gdb/remote-fileio.c

   1 /* Remote File-I/O communications
   2
   3    Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 /* See the GDB User Guide for details of the GDB remote protocol. */
  23
  24 #include "defs.h"
  25 #include "gdb_string.h"
  26 #include "gdbcmd.h"
  27 #include "remote.h"
  28 #include "gdb/fileio.h"
  29 #include "gdb_wait.h"
  30 #include "gdb_stat.h"
  31 #include "exceptions.h"
  32 #include "remote-fileio.h"
  33
  34 #include <fcntl.h>
  35 #include <sys/time.h>
  36 #ifdef __CYGWIN__
  37 #include <sys/cygwin.h>         /* For cygwin_conv_to_full_posix_path.  */
  38 #endif
  39 #include <signal.h>
  40
  41 static struct {
  42   int *fd_map;
  43   int fd_map_size;
  44 } remote_fio_data;
  45
  46 #define FIO_FD_INVALID          -1
  47 #define FIO_FD_CONSOLE_IN       -2
  48 #define FIO_FD_CONSOLE_OUT      -3
  49
  50 static int remote_fio_system_call_allowed = 0;
  51
  52 static int
  53 remote_fileio_init_fd_map (void)
  54 {
  55   int i;
  56
  57   if (!remote_fio_data.fd_map)
  58     {
  59       remote_fio_data.fd_map = (int *) xmalloc (10 * sizeof (int));
  60       remote_fio_data.fd_map_size = 10;
  61       remote_fio_data.fd_map[0] = FIO_FD_CONSOLE_IN;
  62       remote_fio_data.fd_map[1] = FIO_FD_CONSOLE_OUT;
  63       remote_fio_data.fd_map[2] = FIO_FD_CONSOLE_OUT;
  64       for (i = 3; i < 10; ++i)
  65         remote_fio_data.fd_map[i] = FIO_FD_INVALID;
  66     }
  67   return 3;
  68 }
  69
  70 static int
  71 remote_fileio_resize_fd_map (void)
  72 {
  73   if (!remote_fio_data.fd_map)
  74     return remote_fileio_init_fd_map ();
  75   remote_fio_data.fd_map_size += 10;
  76   remote_fio_data.fd_map =
  77     (int *) xrealloc (remote_fio_data.fd_map,
  78                       remote_fio_data.fd_map_size * sizeof (int));
  79   return remote_fio_data.fd_map_size - 10;
  80 }
  81
  82 static int
  83 remote_fileio_next_free_fd (void)
  84 {
  85   int i;
  86
  87   for (i = 0; i < remote_fio_data.fd_map_size; ++i)
  88     if (remote_fio_data.fd_map[i] == FIO_FD_INVALID)
  89       return i;
  90   return remote_fileio_resize_fd_map ();
  91 }
  92
  93 static int
  94 remote_fileio_fd_to_targetfd (int fd)
  95 {
  96   int target_fd = remote_fileio_next_free_fd ();
  97   remote_fio_data.fd_map[target_fd] = fd;
  98   return target_fd;
  99 }
 100
 101 static int
 102 remote_fileio_map_fd (int target_fd)
 103 {
 104   remote_fileio_init_fd_map ();
 105   if (target_fd < 0 || target_fd >= remote_fio_data.fd_map_size)
 106     return FIO_FD_INVALID;
 107   return remote_fio_data.fd_map[target_fd];
 108 }
 109
 110 static void
 111 remote_fileio_close_target_fd (int target_fd)
 112 {
 113   remote_fileio_init_fd_map ();
 114   if (target_fd >= 0 && target_fd < remote_fio_data.fd_map_size)
 115     remote_fio_data.fd_map[target_fd] = FIO_FD_INVALID;
 116 }
 117
 118 static int
 119 remote_fileio_oflags_to_host (long flags)
 120 {
 121   int hflags = 0;
 122
 123   if (flags & FILEIO_O_CREAT)
 124     hflags |= O_CREAT;
 125   if (flags & FILEIO_O_EXCL)
 126     hflags |= O_EXCL;
 127   if (flags & FILEIO_O_TRUNC)
 128     hflags |= O_TRUNC;
 129   if (flags & FILEIO_O_APPEND)
 130     hflags |= O_APPEND;
 131   if (flags & FILEIO_O_RDONLY)
 132     hflags |= O_RDONLY;
 133   if (flags & FILEIO_O_WRONLY)
 134     hflags |= O_WRONLY;
 135   if (flags & FILEIO_O_RDWR)
 136     hflags |= O_RDWR;
 137 /* On systems supporting binary and text mode, always open files in
 138    binary mode. */
 139 #ifdef O_BINARY
 140   hflags |= O_BINARY;
 141 #endif
 142   return hflags;
 143 }
 144
 145 static mode_t
 146 remote_fileio_mode_to_host (long mode, int open_call)
 147 {
 148   mode_t hmode = 0;
 149
 150   if (!open_call)
 151     {
 152       if (mode & FILEIO_S_IFREG)
 153         hmode |= S_IFREG;
 154       if (mode & FILEIO_S_IFDIR)
 155         hmode |= S_IFDIR;
 156       if (mode & FILEIO_S_IFCHR)
 157         hmode |= S_IFCHR;
 158     }
 159   if (mode & FILEIO_S_IRUSR)
 160     hmode |= S_IRUSR;
 161   if (mode & FILEIO_S_IWUSR)
 162     hmode |= S_IWUSR;
 163   if (mode & FILEIO_S_IXUSR)
 164     hmode |= S_IXUSR;
 165 #ifdef S_IRGRP
 166   if (mode & FILEIO_S_IRGRP)
 167     hmode |= S_IRGRP;
 168 #endif
 169 #ifdef S_IWGRP
 170   if (mode & FILEIO_S_IWGRP)
 171     hmode |= S_IWGRP;
 172 #endif
 173 #ifdef S_IXGRP
 174   if (mode & FILEIO_S_IXGRP)
 175     hmode |= S_IXGRP;
 176 #endif
 177   if (mode & FILEIO_S_IROTH)
 178     hmode |= S_IROTH;
 179 #ifdef S_IWOTH
 180   if (mode & FILEIO_S_IWOTH)
 181     hmode |= S_IWOTH;
 182 #endif
 183 #ifdef S_IXOTH
 184   if (mode & FILEIO_S_IXOTH)
 185     hmode |= S_IXOTH;
 186 #endif
 187   return hmode;
 188 }
 189
 190 static LONGEST
 191 remote_fileio_mode_to_target (mode_t mode)
 192 {
 193   mode_t tmode = 0;
 194
 195   if (mode & S_IFREG)
 196     tmode |= FILEIO_S_IFREG;
 197   if (mode & S_IFDIR)
 198     tmode |= FILEIO_S_IFDIR;
 199   if (mode & S_IFCHR)
 200     tmode |= FILEIO_S_IFCHR;
 201   if (mode & S_IRUSR)
 202     tmode |= FILEIO_S_IRUSR;
 203   if (mode & S_IWUSR)
