (filedes[0] < 0) {
 847                 CloseHandle(h[0]);
 848                 CloseHandle(h[1]);
 849                 return -1;
 850         }
 851         filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 852         if (filedes[1] < 0) {
 853                 close(filedes[0]);
 854                 CloseHandle(h[1]);
 855                 return -1;
 856         }
 857         return 0;
 858 }
 859
 860 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 861 {
 862         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 863         memcpy(result, gmtime(timep), sizeof(struct tm));
 864         return result;
 865 }
 866
 867 struct tm *localtime_r(const time_t *timep, struct tm *result)
 868 {
 869         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 870         memcpy(result, localtime(timep), sizeof(struct tm));
 871         return result;
 872 }
 873
 874 char *mingw_getcwd(char *pointer, int len)
 875 {
 876         wchar_t wpointer[MAX_PATH];
 877         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 878                 return NULL;
 879         if (xwcstoutf(pointer, wpointer, len) < 0)
 880                 return NULL;
 881         convert_slashes(pointer);
 882         return pointer;
 883 }
 884
 885 /*
 886  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 887  * (Parsing C++ Command-Line Arguments)
 888  */
 889 static const char *quote_arg(const char *arg)
 890 {
 891         /* count chars to quote */
 892         int len = 0, n = 0;
 893         int force_quotes = 0;
 894         char *q, *d;
 895         const char *p = arg;
 896         if (!*p) force_quotes = 1;
 897         while (*p) {
 898                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 899                         force_quotes = 1;
 900                 else if (*p == '"')
 901                         n++;
 902                 else if (*p == '\\') {
 903                         int count = 0;
 904                         while (*p == '\\') {
 905                                 count++;
 906                                 p++;
 907                                 len++;
 908                         }
 909                         if (*p == '"' || !*p)
 910                                 n += count*2 + 1;
 911                         continue;
 912                 }
 913                 len++;
 914                 p++;
 915         }
 916         if (!force_quotes && n == 0)
 917                 return arg;
 918
 919         /* insert \ where necessary */
 920         d = q = xmalloc(st_add3(len, n, 3));
 921         *d++ = '"';
 922         while (*arg) {
 923                 if (*arg == '"')
 924                         *d++ = '\\';
 925                 else if (*arg == '\\') {
 926                         int count = 0;
 927                         while (*arg == '\\') {
 928                                 count++;
 929                                 *d++ = *arg++;
 930                         }
 931                         if (*arg == '"' || !*arg) {
 932                                 while (count-- > 0)
 933                                         *d++ = '\\';
 934                                 /* don't escape the surrounding end quote */
 935                                 if (!*arg)
 936                                         break;
 937                                 *d++ = '\\';
 938                         }
 939                 }
 940                 *d++ = *arg++;
 941         }
 942         *d++ = '"';
 943         *d++ = '\0';
 944         return q;
 945 }
 946
 947 static const char *parse_interpreter(const char *cmd)
 948 {
 949         static char buf[100];
 950         char *p, *opt;
 951         int n, fd;
 952
 953         /* don't even try a .exe */
 954         n = strlen(cmd);
 955         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 956                 return NULL;
 957
 958         fd = open(cmd, O_RDONLY);
 959         if (fd < 0)
 960                 return NULL;
 961         n = read(fd, buf, sizeof(buf)-1);
 962         close(fd);
 963         if (n < 4)      /* at least '#!/x' and not error */
 964                 return NULL;
 965
 966         if (buf[0] != '#' || buf[1] != '!')
 967                 return NULL;
 968         buf[n] = '\0';
 969         p = buf + strcspn(buf, "\r\n");
 970         if (!*p)
 971                 return NULL;
 972
 973         *p = '\0';
 974         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 975                 return NULL;
 976         /* strip options */
 977         if ((opt = strchr(p+1, ' ')))
 978                 *opt = '\0';
 979         return p+1;
 980 }
 981
 982 /*
 983  * exe_only means that we only want to detect .exe files, but not scripts
 984  * (which do not have an extension)
 985  */
 986 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
 987                          int isexe, int exe_only)
 988 {
 989         char path[MAX_PATH];
 990         snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
 991
 992         if (!isexe && access(path, F_OK) == 0)
 993                 return xstrdup(path);
 994         path[strlen(path)-4] = '\0';
 995         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 996                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 997                         return xstrdup(path);
 998         return NULL;
 999 }
1000
1001 /*
1002  * Determines the absolute path of cmd using the split path in path.
1003  * If cmd contains a slash or backslash, no lookup is performed.
1004  */
1005 static char *path_lookup(const char *cmd, int exe_only)
1006 {
1007         const char *path;
1008         char *prog = NULL;
1009         int len = strlen(cmd);
1010         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1011
1012         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1013                 return xstrdup(cmd);
1014
1015         path = mingw_getenv("PATH");
1016         if (!path)
1017                 return NULL;
1018
1019         while (!prog) {
1020                 const char *sep = strchrnul(path, ';');
1021                 int dirlen = sep - path;
1022                 if (dirlen)
1023                         prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1024                 if (!*sep)
1025                         break;
1026                 path = sep + 1;
1027         }
1028
1029         return prog;
1030 }
1031
1032 static int do_putenv(char **env, const char *name, int size, int free_old);
1033
1034 /* used number of elements of environ array, including terminating NULL */
1035 static int environ_size = 0;
1036 /* allocated size of environ array, in bytes */
1037 static int environ_alloc = 0;
1038
1039 /*
1040  * Create environment block suitable for CreateProcess. Merges current
1041  * process environment and the supplied environment changes.