 204     tmode |= FILEIO_S_IWUSR;
 205   if (mode & S_IXUSR)
 206     tmode |= FILEIO_S_IXUSR;
 207 #ifdef S_IRGRP
 208   if (mode & S_IRGRP)
 209     tmode |= FILEIO_S_IRGRP;
 210 #endif
 211 #ifdef S_IWRGRP
 212   if (mode & S_IWGRP)
 213     tmode |= FILEIO_S_IWGRP;
 214 #endif
 215 #ifdef S_IXGRP
 216   if (mode & S_IXGRP)
 217     tmode |= FILEIO_S_IXGRP;
 218 #endif
 219   if (mode & S_IROTH)
 220     tmode |= FILEIO_S_IROTH;
 221 #ifdef S_IWOTH
 222   if (mode & S_IWOTH)
 223     tmode |= FILEIO_S_IWOTH;
 224 #endif
 225 #ifdef S_IXOTH
 226   if (mode & S_IXOTH)
 227     tmode |= FILEIO_S_IXOTH;
 228 #endif
 229   return tmode;
 230 }
 231
 232 static int
 233 remote_fileio_errno_to_target (int error)
 234 {
 235   switch (error)
 236     {
 237       case EPERM:
 238         return FILEIO_EPERM;
 239       case ENOENT:
 240         return FILEIO_ENOENT;
 241       case EINTR:
 242         return FILEIO_EINTR;
 243       case EIO:
 244         return FILEIO_EIO;
 245       case EBADF:
 246         return FILEIO_EBADF;
 247       case EACCES:
 248         return FILEIO_EACCES;
 249       case EFAULT:
 250         return FILEIO_EFAULT;
 251       case EBUSY:
 252         return FILEIO_EBUSY;
 253       case EEXIST:
 254         return FILEIO_EEXIST;
 255       case ENODEV:
 256         return FILEIO_ENODEV;
 257       case ENOTDIR:
 258         return FILEIO_ENOTDIR;
 259       case EISDIR:
 260         return FILEIO_EISDIR;
 261       case EINVAL:
 262         return FILEIO_EINVAL;
 263       case ENFILE:
 264         return FILEIO_ENFILE;
 265       case EMFILE:
 266         return FILEIO_EMFILE;
 267       case EFBIG:
 268         return FILEIO_EFBIG;
 269       case ENOSPC:
 270         return FILEIO_ENOSPC;
 271       case ESPIPE:
 272         return FILEIO_ESPIPE;
 273       case EROFS:
 274         return FILEIO_EROFS;
 275       case ENOSYS:
 276         return FILEIO_ENOSYS;
 277       case ENAMETOOLONG:
 278         return FILEIO_ENAMETOOLONG;
 279     }
 280   return FILEIO_EUNKNOWN;
 281 }
 282
 283 static int
 284 remote_fileio_seek_flag_to_host (long num, int *flag)
 285 {
 286   if (!flag)
 287     return 0;
 288   switch (num)
 289     {
 290       case FILEIO_SEEK_SET:
 291         *flag = SEEK_SET;
 292         break;
 293       case FILEIO_SEEK_CUR:
 294         *flag =  SEEK_CUR;
 295         break;
 296       case FILEIO_SEEK_END:
 297         *flag =  SEEK_END;
 298         break;
 299       default:
 300         return -1;
 301     }
 302   return 0;
 303 }
 304
 305 static int
 306 remote_fileio_extract_long (char **buf, LONGEST *retlong)
 307 {
 308   char *c;
 309   int sign = 1;
 310
 311   if (!buf || !*buf || !**buf || !retlong)
 312     return -1;
 313   c = strchr (*buf, ',');
 314   if (c)
 315     *c++ = '\0';
 316   else
 317     c = strchr (*buf, '\0');
 318   while (strchr ("+-", **buf))
 319     {
 320       if (**buf == '-')
 321         sign = -sign;
 322       ++*buf;
 323     }
 324   for (*retlong = 0; **buf; ++*buf)
 325     {
 326       *retlong <<= 4;
 327       if (**buf >= '0' && **buf <= '9')
 328         *retlong += **buf - '0';
 329       else if (**buf >= 'a' && **buf <= 'f')
 330         *retlong += **buf - 'a' + 10;
 331       else if (**buf >= 'A' && **buf <= 'F')
 332         *retlong += **buf - 'A' + 10;
 333       else
 334         return -1;
 335     }
 336   *retlong *= sign;
 337   *buf = c;
 338   return 0;
 339 }
 340
 341 static int
 342 remote_fileio_extract_int (char **buf, long *retint)
 343 {
 344   int ret;
 345   LONGEST retlong;
 346
 347   if (!retint)
 348     return -1;
 349   ret = remote_fileio_extract_long (buf, &retlong);
 350   if (!ret)
 351     *retint = (long) retlong;
 352   return ret;
 353 }
 354
 355 static int
 356 remote_fileio_extract_ptr_w_len (char **buf, CORE_ADDR *ptrval, int *length)
 357 {
 358   char *c;
 359   LONGEST retlong;
 360
 361   if (!buf || !*buf || !**buf || !ptrval || !length)
 362     return -1;
 363   c = strchr (*buf, '/');
 364   if (!c)
 365     return -1;
 366   *c++ = '\0';
 367   if (remote_fileio_extract_long (buf, &retlong))
 368     return -1;
 369   *ptrval = (CORE_ADDR) retlong;
 370   *buf = c;
 371   if (remote_fileio_extract_long (buf, &retlong))
 372     return -1;
 373   *length = (int) retlong;
 374   return 0;
 375 }
 376
 377 /* Convert to big endian */
 378 static void
 379 remote_fileio_to_be (LONGEST num, char *buf, int bytes)
 380 {
 381   int i;
 382
 383   for (i = 0; i < bytes; ++i)
 384     buf[i] = (num >> (8 * (bytes - i - 1))) & 0xff;
 385 }
 386
 387 static void
 388 remote_fileio_to_fio_uint (long num, fio_uint_t fnum)
 389 {
 390   remote_fileio_to_be ((LONGEST) num, (char *) fnum, 4);
 391 }
 392
 393 static void
 394 remote_fileio_to_fio_mode (mode_t num, fio_mode_t fnum)
 395 {
 396   remote_fileio_to_be (remote_fileio_mode_to_target(num), (char *) fnum, 4);
 397 }
 398
 399 static void
 400 remote_fileio_to_fio_time (time_t num, fio_time_t fnum)
 401 {
 402   remote_fileio_to_be ((LONGEST) num, (char *) fnum, 4);
 403 }
 404
 405 static void
 406 remote_fileio_to_fio_long (LONGEST num, fio_long_t fnum)
 407 {
 408   remote_fileio_to_be (num, (char *) fnum, 8);
 409 }
 410
 411 static void
 412 remote_fileio_to_fio_ulong (LONGEST num, fio_ulong_t fnum)
 413 {
 414   remote_fileio_to_be (num, (char *) fnum, 8);
 415 }
 416
 417 static void
 418 remote_fileio_to_fio_stat (struct stat *st, struct fio_stat *fst)
 419 {
 420   LONGEST blksize;
 421
 422   /* `st_dev' is set in the calling function */
 423   remote_fileio_to_fio_uint ((long) st->st_ino, fst->fst_ino);
 424   remote_fileio_to_fio_mode (st->st_mode, fst->fst_mode);
 425   remote_fileio_to_fio_uint ((long) st->st_nlink, fst->fst_nlink);
 426   remote_fileio_to_fio_uint ((long) st->st_uid, fst->fst_uid);
 427   remote_fileio_to_fio_uint ((long) st->st_gid, fst->fst_gid);
 428   remote_fileio_to_fio_uint ((long) st->st_rdev, fst->fst_rdev);
 429   remote_fileio_to_fio_ulong ((LONGEST) st->st_size, fst->fst_size);
 430 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
 431   blksize = st->st_blksize;
 432 #else
 433   blksize = 512;
 434 #endif
 435   remote_fileio_to_fio_ulong (blksize, fst->fst_blksize);
 436 #if HAVE_STRUCT_STAT_ST_BLOCKS
 437   remote_fileio_to_fio_ulong ((LONGEST) st->st_blocks, fst->fst_blocks);
 438 #else
 439   /* FIXME: This is correct for DJGPP, but other systems that don't
 440      have st_blocks, if any, might prefer 512 instead of st_blksize.
 441      (eliz, 30-12-2003)  */
 442   remote_fileio_to_fio_ulong (((LONGEST) st->st_size + blksize - 1)
 443                               / blksize,
 444                               fst->fst_blocks);
 445 #endif
 446   remote_fileio_to_fio_time (st->st_atime, fst->fst_atime);
 447   remote_fileio_to_fio_time (st->st_mtime, fst->fst_mtime);
 448   remote_fileio_to_fio_time (st->st_ctime, fst->fst_ctime);
 449 }
 450
 451 static void
 452 remote_fileio_to_fio_timeval (struct timeval *tv, struct fio_timeval *ftv)
 453 {
 454   remote_fileio_to_fio_time (tv->tv_sec, ftv->ftv_sec);
 455   remote_fileio_to_fio_long (tv->tv_usec, ftv->ftv_usec);
 456 }
 457
 458 static int remote_fio_ctrl_c_flag = 0;
 459 static int remote_fio_no_longjmp = 0;
 460
 461 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 462 static struct sigaction remote_fio_sa;
 463 static struct sigaction remote_fio_osa;
 464 #else
 465 static void (*remote_fio_ofunc)(int);
 466 #endif
 467
 468 static void
 469 remote_fileio_sig_init (void)
 470 {
 471 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 472   remote_fio_sa.sa_handler = SIG_IGN;
 473   sigemptyset (&remote_fio_sa.sa_mask);
 474   remote_fio_sa.sa_flags = 0;
 475   sigaction (SIGINT, &remote_fio_sa, &remote_fio_osa);
 476 #else
 477   remote_fio_ofunc = signal (SIGINT, SIG_IGN);
 478 #endif
 479 }
 480
 481 static void
 482 remote_fileio_sig_set (void (*sigint_func)(int))
 483 {
 484 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 485   remote_fio_sa.sa_handler = sigint_func;
 486   sigemptyset (&remote_fio_sa.sa_mask);
 487   remote_fio_sa.sa_flags = 0;
 488   sigaction (SIGINT, &remote_fio_sa, NULL);
 489 #else
 490   signal (SIGINT, sigint_func);
 491 #endif
 492 }
 493
 494 static void
 495 remote_fileio_sig_exit (void)
 496 {
 497 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 498   sigaction (SIGINT, &remote_fio_osa, NULL);
 499 #else
 500   signal (SIGINT, remote_fio_ofunc);
 501 #endif
 502 }
 503
 504 static void
 505 remote_fileio_ctrl_c_signal_handler (int signo)
 506 {
 507   remote_fileio_sig_set (SIG_IGN);
 508   remote_fio_ctrl_c_flag = 1;
 509   if (!remote_fio_no_longjmp)
 510     deprecated_throw_reason (RETURN_QUIT);
 511   remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler);
 512 }
 513
 514 static void
 515 remote_fileio_reply (int retcode, int error)
 516 {
 517   char buf[32];
 518
 519   remote_fileio_sig_set (SIG_IGN);
 520   strcpy (buf, "F");
 521   if (retcode < 0)
 522     {
 523       strcat (buf, "-");
 524       retcode = -retcode;
 525     }
 526   sprintf (buf + strlen (buf), "%x", retcode);
 527   if (error || remote_fio_ctrl_c_flag)
 528     {
 529       if (error && remote_fio_ctrl_c_flag)
 530         error = FILEIO_EINTR;
 531       if (error < 0)
 532         {
 533           strcat (buf, "-");
 534           error = -error;
 535         }
 536       sprintf (buf + strlen (buf), ",%x", error);
 537       if (remote_fio_ctrl_c_flag)
 538         strcat (buf, ",C");
 539     }
 540   remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler);
 541   putpkt (buf);
 542 }
 543
 544 static void
 545 remote_fileio_ioerror (void)
 546 {
 547   remote_fileio_reply (-1, FILEIO_EIO);
 548 }
 549
 550 static void
 551 remote_fileio_badfd (void)
 552 {
 553   remote_fileio_reply (-1, FILEIO_EBADF);
 554 }
 555
 556 static void
 557 remote_fileio_return_errno (int retcode)
 558 {
 559   remote_fileio_reply (retcode,
 560                        retcode < 0 ? remote_fileio_errno_to_target (errno) : 0);
 561 }
 562
 563 static void
 564 remote_fileio_return_success (int retcode)
 565 {
 566   remote_fileio_reply (retcode, 0);
 567 }
 568