1042  */
1043 static wchar_t *make_environment_block(char **deltaenv)
1044 {
1045         wchar_t *wenvblk = NULL;
1046         char **tmpenv;
1047         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1048
1049         while (deltaenv && deltaenv[i])
1050                 i++;
1051
1052         /* copy the environment, leaving space for changes */
1053         ALLOC_ARRAY(tmpenv, size + i);
1054         memcpy(tmpenv, environ, size * sizeof(char*));
1055
1056         /* merge supplied environment changes into the temporary environment */
1057         for (i = 0; deltaenv && deltaenv[i]; i++)
1058                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1059
1060         /* create environment block from temporary environment */
1061         for (i = 0; tmpenv[i]; i++) {
1062                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1063                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1064                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1065         }
1066         /* add final \0 terminator */
1067         wenvblk[wenvpos] = 0;
1068         free(tmpenv);
1069         return wenvblk;
1070 }
1071
1072 struct pinfo_t {
1073         struct pinfo_t *next;
1074         pid_t pid;
1075         HANDLE proc;
1076 };
1077 static struct pinfo_t *pinfo = NULL;
1078 CRITICAL_SECTION pinfo_cs;
1079
1080 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1081                               const char *dir,
1082                               int prepend_cmd, int fhin, int fhout, int fherr)
1083 {
1084         STARTUPINFOW si;
1085         PROCESS_INFORMATION pi;
1086         struct strbuf args;
1087         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1088         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1089         BOOL ret;
1090
1091         /* Determine whether or not we are associated to a console */
1092         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1093                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1094                         FILE_ATTRIBUTE_NORMAL, NULL);
1095         if (cons == INVALID_HANDLE_VALUE) {
1096                 /* There is no console associated with this process.
1097                  * Since the child is a console process, Windows
1098                  * would normally create a console window. But
1099                  * since we'll be redirecting std streams, we do
1100                  * not need the console.
1101                  * It is necessary to use DETACHED_PROCESS
1102                  * instead of CREATE_NO_WINDOW to make ssh
1103                  * recognize that it has no console.
1104                  */
1105                 flags |= DETACHED_PROCESS;
1106         } else {
1107                 /* There is already a console. If we specified
1108                  * DETACHED_PROCESS here, too, Windows would
1109                  * disassociate the child from the console.
1110                  * The same is true for CREATE_NO_WINDOW.
1111                  * Go figure!
1112                  */
1113                 CloseHandle(cons);
1114         }
1115         memset(&si, 0, sizeof(si));
1116         si.cb = sizeof(si);
1117         si.dwFlags = STARTF_USESTDHANDLES;
1118         si.hStdInput = winansi_get_osfhandle(fhin);
1119         si.hStdOutput = winansi_get_osfhandle(fhout);
1120         si.hStdError = winansi_get_osfhandle(fherr);
1121
1122         if (xutftowcs_path(wcmd, cmd) < 0)
1123                 return -1;
1124         if (dir && xutftowcs_path(wdir, dir) < 0)
1125                 return -1;
1126
1127         /* concatenate argv, quoting args as we go */
1128         strbuf_init(&args, 0);
1129         if (prepend_cmd) {
1130                 char *quoted = (char *)quote_arg(cmd);
1131                 strbuf_addstr(&args, quoted);
1132                 if (quoted != cmd)
1133                         free(quoted);
1134         }
1135         for (; *argv; argv++) {
1136                 char *quoted = (char *)quote_arg(*argv);
1137                 if (*args.buf)
1138                         strbuf_addch(&args, ' ');
1139                 strbuf_addstr(&args, quoted);
1140                 if (quoted != *argv)
1141                         free(quoted);
1142         }
1143
1144         ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1145         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1146         strbuf_release(&args);
1147
1148         wenvblk = make_environment_block(deltaenv);
1149
1150         memset(&pi, 0, sizeof(pi));
1151         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1152                 wenvblk, dir ? wdir : NULL, &si, &pi);
1153
1154         free(wenvblk);
1155         free(wargs);
1156
1157         if (!ret) {
1158                 errno = ENOENT;
1159                 return -1;
1160         }
1161         CloseHandle(pi.hThread);
1162
1163         /*
1164          * The process ID is the human-readable identifier of the process
1165          * that we want to present in log and error messages. The handle
1166          * is not useful for this purpose. But we cannot close it, either,
1167          * because it is not possible to turn a process ID into a process
1168          * handle after the process terminated.
1169          * Keep the handle in a list for waitpid.