 569 /* Wrapper function for remote_write_bytes() which has the disadvantage to
 570    write only one packet, regardless of the requested number of bytes to
 571    transfer.  This wrapper calls remote_write_bytes() as often as needed. */
 572 static int
 573 remote_fileio_write_bytes (CORE_ADDR memaddr, char *myaddr, int len)
 574 {
 575   int ret = 0, written;
 576
 577   while (len > 0 && (written = remote_write_bytes (memaddr, myaddr, len)) > 0)
 578     {
 579       len -= written;
 580       memaddr += written;
 581       myaddr += written;
 582       ret += written;
 583     }
 584   return ret;
 585 }
 586
 587 static void
 588 remote_fileio_func_open (char *buf)
 589 {
 590   CORE_ADDR ptrval;
 591   int length, retlength;
 592   long num;
 593   int flags, fd;
 594   mode_t mode;
 595   char *pathname;
 596   struct stat st;
 597
 598   /* 1. Parameter: Ptr to pathname / length incl. trailing zero */
 599   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
 600     {
 601       remote_fileio_ioerror ();
 602       return;
 603     }
 604   /* 2. Parameter: open flags */
 605   if (remote_fileio_extract_int (&buf, &num))
 606     {
 607       remote_fileio_ioerror ();
 608       return;
 609     }
 610   flags = remote_fileio_oflags_to_host (num);
 611   /* 3. Parameter: open mode */
 612   if (remote_fileio_extract_int (&buf, &num))
 613     {
 614       remote_fileio_ioerror ();
 615       return;
 616     }
 617   mode = remote_fileio_mode_to_host (num, 1);
 618
 619   /* Request pathname using 'm' packet */
 620   pathname = alloca (length);
 621   retlength = remote_read_bytes (ptrval, pathname, length);
 622   if (retlength != length)
 623     {
 624       remote_fileio_ioerror ();
 625       return;
 626     }
 627
 628   /* Check if pathname exists and is not a regular file or directory.  If so,
 629      return an appropriate error code.  Same for trying to open directories
 630      for writing. */
 631   if (!stat (pathname, &st))
 632     {
 633       if (!S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode))
 634         {
 635           remote_fileio_reply (-1, FILEIO_ENODEV);
 636           return;
 637         }
 638       if (S_ISDIR (st.st_mode)
 639           && ((flags & O_WRONLY) == O_WRONLY || (flags & O_RDWR) == O_RDWR))
 640         {
 641           remote_fileio_reply (-1, FILEIO_EISDIR);
 642           return;
 643         }
 644     }
 645
 646   remote_fio_no_longjmp = 1;
 647   fd = open (pathname, flags, mode);
 648   if (fd < 0)
 649     {
 650       remote_fileio_return_errno (-1);
 651       return;
 652     }
 653
 654   fd = remote_fileio_fd_to_targetfd (fd);
 655   remote_fileio_return_success (fd);
 656 }
 657
 658 static void
 659 remote_fileio_func_close (char *buf)
 660 {
 661   long num;
 662   int fd;
 663
 664   /* Parameter: file descriptor */
 665   if (remote_fileio_extract_int (&buf, &num))
 666     {
 667       remote_fileio_ioerror ();
 668       return;
 669     }
 670   fd = remote_fileio_map_fd ((int) num);
 671   if (fd == FIO_FD_INVALID)
 672     {
 673       remote_fileio_badfd ();
 674       return;
 675     }
 676
 677   remote_fio_no_longjmp = 1;
 678   if (fd != FIO_FD_CONSOLE_IN && fd != FIO_FD_CONSOLE_OUT && close (fd))
 679     remote_fileio_return_errno (-1);
 680   remote_fileio_close_target_fd ((int) num);
 681   remote_fileio_return_success (0);
 682 }
 683
 684 static void
 685 remote_fileio_func_read (char *buf)
 686 {
 687   long target_fd, num;
 688   LONGEST lnum;
 689   CORE_ADDR ptrval;
 690   int fd, ret, retlength;
 691   char *buffer;
 692   size_t length;
 693   off_t old_offset, new_offset;
 694
 695   /* 1. Parameter: file descriptor */
 696   if (remote_fileio_extract_int (&buf, &target_fd))
 697     {
 698       remote_fileio_ioerror ();
 699       return;
 700     }
 701   fd = remote_fileio_map_fd ((int) target_fd);
 702   if (fd == FIO_FD_INVALID)
 703     {
 704       remote_fileio_badfd ();
 705       return;
 706     }
 707   /* 2. Parameter: buffer pointer */
 708   if (remote_fileio_extract_long (&buf, &lnum))
 709     {
 710       remote_fileio_ioerror ();
 711       return;
 712     }
 713   ptrval = (CORE_ADDR) lnum;
 714   /* 3. Parameter: buffer length */
 715   if (remote_fileio_extract_int (&buf, &num))
 716     {
 717       remote_fileio_ioerror ();
 718       return;
 719     }
 720   length = (size_t) num;
 721
 722   switch (fd)
 723     {
 724       case FIO_FD_CONSOLE_OUT:
 725         remote_fileio_badfd ();
 726         return;
 727       case FIO_FD_CONSOLE_IN:
 728         {
 729           static char *remaining_buf = NULL;
 730           static int remaining_length = 0;
 731
 732           buffer = (char *) xmalloc (32768);
 733           if (remaining_buf)
 734             {
 735               remote_fio_no_longjmp = 1;
 736               if (remaining_length > length)
 737                 {
 738                   memcpy (buffer, remaining_buf, length);
 739                   memmove (remaining_buf, remaining_buf + length,
 740                            remaining_length - length);
 741                   remaining_length -= length;
 742                   ret = length;
 743                 }
 744               else
 745                 {
 746                   memcpy (buffer, remaining_buf, remaining_length);
 747                   xfree (remaining_buf);
 748                   remaining_buf = NULL;
 749                   ret = remaining_length;
 750                 }
 751             }
 752           else
 753             {
 754               ret = ui_file_read (gdb_stdtargin, buffer, 32767);
 755               remote_fio_no_longjmp = 1;
 756               if (ret > 0 && (size_t)ret > length)
 757                 {
 758                   remaining_buf = (char *) xmalloc (ret - length);
 759                   remaining_length = ret - length;
 760                   memcpy (remaining_buf, buffer + length, remaining_length);
 761                   ret = length;
 762                 }
 763             }
 764         }
 765         break;
 766       default:
 767         buffer = (char *) xmalloc (length);
 768         /* POSIX defines EINTR behaviour of read in a weird way.  It's allowed
 769            for read() to return -1 even if "some" bytes have been read.  It
 770            has been corrected in SUSv2 but that doesn't help us much...
 771            Therefore a complete solution must check how many bytes have been
 772            read on EINTR to return a more reliable value to the target */
 773         old_offset = lseek (fd, 0, SEEK_CUR);
 774         remote_fio_no_longjmp = 1;
 775         ret = read (fd, buffer, length);
 776         if (ret < 0 && errno == EINTR)
 777           {
 778             new_offset = lseek (fd, 0, SEEK_CUR);
 779             /* If some data has been read, return the number of bytes read.
 780                The Ctrl-C flag is set in remote_fileio_reply() anyway */
 781             if (old_offset != new_offset)
 782               ret = new_offset - old_offset;
 783           }
 784         break;
 785     }
 786
 787   if (ret > 0)
 788     {
 789       retlength = remote_fileio_write_bytes (ptrval, buffer, ret);
 790       if (retlength != ret)
 791         ret = -1; /* errno has been set to EIO in remote_fileio_write_bytes() */
 792     }
 793
 794   if (ret < 0)
 795     remote_fileio_return_errno (-1);
 796   else
 797     remote_fileio_return_success (ret);
 798
 799   xfree (buffer);
 800 }
 801
 802 static void
 803 remote_fileio_func_write (char *buf)
 804 {
 805   long target_fd, num;
 806   LONGEST lnum;
 807   CORE_ADDR ptrval;
 808   int fd, ret, retlength;
 809   char *buffer;
 810   size_t length;
 811
 812   /* 1. Parameter: file descriptor */
 813   if (remote_fileio_extract_int (&buf, &target_fd))
 814     {
 815       remote_fileio_ioerror ();
 816       return;
 817     }
 818   fd = remote_fileio_map_fd ((int) target_fd);
 819   if (fd == FIO_FD_INVALID)
 820     {
 821       remote_fileio_badfd ();
 822       return;
 823     }
 824   /* 2. Parameter: buffer pointer */
 825   if (remote_fileio_extract_long (&buf, &lnum))
 826     {
 827       remote_fileio_ioerror ();
 828       return;
 829     }
 830   ptrval = (CORE_ADDR) lnum;
 831   /* 3. Parameter: buffer length */
 832   if (remote_fileio_extract_int (&buf, &num))
 833     {
 834       remote_fileio_ioerror ();
 835       return;
 836     }
 837   length = (size_t) num;
 838
 839   buffer = (char *) xmalloc (length);
 840   retlength = remote_read_bytes (ptrval, buffer, length);
 841   if (retlength != length)
 842     {
 843       xfree (buffer);
 844       remote_fileio_ioerror ();
 845       return;
 846     }
 847
 848   remote_fio_no_longjmp = 1;
 849   switch (fd)
 850     {
 851       case FIO_FD_CONSOLE_IN:
 852         remote_fileio_badfd ();
 853         return;
 854       case FIO_FD_CONSOLE_OUT:
 855         ui_file_write (target_fd == 1 ? gdb_stdtarg : gdb_stdtargerr, buffer,
 856                        length);
 857         gdb_flush (target_fd == 1 ? gdb_stdtarg : gdb_stdtargerr);
 858         ret = length;
 859         break;
 860       default:
 861         ret = write (fd, buffer, length);
 862         if (ret < 0 && errno == EACCES)
 863           errno = EBADF; /* Cygwin returns EACCESS when writing to a R/O file.*/
 864         break;
 865     }
 866
 867   if (ret < 0)
 868     remote_fileio_return_errno (-1);
 869   else
 870     remote_fileio_return_success (ret);
 871
 872   xfree (buffer);
 873 }
 874
 875 static void
 876 remote_fileio_func_lseek (char *buf)
 877 {
 878   long num;
 879   LONGEST lnum;
 880   int fd, flag;
 881   off_t offset, ret;
 882
 883   /* 1. Parameter: file descriptor */
 884   if (remote_fileio_extract_int (&buf, &num))
 885     {
 886       remote_fileio_ioerror ();
 887       return;
 888     }
 889   fd = remote_fileio_map_fd ((int) num);
 890   if (fd == FIO_FD_INVALID)
 891     {
 892       remote_fileio_badfd ();
 893       return;
 894     }
 895   else if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT)
 896     {
 897       remote_fileio_reply (-1, FILEIO_ESPIPE);
 898       return;
 899     }
 900