1170          */
1171         EnterCriticalSection(&pinfo_cs);
1172         {
1173                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1174                 info->pid = pi.dwProcessId;
1175                 info->proc = pi.hProcess;
1176                 info->next = pinfo;
1177                 pinfo = info;
1178         }
1179         LeaveCriticalSection(&pinfo_cs);
1180
1181         return (pid_t)pi.dwProcessId;
1182 }
1183
1184 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1185 {
1186         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1187 }
1188
1189 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1190                      const char *dir,
1191                      int fhin, int fhout, int fherr)
1192 {
1193         pid_t pid;
1194         char *prog = path_lookup(cmd, 0);
1195
1196         if (!prog) {
1197                 errno = ENOENT;
1198                 pid = -1;
1199         }
1200         else {
1201                 const char *interpr = parse_interpreter(prog);
1202
1203                 if (interpr) {
1204                         const char *argv0 = argv[0];
1205                         char *iprog = path_lookup(interpr, 1);
1206                         argv[0] = prog;
1207                         if (!iprog) {
1208                                 errno = ENOENT;
1209                                 pid = -1;
1210                         }
1211                         else {
1212                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1213                                                        fhin, fhout, fherr);
1214                                 free(iprog);
1215                         }
1216                         argv[0] = argv0;
1217                 }
1218                 else
1219                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1220                                                fhin, fhout, fherr);
1221                 free(prog);
1222         }
1223         return pid;
1224 }
1225
1226 static int try_shell_exec(const char *cmd, char *const *argv)
1227 {
1228         const char *interpr = parse_interpreter(cmd);
1229         char *prog;
1230         int pid = 0;
1231
1232         if (!interpr)
1233                 return 0;
1234         prog = path_lookup(interpr, 1);
1235         if (prog) {
1236                 int argc = 0;
1237                 const char **argv2;
1238                 while (argv[argc]) argc++;
1239                 ALLOC_ARRAY(argv2, argc + 1);
1240                 argv2[0] = (char *)cmd; /* full path to the script file */
1241                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1242                 pid = mingw_spawnv(prog, argv2, 1);
1243                 if (pid >= 0) {
1244                         int status;
1245                         if (waitpid(pid, &status, 0) < 0)
1246                                 status = 255;
1247                         exit(status);
1248                 }
1249                 pid = 1;        /* indicate that we tried but failed */
1250                 free(prog);
1251                 free(argv2);
1252         }
1253         return pid;
1254 }
1255
1256 int mingw_execv(const char *cmd, char *const *argv)
1257 {
1258         /* check if git_command is a shell script */
1259         if (!try_shell_exec(cmd, argv)) {
1260                 int pid, status;
1261
1262                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1263                 if (pid < 0)
1264                         return -1;
1265                 if (waitpid(pid, &status, 0) < 0)
1266                         status = 255;
1267                 exit(status);
1268         }
1269         return -1;
1270 }
1271
1272 int mingw_execvp(const char *cmd, char *const *argv)
1273 {
1274         char *prog = path_lookup(cmd, 0);
1275
1276         if (prog) {
1277                 mingw_execv(prog, argv);
1278                 free(prog);
1279         } else
1280                 errno = ENOENT;
1281
1282         return -1;
1283 }
1284
1285 int mingw_kill(pid_t pid, int sig)
1286 {
1287         if (pid > 0 && sig == SIGTERM) {
1288                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1289
1290                 if (TerminateProcess(h, -1)) {
1291                         CloseHandle(h);
1292                         return 0;
1293                 }
1294
1295                 errno = err_win_to_posix(GetLastError());
1296                 CloseHandle(h);
1297                 return -1;
1298         } else if (pid > 0 && sig == 0) {
1299                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1300                 if (h) {
1301                         CloseHandle(h);
1302                         return 0;
1303                 }
1304         }
1305
1306         errno = EINVAL;
1307         return -1;
1308 }
1309
1310 /*
1311  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1312  */
1313 static int compareenv(const void *v1, const void *v2)
1314 {
1315         const char *e1 = *(const char**)v1;
1316         const char *e2 = *(const char**)v2;
1317
1318         for (;;) {
1319                 int c1 = *e1++;
1320                 int c2 = *e2++;
1321                 c1 = (c1 == '=') ? 0 : tolower(c1);
1322                 c2 = (c2 == '=') ? 0 : tolower(c2);
1323                 if (c1 > c2)
1324                         return 1;
1325                 if (c1 < c2)
1326                         return -1;
1327                 if (c1 == 0)
1328                         return 0;
1329         }
1330 }
1331
1332 static int bsearchenv(char **env, const char *name, size_t size)
1333 {
1334         unsigned low = 0, high = size;
1335         while (low < high) {
1336                 unsigned mid = low + ((high - low) >> 1);
1337                 int cmp = compareenv(&env[mid], &name);
1338                 if (cmp < 0)
1339                         low = mid + 1;
1340                 else if (cmp > 0)
1341                         high = mid;
1342                 else
1343                         return mid;
1344         }
1345         return ~low; /* not found, return 1's complement of insert position */
1346 }
1347
1348 /*
1349  * If name contains '=', then sets the variable, otherwise it unsets it
1350  * Size includes the terminating NULL. Env must have room for size + 1 entries
1351  * (in case of insert). Returns the new size. Optionally frees removed entries.
1352  */
1353 static int do_putenv(char **env, const char *name, int size, int free_old)
1354 {
1355         int i = bsearchenv(env, name, size - 1);
1356
1357         /* optionally free removed / replaced entry */
1358         if (i >= 0 && free_old)
1359                 free(env[i]);
1360
1361         if (strchr(name, '=')) {
1362                 /* if new value ('key=value') is specified, insert or replace entry */
1363                 if (i < 0) {
1364                         i = ~i;
1365                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1366                         size++;
1367                 }
1368                 env[i] = (char*) name;
1369         } else if (i >= 0) {
1370                 /* otherwise ('key') remove existing entry */
1371                 size--;
1372                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1373         }
1374         return size;
1375 }
1376
1377 char *mingw_getenv(const char *name)
1378 {
1379         char *value;
1380         int pos = bsearchenv(environ, name, environ_size - 1);
1381         if (pos < 0)
1382                 return NULL;
1383         value = strchr(environ[pos], '=');
1384         return value ? &value[1] : NULL;
1385 }
1386
1387 int mingw_putenv(const char *namevalue)
1388 {
1389         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1390         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1391         return 0;
1392 }
1393
1394 /*
1395  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1396  * that service contains a numerical port, or that it is null. It
1397  * does a simple search using gethostbyname, and returns one IPv4 host
1398  * if one was found.
1399  */
1400 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1401                                    const struct addrinfo *hints,
1402                                    struct addrinfo **res)
1403 {
1404         struct hostent *h = NULL;
1405         struct addrinfo *ai;
1406         struct sockaddr_in *sin;
1407
1408         if (node) {
1409                 h = gethostbyname(node);
1410                 if (!h)
1411                         return WSAGetLastError();
1412         }
1413
1414         ai = xmalloc(sizeof(struct addrinfo));
1415         *res = ai;
1416         ai->ai_flags = 0;
1417         ai->ai_family = AF_INET;
1418         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1419         switch (ai->ai_socktype) {
1420         case SOCK_STREAM:
1421                 ai->ai_protocol = IPPROTO_TCP;
1422                 break;
1423         case SOCK_DGRAM:
1424                 ai->ai_protocol = IPPROTO_UDP;
1425                 break;
1426         default:
1427                 ai->ai_protocol = 0;
1428                 break;
1429         }
1430         ai->ai_addrlen = sizeof(struct sockaddr_in);
1431         if (hints && (hints->ai_flags & AI_CANONNAME))
1432                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1433         else
1434                 ai->ai_canonname = NULL;
1435
1436         sin = xcalloc(1, ai->ai_addrlen);
1437         sin->sin_family = AF_INET;
1438         /* Note: getaddrinfo is supposed to allow service to be a string,
1439          * which should be looked up using getservbyname. This is
1440          * currently not implemented */
1441         if (service)
1442                 sin->sin_port = htons(atoi(service));
1443         if (h)
1444                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1445         else if (hints && (hints->ai_flags & AI_PASSIVE))
1446                 sin->sin_addr.s_addr = INADDR_ANY;
1447         else
1448                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1449         ai->ai_addr = (struct sockaddr *)sin;
1450         ai->ai_next = NULL;
1451         return 0;
1452 }
1453
1454 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1455 {
1456         free(res->ai_canonname);
1457         free(res->ai_addr);
1458         free(res);
1459 }
1460
1461 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1462                                    char *host, DWORD hostlen,
1463                                    char *serv, DWORD servlen, int flags)
1464 {
1465         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1466         if (sa->sa_family != AF_INET)
1467                 return EAI_FAMILY;
1468         if (!host && !serv)
1469                 return EAI_NONAME;
1470
1471         if (host && hostlen > 0) {
1472                 struct hostent *ent = NULL;
1473                 if (!(flags & NI_NUMERICHOST))
1474                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1475                                             sizeof(sin->sin_addr), AF_INET);
1476
1477                 if (ent)
1478                         snprintf(host, hostlen, "%s", ent->h_name);
1479                 else if (flags & NI_NAMEREQD)
1480                         return EAI_NONAME;
1481                 else
1482                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1483         }
1484
1485         if (serv && servlen > 0) {
1486                 struct servent *ent = NULL;
1487                 if (!(flags & NI_NUMERICSERV))
1488                         ent = getservbyport(sin->sin_port,
1489                                             flags & NI_DGRAM ? "udp" : "tcp");
1490
1491                 if (ent)
1492                         snprintf(serv, servlen, "%s", ent->s_name);
1493                 else
1494                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1495         }
1496
1497         return 0;
1498 }
1499
1500 static HMODULE ipv6_dll = NULL;
1501 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1502 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1503                                       const struct addrinfo *hints,
1504                                       struct addrinfo **res);
1505 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1506                                       char *host, DWORD hostlen,
1507                                       char *serv, DWORD servlen, int flags);
1508 /*
1509  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1510  * don't need to try to load that one dynamically.
1511  */
1512
1513 static void socket_cleanup(void)
1514 {
1515         WSACleanup();
1516         if (ipv6_dll)
1517                 FreeLibrary(ipv6_dll);
1518         ipv6_dll = NULL;
1519         ipv6_freeaddrinfo = freeaddrinfo_stub;
1520         ipv6_getaddrinfo = getaddrinfo_stub;
1521         ipv6_getnameinfo = getnameinfo_stub;
1522 }
1523
1524 static void ensure_socket_initialization(void)
1525 {
1526         WSADATA wsa;
1527         static int initialized = 0;
1528         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1529         const char **name;
1530
1531         if (initialized)
1532                 return;
1533
1534         if (WSAStartup(MAKEWORD(2,2), &wsa))
1535                 die("unable to initialize winsock subsystem, error %d",
1536                         WSAGetLastError());
1537
1538         for (name = libraries; *name; name++) {
1539                 ipv6_dll = LoadLibrary(*name);
1540                 if (!ipv6_dll)
1541                         continue;
1542
1543                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1544                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1545                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1546                                                    const struct addrinfo *,
1547                                                    struct addrinfo **))
1548                         GetProcAddress(ipv6_dll, "getaddrinfo");
1549                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1550                                                    socklen_t, char *, DWORD,
1551                                                    char *, DWORD, int))
1552                         GetProcAddress(ipv6_dll, "getnameinfo");
1553                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1554                         FreeLibrary(ipv6_dll);
1555                         ipv6_dll = NULL;
1556                 } else
1557                         break;
1558         }
1559         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1560                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1561                 ipv6_getaddrinfo = getaddrinfo_stub;
1562                 ipv6_getnameinfo = getnameinfo_stub;
1563         }
1564
1565         atexit(socket_cleanup);
1566         initialized = 1;
1567 }
1568
1569 #undef gethostname
1570 int mingw_gethostname(char *name, int namelen)
1571 {
1572     ensure_socket_initialization();
1573     return gethostname(name, namelen);
1574 }
1575
1576 #undef gethostbyname
1577 struct hostent *mingw_gethostbyname(const char *host)
1578 {
1579         ensure_socket_initialization();
1580         return gethostbyname(host);
1581 }
1582
1583 void mingw_freeaddrinfo(struct addrinfo *res)
1584 {
1585         ipv6_freeaddrinfo(res);
1586 }
1587
1588 int mingw_getaddrinfo(const char *node, const char *service,
1589                       const struct addrinfo *hints, struct addrinfo **res)
1590 {
1591         ensure_socket_initialization();
1592         return ipv6_getaddrinfo(node, service, hints, res);
1593 }
1594
1595 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1596                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1597                       int flags)
1598 {
1599         ensure_socket_initialization();
1600         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1601 }
1602
1603 int mingw_socket(int domain, int type, int protocol)
1604 {
1605         int sockfd;
1606         SOCKET s;
1607
1608         ensure_socket_initialization();
1609         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1610         if (s == INVALID_SOCKET) {
1611                 /*
1612                  * WSAGetLastError() values are regular BSD error codes
1613                  * biased by WSABASEERR.