 901   /* 2. Parameter: offset */
 902   if (remote_fileio_extract_long (&buf, &lnum))
 903     {
 904       remote_fileio_ioerror ();
 905       return;
 906     }
 907   offset = (off_t) lnum;
 908   /* 3. Parameter: flag */
 909   if (remote_fileio_extract_int (&buf, &num))
 910     {
 911       remote_fileio_ioerror ();
 912       return;
 913     }
 914   if (remote_fileio_seek_flag_to_host (num, &flag))
 915     {
 916       remote_fileio_reply (-1, FILEIO_EINVAL);
 917       return;
 918     }
 919
 920   remote_fio_no_longjmp = 1;
 921   ret = lseek (fd, offset, flag);
 922
 923   if (ret == (off_t) -1)
 924     remote_fileio_return_errno (-1);
 925   else
 926     remote_fileio_return_success (ret);
 927 }
 928
 929 static void
 930 remote_fileio_func_rename (char *buf)
 931 {
 932   CORE_ADDR ptrval;
 933   int length, retlength;
 934   char *oldpath, *newpath;
 935   int ret, of, nf;
 936   struct stat ost, nst;
 937
 938   /* 1. Parameter: Ptr to oldpath / length incl. trailing zero */
 939   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
 940     {
 941       remote_fileio_ioerror ();
 942       return;
 943     }
 944   /* Request oldpath using 'm' packet */
 945   oldpath = alloca (length);
 946   retlength = remote_read_bytes (ptrval, oldpath, length);
 947   if (retlength != length)
 948     {
 949       remote_fileio_ioerror ();
 950       return;
 951     }
 952   /* 2. Parameter: Ptr to newpath / length incl. trailing zero */
 953   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
 954     {
 955       remote_fileio_ioerror ();
 956       return;
 957     }
 958   /* Request newpath using 'm' packet */
 959   newpath = alloca (length);
 960   retlength = remote_read_bytes (ptrval, newpath, length);
 961   if (retlength != length)
 962     {
 963       remote_fileio_ioerror ();
 964       return;
 965     }
 966
 967   /* Only operate on regular files and directories */
 968   of = stat (oldpath, &ost);
 969   nf = stat (newpath, &nst);
 970   if ((!of && !S_ISREG (ost.st_mode) && !S_ISDIR (ost.st_mode))
 971       || (!nf && !S_ISREG (nst.st_mode) && !S_ISDIR (nst.st_mode)))
 972     {
 973       remote_fileio_reply (-1, FILEIO_EACCES);
 974       return;
 975     }
 976
 977   remote_fio_no_longjmp = 1;
 978   ret = rename (oldpath, newpath);
 979
 980   if (ret == -1)
 981     {
 982       /* Special case: newpath is a non-empty directory.  Some systems
 983          return ENOTEMPTY, some return EEXIST.  We coerce that to be
 984          always EEXIST. */
 985       if (errno == ENOTEMPTY)
 986         errno = EEXIST;
 987 #ifdef __CYGWIN__
 988       /* Workaround some Cygwin problems with correct errnos. */
 989       if (errno == EACCES)
 990         {
 991           if (!of && !nf && S_ISDIR (nst.st_mode))
 992             {
 993               if (S_ISREG (ost.st_mode))
 994                 errno = EISDIR;
 995               else
 996                 {
 997                   char oldfullpath[PATH_MAX + 1];
 998                   char newfullpath[PATH_MAX + 1];
 999                   int len;
1000
1001                   cygwin_conv_to_full_posix_path (oldpath, oldfullpath);
1002                   cygwin_conv_to_full_posix_path (newpath, newfullpath);
1003                   len = strlen (oldfullpath);
1004                   if (newfullpath[len] == '/'
1005                       && !strncmp (oldfullpath, newfullpath, len))
1006                     errno = EINVAL;
1007                   else
1008                     errno = EEXIST;
1009                 }
1010             }
1011         }
1012 #endif
1013
1014       remote_fileio_return_errno (-1);
1015     }
1016   else
1017     remote_fileio_return_success (ret);
1018 }
1019
1020 static void
1021 remote_fileio_func_unlink (char *buf)
1022 {
1023   CORE_ADDR ptrval;
1024   int length, retlength;
1025   char *pathname;
1026   int ret;
1027   struct stat st;
1028
1029   /* Parameter: Ptr to pathname / length incl. trailing zero */
1030   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
1031     {
1032       remote_fileio_ioerror ();
1033       return;
1034     }
1035   /* Request pathname using 'm' packet */
1036   pathname = alloca (length);
1037   retlength = remote_read_bytes (ptrval, pathname, length);
1038   if (retlength != length)
1039     {
1040       remote_fileio_ioerror ();
1041       return;
1042     }
1043
1044   /* Only operate on regular files (and directories, which allows to return
1045      the correct return code) */
1046   if (!stat (pathname, &st) && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode))
1047     {
1048       remote_fileio_reply (-1, FILEIO_ENODEV);
1049       return;
1050     }
1051
1052   remote_fio_no_longjmp = 1;
1053   ret = unlink (pathname);
1054
1055   if (ret == -1)
1056     remote_fileio_return_errno (-1);
1057   else
1058     remote_fileio_return_success (ret);
1059 }
1060
1061 static void
1062 remote_fileio_func_stat (char *buf)
1063 {
1064   CORE_ADDR ptrval;
1065   int ret, length, retlength;
1066   char *pathname;
1067   LONGEST lnum;
1068   struct stat st;