1614                  * However, strerror() does not know about networking
1615                  * specific errors, which are values beginning at 38 or so.
1616                  * Therefore, we choose to leave the biased error code
1617                  * in errno so that _if_ someone looks up the code somewhere,
1618                  * then it is at least the number that are usually listed.
1619                  */
1620                 errno = WSAGetLastError();
1621                 return -1;
1622         }
1623         /* convert into a file descriptor */
1624         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1625                 closesocket(s);
1626                 return error("unable to make a socket file descriptor: %s",
1627                         strerror(errno));
1628         }
1629         return sockfd;
1630 }
1631
1632 #undef connect
1633 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1634 {
1635         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1636         return connect(s, sa, sz);
1637 }
1638
1639 #undef bind
1640 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1641 {
1642         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1643         return bind(s, sa, sz);
1644 }
1645
1646 #undef setsockopt
1647 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1648 {
1649         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1650         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1651 }
1652
1653 #undef shutdown
1654 int mingw_shutdown(int sockfd, int how)
1655 {
1656         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1657         return shutdown(s, how);
1658 }
1659
1660 #undef listen
1661 int mingw_listen(int sockfd, int backlog)
1662 {
1663         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1664         return listen(s, backlog);
1665 }
1666
1667 #undef accept
1668 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1669 {
1670         int sockfd2;
1671
1672         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1673         SOCKET s2 = accept(s1, sa, sz);
1674
1675         /* convert into a file descriptor */
1676         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1677                 int err = errno;
1678                 closesocket(s2);
1679                 return error("unable to make a socket file descriptor: %s",
1680                         strerror(err));
1681         }
1682         return sockfd2;
1683 }
1684
1685 #undef rename
1686 int mingw_rename(const char *pold, const char *pnew)
1687 {
1688         DWORD attrs, gle;
1689         int tries = 0;
1690         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1691         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1692                 return -1;
1693
1694         /*
1695          * Try native rename() first to get errno right.
1696          * It is based on MoveFile(), which cannot overwrite existing files.
1697          */
1698         if (!_wrename(wpold, wpnew))
1699                 return 0;
1700         if (errno != EEXIST)
1701                 return -1;
1702 repeat:
1703         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1704                 return 0;
1705         /* TODO: translate more errors */
1706         gle = GetLastError();
1707         if (gle == ERROR_ACCESS_DENIED &&
1708             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1709                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1710                         DWORD attrsold = GetFileAttributesW(wpold);
1711                         if (attrsold == INVALID_FILE_ATTRIBUTES ||
1712                             !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1713                                 errno = EISDIR;
1714                         else if (!_wrmdir(wpnew))
1715                                 goto repeat;
1716                         return -1;
1717                 }
1718                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1719                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1720                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1721                                 return 0;
1722                         gle = GetLastError();
1723                         /* revert file attributes on failure */
1724                         SetFileAttributesW(wpnew, attrs);
1725                 }
1726         }
1727         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1728                 /*
1729                  * We assume that some other process had the source or
1730                  * destination file open at the wrong moment and retry.
1731                  * In order to give the other process a higher chance to
1732                  * complete its operation, we give up our time slice now.
1733                  * If we have to retry again, we do sleep a bit.
1734                  */
1735                 Sleep(delay[tries]);
1736                 tries++;
1737                 goto repeat;
1738         }
1739         if (gle == ERROR_ACCESS_DENIED &&
1740                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1741                        "Should I try again?", pold, pnew))
1742                 goto repeat;
1743
1744         errno = EACCES;
1745         return -1;
1746 }
1747
1748 /*
1749  * Note that this doesn't return the actual pagesize, but
1750  * the allocation granularity. If future Windows specific git code
1751  * needs the real getpagesize function, we need to find another solution.
1752  */
1753 int mingw_getpagesize(void)
1754 {
1755         SYSTEM_INFO si;
1756         GetSystemInfo(&si);
1757         return si.dwAllocationGranularity;
1758 }
1759
1760 struct passwd *getpwuid(int uid)
1761 {
1762         static char user_name[100];
1763         static struct passwd p;
1764
1765         DWORD len = sizeof(user_name);
1766         if (!GetUserName(user_name, &len))
1767                 return NULL;
1768         p.pw_name = user_name;
1769         p.pw_gecos = "unknown";
1770         p.pw_dir = NULL;
1771         return &p;
1772 }
1773
1774 static HANDLE timer_event;
1775 static HANDLE timer_thread;
1776 static int timer_interval;
1777 static int one_shot;
1778 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1779
1780 /* The timer works like this:
1781  * The thread, ticktack(), is a trivial routine that most of the time
1782  * only waits to receive the signal to terminate. The main thread tells
1783  * the thread to terminate by setting the timer_event to the signalled
1784  * state.
1785  * But ticktack() interrupts the wait state after the timer's interval
1786  * length to call the signal handler.
1787  */
1788
1789 static unsigned __stdcall ticktack(void *dummy)
1790 {
1791         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1792                 mingw_raise(SIGALRM);
1793                 if (one_shot)
1794                         break;
1795         }
1796         return 0;
1797 }
1798
1799 static int start_timer_thread(void)
1800 {
1801         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1802         if (timer_event) {
1803                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1804                 if (!timer_thread )
1805                         return errno = ENOMEM,
1806                                 error("cannot start timer thread");
1807         } else
1808                 return errno = ENOMEM,
1809                         error("cannot allocate resources for timer");
1810         return 0;
1811 }
1812
1813 static void stop_timer_thread(void)
1814 {
1815         if (timer_event)
1816                 SetEvent(timer_event);  /* tell thread to terminate */
1817         if (timer_thread) {
1818                 int rc = WaitForSingleObject(timer_thread, 1000);
1819                 if (rc == WAIT_TIMEOUT)
1820                         error("timer thread did not terminate timely");
1821                 else if (rc != WAIT_OBJECT_0)
1822                         error("waiting for timer thread failed: %lu",
1823                               GetLastError());
1824                 CloseHandle(timer_thread);
1825         }
1826         if (timer_event)
1827                 CloseHandle(timer_event);
1828         timer_event = NULL;
1829         timer_thread = NULL;
1830 }
1831
1832 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1833 {
1834         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1835 }
1836
1837 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1838 {
1839         static const struct timeval zero;
1840         static int atexit_done;
1841
1842         if (out != NULL)
1843                 return errno = EINVAL,
1844                         error("setitimer param 3 != NULL not implemented");
1845         if (!is_timeval_eq(&in->it_interval, &zero) &&
1846             !is_timeval_eq(&in->it_interval, &in->it_value))
1847                 return errno = EINVAL,
1848                         error("setitimer: it_interval must be zero or eq it_value");
1849
1850         if (timer_thread)
1851                 stop_timer_thread();
1852
1853         if (is_timeval_eq(&in->it_value, &zero) &&
1854             is_timeval_eq(&in->it_interval, &zero))
1855                 return 0;
1856
1857         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1858         one_shot = is_timeval_eq(&in->it_interval, &zero);
1859         if (!atexit_done) {
1860                 atexit(stop_timer_thread);
1861                 atexit_done = 1;
1862         }
1863         return start_timer_thread();
1864 }
1865
1866 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1867 {
1868         if (sig != SIGALRM)
1869                 return errno = EINVAL,
1870                         error("sigaction only implemented for SIGALRM");
1871         if (out != NULL)
1872                 return errno = EINVAL,
1873                         error("sigaction: param 3 != NULL not implemented");
1874
1875         timer_fn = in->sa_handler;
1876         return 0;
1877 }
1878
1879 #undef signal
1880 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1881 {
1882         sig_handler_t old;
1883
1884         switch (sig) {
1885         case SIGALRM:
1886                 old = timer_fn;
1887                 timer_fn = handler;
1888                 break;
1889
1890         case SIGINT:
1891                 old = sigint_fn;
1892                 sigint_fn = handler;
1893                 break;
1894
1895         default:
1896                 return signal(sig, handler);
1897         }
1898
1899         return old;
1900 }
1901
1902 #undef raise
1903 int mingw_raise(int sig)
1904 {
1905         switch (sig) {
1906         case SIGALRM:
1907                 if (timer_fn == SIG_DFL) {
1908                         if (isatty(STDERR_FILENO))
1909                                 fputs("Alarm clock\n", stderr);
1910                         exit(128 + SIGALRM);
1911                 } else if (timer_fn != SIG_IGN)
1912                         timer_fn(SIGALRM);
1913                 return 0;
1914
1915         case SIGINT:
1916                 if (sigint_fn == SIG_DFL)
1917                         exit(128 + SIGINT);
1918                 else if (sigint_fn != SIG_IGN)
1919                         sigint_fn(SIGINT);
1920                 return 0;
1921
1922         default:
1923                 return raise(sig);
1924         }
1925 }
1926
1927 int link(const char *oldpath, const char *newpath)
1928 {
1929         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1930         static T create_hard_link = NULL;
1931         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1932         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1933                 xutftowcs_path(wnewpath, newpath) < 0)
1934                 return -1;
1935
1936         if (!create_hard_link) {
1937                 create_hard_link = (T) GetProcAddress(
1938                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1939                 if (!create_hard_link)
1940                         create_hard_link = (T)-1;
1941         }
1942         if (create_hard_link == (T)-1) {
1943                 errno = ENOSYS;
1944                 return -1;
1945         }
1946         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1947                 errno = err_win_to_posix(GetLastError());
1948                 return -1;
1949         }
1950         return 0;
1951 }
1952
1953 pid_t waitpid(pid_t pid, int *status, int options)
1954 {
1955         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1956             FALSE, pid);
1957         if (!h) {
1958                 errno = ECHILD;
1959                 return -1;
1960         }
1961
1962         if (pid > 0 && options & WNOHANG) {
1963                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1964                         CloseHandle(h);
1965                         return 0;
1966                 }
1967                 options &= ~WNOHANG;
1968         }
1969
1970         if (options == 0) {
1971                 struct pinfo_t **ppinfo;
1972                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1973                         CloseHandle(h);
1974                         return 0;
1975                 }
1976
1977                 if (status)
1978                         GetExitCodeProcess(h, (LPDWORD)status);
1979
1980                 EnterCriticalSection(&pinfo_cs);
1981
1982                 ppinfo = &pinfo;
1983                 while (*ppinfo) {
1984                         struct pinfo_t *info = *ppinfo;
1985                         if (info->pid == pid) {
1986                                 CloseHandle(info->proc);
1987                                 *ppinfo = info->next;
1988                                 free(info);
1989                                 break;
1990                         }
1991                         ppinfo = &info->next;
1992                 }
1993
1994                 LeaveCriticalSection(&pinfo_cs);
1995
1996                 CloseHandle(h);
1997                 return pid;
1998         }
1999         CloseHandle(h);
2000
2001         errno = EINVAL;
2002         return -1;
2003 }
2004
2005 int mingw_has_dos_drive_prefix(const char *path)
2006 {
2007         int i;
2008
2009         /*
2010          * Does it start with an ASCII letter (i.e. highest bit not set),
2011          * followed by a colon?