1069   struct fio_stat fst;
1070
1071   /* 1. Parameter: Ptr to pathname / length incl. trailing zero */
1072   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
1073     {
1074       remote_fileio_ioerror ();
1075       return;
1076     }
1077   /* Request pathname using 'm' packet */
1078   pathname = alloca (length);
1079   retlength = remote_read_bytes (ptrval, pathname, length);
1080   if (retlength != length)
1081     {
1082       remote_fileio_ioerror ();
1083       return;
1084     }
1085
1086   /* 2. Parameter: Ptr to struct stat */
1087   if (remote_fileio_extract_long (&buf, &lnum))
1088     {
1089       remote_fileio_ioerror ();
1090       return;
1091     }
1092   ptrval = (CORE_ADDR) lnum;
1093
1094   remote_fio_no_longjmp = 1;
1095   ret = stat (pathname, &st);
1096
1097   if (ret == -1)
1098     {
1099       remote_fileio_return_errno (-1);
1100       return;
1101     }
1102   /* Only operate on regular files and directories */
1103   if (!ret && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode))
1104     {
1105       remote_fileio_reply (-1, FILEIO_EACCES);
1106       return;
1107     }
1108   if (ptrval)
1109     {
1110       remote_fileio_to_fio_stat (&st, &fst);
1111       remote_fileio_to_fio_uint (0, fst.fst_dev);
1112
1113       retlength = remote_fileio_write_bytes (ptrval, (char *) &fst, sizeof fst);
1114       if (retlength != sizeof fst)
1115         {
1116           remote_fileio_return_errno (-1);
1117           return;
1118         }
1119     }
1120   remote_fileio_return_success (ret);
1121 }
1122
1123 static void
1124 remote_fileio_func_fstat (char *buf)
1125 {
1126   CORE_ADDR ptrval;
1127   int fd, ret, retlength;
1128   long target_fd;
1129   LONGEST lnum;
1130   struct stat st;
1131   struct fio_stat fst;
1132   struct timeval tv;
1133
1134   /* 1. Parameter: file descriptor */
1135   if (remote_fileio_extract_int (&buf, &target_fd))
1136     {
1137       remote_fileio_ioerror ();
1138       return;
1139     }
1140   fd = remote_fileio_map_fd ((int) target_fd);
1141   if (fd == FIO_FD_INVALID)
1142     {
1143       remote_fileio_badfd ();
1144       return;
1145     }
1146   /* 2. Parameter: Ptr to struct stat */
1147   if (remote_fileio_extract_long (&buf, &lnum))
1148     {
1149       remote_fileio_ioerror ();
1150       return;
1151     }
1152   ptrval = (CORE_ADDR) lnum;
1153
1154   remote_fio_no_longjmp = 1;
1155   if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT)
1156     {
1157       remote_fileio_to_fio_uint (1, fst.fst_dev);
1158       st.st_mode = S_IFCHR | (fd == FIO_FD_CONSOLE_IN ? S_IRUSR : S_IWUSR);
1159       st.st_nlink = 1;
1160 #ifdef HAVE_GETUID
1161       st.st_uid = getuid ();
1162 #else
1163       st.st_uid = 0;
1164 #endif
1165 #ifdef HAVE_GETGID
1166       st.st_gid = getgid ();
1167 #else
1168       st.st_gid = 0;
1169 #endif
1170       st.st_rdev = 0;
1171       st.st_size = 0;
1172 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1173       st.st_blksize = 512;
1174 #endif
1175 #if HAVE_STRUCT_STAT_ST_BLOCKS
1176       st.st_blocks = 0;
1177 #endif
1178       if (!gettimeofday (&tv, NULL))
1179         st.st_atime = st.st_mtime = st.st_ctime = tv.tv_sec;
1180       else
1181         st.st_atime = st.st_mtime = st.st_ctime = (time_t) 0;
1182       ret = 0;
1183     }
1184   else
1185     ret = fstat (fd, &st);
1186
1187   if (ret == -1)
1188     {
1189       remote_fileio_return_errno (-1);
1190       return;
1191     }
1192   if (ptrval)
1193     {
1194       remote_fileio_to_fio_stat (&st, &fst);
1195
1196       retlength = remote_fileio_write_bytes (ptrval, (char *) &fst, sizeof fst);
1197       if (retlength != sizeof fst)
1198         {
1199           remote_fileio_return_errno (-1);
1200           return;
1201         }
1202     }
1203   remote_fileio_return_success (ret);
1204 }
1205
1206 static void
1207 remote_fileio_func_gettimeofday (char *buf)
1208 {
1209   LONGEST lnum;
1210   CORE_ADDR ptrval;
1211   int ret, retlength;
1212   struct timeval tv;
1213   struct fio_timeval ftv;
1214
1215   /* 1. Parameter: struct timeval pointer */
1216   if (remote_fileio_extract_long (&buf, &lnum))
1217     {
1218       remote_fileio_ioerror ();
1219       return;
1220     }
1221   ptrval = (CORE_ADDR) lnum;
1222   /* 2. Parameter: some pointer value... */
1223   if (remote_fileio_extract_long (&buf, &lnum))
1224     {
1225       remote_fileio_ioerror ();
1226       return;
1227     }
1228   /* ...which has to be NULL */
1229   if (lnum)
1230     {
1231       remote_fileio_reply (-1, FILEIO_EINVAL);
1232       return;
1233     }
1234
1235   remote_fio_no_longjmp = 1;
1236   ret = gettimeofday (&tv, NULL);
1237
1238   if (ret == -1)
1239     {
1240       remote_fileio_return_errno (-1);
1241       return;
1242     }
1243
1244   if (ptrval)
1245     {
1246       remote_fileio_to_fio_timeval (&tv, &ftv);
1247
1248       retlength = remote_fileio_write_bytes (ptrval, (char *) &ftv, sizeof ftv);
1249       if (retlength != sizeof ftv)
1250         {
1251           remote_fileio_return_errno (-1);
1252           return;
1253         }