2012          */
2013         if (!(0x80 & (unsigned char)*path))
2014                 return *path && path[1] == ':' ? 2 : 0;
2015
2016         /*
2017          * While drive letters must be letters of the English alphabet, it is
2018          * possible to assign virtually _any_ Unicode character via `subst` as
2019          * a drive letter to "virtual drives". Even `1`, or `ä`. Or fun stuff
2020          * like this:
2021          *
2022          *      subst ֍: %USERPROFILE%\Desktop
2023          */
2024         for (i = 1; i < 4 && (0x80 & (unsigned char)path[i]); i++)
2025                 ; /* skip first UTF-8 character */
2026         return path[i] == ':' ? i + 1 : 0;
2027 }
2028
2029 int mingw_skip_dos_drive_prefix(char **path)
2030 {
2031         int ret = has_dos_drive_prefix(*path);
2032         *path += ret;
2033         return ret;
2034 }
2035
2036 int mingw_offset_1st_component(const char *path)
2037 {
2038         char *pos = (char *)path;
2039
2040         /* unc paths */
2041         if (!skip_dos_drive_prefix(&pos) &&
2042                         is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2043                 /* skip server name */
2044                 pos = strpbrk(pos + 2, "\\/");
2045                 if (!pos)
2046                         return 0; /* Error: malformed unc path */
2047
2048                 do {
2049                         pos++;
2050                 } while (*pos && !is_dir_sep(*pos));
2051         }
2052
2053         return pos + is_dir_sep(*pos) - path;
2054 }
2055
2056 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2057 {
2058         int upos = 0, wpos = 0;
2059         const unsigned char *utf = (const unsigned char*) utfs;
2060         if (!utf || !wcs || wcslen < 1) {
2061                 errno = EINVAL;
2062                 return -1;
2063         }
2064         /* reserve space for \0 */
2065         wcslen--;
2066         if (utflen < 0)
2067                 utflen = INT_MAX;
2068
2069         while (upos < utflen) {
2070                 int c = utf[upos++] & 0xff;
2071                 if (utflen == INT_MAX && c == 0)
2072                         break;
2073
2074                 if (wpos >= wcslen) {
2075                         wcs[wpos] = 0;
2076                         errno = ERANGE;
2077                         return -1;
2078                 }
2079
2080                 if (c < 0x80) {
2081                         /* ASCII */
2082                         wcs[wpos++] = c;
2083                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2084                                 (utf[upos] & 0xc0) == 0x80) {
2085                         /* 2-byte utf-8 */
2086                         c = ((c & 0x1f) << 6);
2087                         c |= (utf[upos++] & 0x3f);
2088                         wcs[wpos++] = c;
2089                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2090                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2091                                 (utf[upos] & 0xc0) == 0x80 &&
2092                                 (utf[upos + 1] & 0xc0) == 0x80) {
2093                         /* 3-byte utf-8 */
2094                         c = ((c & 0x0f) << 12);
2095                         c |= ((utf[upos++] & 0x3f) << 6);
2096                         c |= (utf[upos++] & 0x3f);
2097                         wcs[wpos++] = c;
2098                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2099                                 wpos + 1 < wcslen &&
2100                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2101                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2102                                 (utf[upos] & 0xc0) == 0x80 &&
2103                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2104                                 (utf[upos + 2] & 0xc0) == 0x80) {
2105                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2106                         c = ((c & 0x07) << 18);
2107                         c |= ((utf[upos++] & 0x3f) << 12);
2108                         c |= ((utf[upos++] & 0x3f) << 6);
2109                         c |= (utf[upos++] & 0x3f);
2110                         c -= 0x10000;
2111                         wcs[wpos++] = 0xd800 | (c >> 10);
2112                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2113                 } else if (c >= 0xa0) {
2114                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2115                         wcs[wpos++] = c;
2116                 } else {
2117                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2118                         static const char *hex = "0123456789abcdef";
2119                         wcs[wpos++] = hex[c >> 4];
2120                         if (wpos < wcslen)
2121                                 wcs[wpos++] = hex[c & 0x0f];
2122                 }
2123         }
2124         wcs[wpos] = 0;
2125         return wpos;
2126 }
2127
2128 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2129 {
2130         if (!wcs || !utf || utflen < 1) {
2131                 errno = EINVAL;
2132                 return -1;
2133         }
2134         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2135         if (utflen)
2136                 return utflen - 1;
2137         errno = ERANGE;
2138         return -1;
2139 }
2140
2141 static void setup_windows_environment(void)
2142 {
2143         char *tmp = getenv("TMPDIR");
2144
2145         /* on Windows it is TMP and TEMP */
2146         if (!tmp) {
2147                 if (!(tmp = getenv("TMP")))
2148                         tmp = getenv("TEMP");
2149                 if (tmp) {
2150                         setenv("TMPDIR", tmp, 1);
2151                         tmp = getenv("TMPDIR");
2152                 }
2153         }
2154
2155         if (tmp) {
2156                 /*
2157                  * Convert all dir separators to forward slashes,
2158                  * to help shell commands called from the Git
2159                  * executable (by not mistaking the dir separators
2160                  * for escape characters).
2161                  */
2162                 convert_slashes(tmp);
2163         }
2164
2165         /* simulate TERM to enable auto-color (see color.c) */
2166         if (!getenv("TERM"))
2167                 setenv("TERM", "cygwin", 1);
2168 }
2169
2170 int is_valid_win32_path(const char *path)
2171 {
2172         int preceding_space_or_period = 0, i = 0, periods = 0;
2173
2174         if (!protect_ntfs)
2175                 return 1;
2176
2177         skip_dos_drive_prefix((char **)&path);
2178
2179         for (;;) {
2180                 char c = *(path++);
2181                 switch (c) {
2182                 case '\0':
2183                 case '/': case '\\':
2184                         /* cannot end in ` ` or `.`, except for `.` and `..` */
2185                         if (preceding_space_or_period &&
2186                             (i != periods || periods > 2))
2187                                 return 0;
2188                         if (!c)
2189                                 return 1;
2190
2191                         i = periods = preceding_space_or_period = 0;
2192                         continue;
2193                 case '.':
2194                         periods++;
2195                         /* fallthru */
2196                 case ' ':
2197                         preceding_space_or_period = 1;
2198                         i++;
2199                         continue;
2200                 case ':': /* DOS drive prefix was already skipped */
2201                 case '<': case '>': case '"': case '|': case '?': case '*':
2202                         /* illegal character */
2203                         return 0;
2204                 default:
2205                         if (c > '\0' && c < '\x20')
2206                                 /* illegal character */
2207                                 return 0;
2208                 }
2209                 preceding_space_or_period = 0;
2210                 i++;
2211         }
2212 }
2213
2214 /*
2215  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2216  * mingw startup code, see init.c in mingw runtime).
2217  */
2218 int _CRT_glob = 0;
2219
2220 typedef struct {
2221         int newmode;
2222 } _startupinfo;
2223
2224 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2225                 _startupinfo *si);
2226
2227 static NORETURN void die_startup(void)
2228 {
2229         fputs("fatal: not enough memory for initialization", stderr);
2230         exit(128);
2231 }
2232
2233 static void *malloc_startup(size_t size)
2234 {
2235         void *result = malloc(size);
2236         if (!result)
2237                 die_startup();
2238         return result;
2239 }
2240
2241 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2242 {
2243         len = xwcstoutf(buffer, wcs, len) + 1;
2244         return memcpy(malloc_startup(len), buffer, len);
2245 }
2246
2247 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2248                                       DWORD desired_access, DWORD flags)
2249 {
2250         DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2251         wchar_t buf[MAX_PATH];
2252         DWORD max = ARRAY_SIZE(buf);
2253         HANDLE handle;
2254         DWORD ret = GetEnvironmentVariableW(key, buf, max);
2255
2256         if (!ret || ret >= max)
2257                 return;
2258
2259         /* make sure this does not leak into child processes */
2260         SetEnvironmentVariableW(key, NULL);
2261         if (!wcscmp(buf, L"off")) {
2262                 close(fd);
2263                 handle = GetStdHandle(std_id);
2264                 if (handle != INVALID_HANDLE_VALUE)
2265                         CloseHandle(handle);
2266                 return;
2267         }
2268         if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2269                 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2270                 if (handle == INVALID_HANDLE_VALUE) {
2271                         close(fd);
2272                         handle = GetStdHandle(std_id);
2273                         if (handle != INVALID_HANDLE_VALUE)
2274                                 CloseHandle(handle);
2275                 } else {
2276                         int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2277                         SetStdHandle(std_id, handle);
2278                         dup2(new_fd, fd);
2279                         /* do *not* close the new_fd: that would close stdout */
2280                 }
2281                 return;
2282         }
2283         handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2284                              flags, NULL);
2285         if (handle != INVALID_HANDLE_VALUE) {
2286                 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2287                 SetStdHandle(std_id, handle);
2288                 dup2(new_fd, fd);
2289                 close(new_fd);
2290         }
2291 }
2292
2293 static void maybe_redirect_std_handles(void)
2294 {
2295         maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2296                                   GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2297         maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2298                                   GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2299         maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2300                                   GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2301 }
2302
2303 void mingw_startup(void)
2304 {
2305         int i, maxlen, argc;
2306         char *buffer;
2307         wchar_t **wenv, **wargv;
2308         _startupinfo si;
2309
2310         maybe_redirect_std_handles();
2311
2312         /* get wide char arguments and environment */
2313         si.newmode = 0;
2314         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2315                 die_startup();
2316
2317         /* determine size of argv and environ conversion buffer */
2318         maxlen = wcslen(wargv[0]);
2319         for (i = 1; i < argc; i++)
2320                 maxlen = max(maxlen, wcslen(wargv[i]));
2321         for (i = 0; wenv[i]; i++)
2322                 maxlen = max(maxlen, wcslen(wenv[i]));
2323
2324         /*
2325          * nedmalloc can't free CRT memory, allocate resizable environment
2326          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2327          * use it while initializing the environment itself.
2328          */
2329         environ_size = i + 1;
2330         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2331         environ = malloc_startup(environ_alloc);
2332
2333         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2334         maxlen = 3 * maxlen + 1;
2335         buffer = malloc_startup(maxlen);
2336
2337         /* convert command line arguments and environment to UTF-8 */
2338         for (i = 0; i < argc; i++)
2339                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2340         for (i = 0; wenv[i]; i++)
2341                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2342         environ[i] = NULL;
2343         free(buffer);
2344
2345         /* sort environment for O(log n) getenv / putenv */
2346         qsort(environ, i, sizeof(char*), compareenv);
2347
2348         /* fix Windows specific environment settings */
2349         setup_windows_environment();
2350
2351         /* initialize critical section for waitpid pinfo_t list */
2352         InitializeCriticalSection(&pinfo_cs);
2353
2354         /* set up default file mode and file modes for stdin/out/err */
2355         _fmode = _O_BINARY;
2356         _setmode(_fileno(stdin), _O_BINARY);
2357         _setmode(_fileno(stdout), _O_BINARY);
2358         _setmode(_fileno(stderr), _O_BINARY);
2359
2360         /* initialize Unicode console */
2361         winansi_init();
2362 }
2363
2364 int uname(struct utsname *buf)
2365 {
2366         unsigned v = (unsigned)GetVersion();
2367         memset(buf, 0, sizeof(*buf));
2368         xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2369         xsnprintf(buf->release, sizeof(buf->release),
2370                  "%u.%u", v & 0xff, (v >> 8) & 0xff);
2371         /* assuming NT variants only.. */
2372         xsnprintf(buf->version, sizeof(buf->version),
2373                   "%u", (v >> 16) & 0x7fff);
2374         return 0;
2375 }