1254     }
1255   remote_fileio_return_success (ret);
1256 }
1257
1258 static void
1259 remote_fileio_func_isatty (char *buf)
1260 {
1261   long target_fd;
1262   int fd;
1263
1264   /* Parameter: file descriptor */
1265   if (remote_fileio_extract_int (&buf, &target_fd))
1266     {
1267       remote_fileio_ioerror ();
1268       return;
1269     }
1270   remote_fio_no_longjmp = 1;
1271   fd = remote_fileio_map_fd ((int) target_fd);
1272   remote_fileio_return_success (fd == FIO_FD_CONSOLE_IN ||
1273                                 fd == FIO_FD_CONSOLE_OUT ? 1 : 0);
1274 }
1275
1276 static void
1277 remote_fileio_func_system (char *buf)
1278 {
1279   CORE_ADDR ptrval;
1280   int ret, length, retlength;
1281   char *cmdline;
1282
1283   /* Check if system(3) has been explicitely allowed using the
1284      `set remote system-call-allowed 1' command.  If not, return
1285      EPERM */
1286   if (!remote_fio_system_call_allowed)
1287     {
1288       remote_fileio_reply (-1, FILEIO_EPERM);
1289       return;
1290     }
1291
1292   /* Parameter: Ptr to commandline / length incl. trailing zero */
1293   if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length))
1294     {
1295       remote_fileio_ioerror ();
1296       return;
1297     }
1298   /* Request commandline using 'm' packet */
1299   cmdline = alloca (length);
1300   retlength = remote_read_bytes (ptrval, cmdline, length);
1301   if (retlength != length)
1302     {
1303       remote_fileio_ioerror ();
1304       return;
1305     }
1306
1307   remote_fio_no_longjmp = 1;
1308   ret = system (cmdline);
1309
1310   if (ret == -1)
1311     remote_fileio_return_errno (-1);
1312   else
1313     remote_fileio_return_success (WEXITSTATUS (ret));
1314 }
1315
1316 static struct {
1317   char *name;
1318   void (*func)(char *);
1319 } remote_fio_func_map[] = {
1320   "open", remote_fileio_func_open,
1321   "close", remote_fileio_func_close,
1322   "read", remote_fileio_func_read,
1323   "write", remote_fileio_func_write,
1324   "lseek", remote_fileio_func_lseek,
1325   "rename", remote_fileio_func_rename,
1326   "unlink", remote_fileio_func_unlink,
1327   "stat", remote_fileio_func_stat,
1328   "fstat", remote_fileio_func_fstat,
1329   "gettimeofday", remote_fileio_func_gettimeofday,
1330   "isatty", remote_fileio_func_isatty,
1331   "system", remote_fileio_func_system,
1332   NULL, NULL
1333 };
1334
1335 static int
1336 do_remote_fileio_request (struct ui_out *uiout, void *buf_arg)
1337 {
1338   char *buf = buf_arg;
1339   char *c;
1340   int idx;
1341
1342   remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler);
1343
1344   c = strchr (++buf, ',');
1345   if (c)
1346     *c++ = '\0';
1347   else
1348     c = strchr (buf, '\0');
1349   for (idx = 0; remote_fio_func_map[idx].name; ++idx)
1350     if (!strcmp (remote_fio_func_map[idx].name, buf))
1351       break;
1352   if (!remote_fio_func_map[idx].name)   /* ERROR: No such function. */
1353     return RETURN_ERROR;
1354   remote_fio_func_map[idx].func (c);
1355   return 0;
1356 }
1357
1358 void
1359 remote_fileio_request (char *buf)
1360 {
1361   int ex;
1362
1363   remote_fileio_sig_init ();
1364
1365   remote_fio_ctrl_c_flag = 0;
1366   remote_fio_no_longjmp = 0;
1367
1368   ex = catch_exceptions (uiout, do_remote_fileio_request, (void *)buf,
1369                          RETURN_MASK_ALL);
1370   switch (ex)
1371     {
1372       case RETURN_ERROR:
1373         remote_fileio_reply (-1, FILEIO_ENOSYS);
1374         break;
1375       case RETURN_QUIT:
1376         remote_fileio_reply (-1, FILEIO_EINTR);
1377         break;
1378       default:
1379         break;
1380     }
1381
1382   remote_fileio_sig_exit ();
1383 }
1384
1385 static void
1386 set_system_call_allowed (char *args, int from_tty)
1387 {
1388   if (args)
1389     {
1390       char *arg_end;
1391       int val = strtoul (args, &arg_end, 10);
1392       if (*args && *arg_end == '\0')
1393         {
1394           remote_fio_system_call_allowed = !!val;
1395           return;
1396         }
1397     }
1398   error (_("Illegal argument for \"set remote system-call-allowed\" command"));
1399 }
1400
1401 static void
1402 show_system_call_allowed (char *args, int from_tty)
1403 {
1404   if (args)
1405     error (_("Garbage after \"show remote system-call-allowed\" command: `%s'"), args);
1406   printf_unfiltered ("Calling host system(3) call from target is %sallowed\n",
1407                      remote_fio_system_call_allowed ? "" : "not ");
1408 }
1409
1410 void
1411 initialize_remote_fileio (struct cmd_list_element *remote_set_cmdlist,
1412                           struct cmd_list_element *remote_show_cmdlist)
1413 {
1414   add_cmd ("system-call-allowed", no_class,
1415            set_system_call_allowed,
1416            _("Set if the host system(3) call is allowed for the target."),
1417            &remote_set_cmdlist);
1418   add_cmd ("system-call-allowed", no_class,
1419            show_system_call_allowed,
1420            _("Show if the host system(3) call is allowed for the target."),
1421            &remote_show_cmdlist);
1422 }