arch/sandbox/cpu/os.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * SPDX-License-Identifier:     GPL-2.0+
   4  */
   5
   6 #include <dirent.h>
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <getopt.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <termios.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16 #include <sys/mman.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <linux/types.h>
  21
  22 #include <asm/getopt.h>
  23 #include <asm/sections.h>
  24 #include <asm/state.h>
  25 #include <os.h>
  26
  27 /* Operating System Interface */
  28
  29 ssize_t os_read(int fd, void *buf, size_t count)
  30 {
  31         return read(fd, buf, count);
  32 }
  33
  34 ssize_t os_read_no_block(int fd, void *buf, size_t count)
  35 {
  36         const int flags = fcntl(fd, F_GETFL, 0);
  37
  38         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
  39         return os_read(fd, buf, count);
  40 }
  41
  42 ssize_t os_write(int fd, const void *buf, size_t count)
  43 {
  44         return write(fd, buf, count);
  45 }
  46
  47 off_t os_lseek(int fd, off_t offset, int whence)
  48 {
  49         if (whence == OS_SEEK_SET)
  50                 whence = SEEK_SET;
  51         else if (whence == OS_SEEK_CUR)
  52                 whence = SEEK_CUR;
  53         else if (whence == OS_SEEK_END)
  54                 whence = SEEK_END;
  55         else
  56                 os_exit(1);
  57         return lseek(fd, offset, whence);
  58 }
  59
  60 int os_open(const char *pathname, int os_flags)
  61 {
  62         int flags;
  63
  64         switch (os_flags & OS_O_MASK) {
  65         case OS_O_RDONLY:
  66         default:
  67                 flags = O_RDONLY;
  68                 break;
  69
  70         case OS_O_WRONLY:
  71                 flags = O_WRONLY;
  72                 break;
  73
  74         case OS_O_RDWR:
  75                 flags = O_RDWR;
  76                 break;
  77         }
  78
  79         if (os_flags & OS_O_CREAT)
  80                 flags |= O_CREAT;
  81
  82         return open(pathname, flags, 0777);
  83 }
  84
  85 int os_close(int fd)
  86 {
  87         return close(fd);
  88 }
  89
  90 void os_exit(int exit_code)
  91 {
  92         exit(exit_code);
  93 }
  94
  95 /* Restore tty state when we exit */
  96 static struct termios orig_term;
  97
  98 static void os_fd_restore(void)
  99 {
 100         tcsetattr(0, TCSANOW, &orig_term);
 101 }
 102
 103 /* Put tty into raw mode so <tab> and <ctrl+c> work */
 104 void os_tty_raw(int fd)
 105 {
 106         static int setup = 0;
 107         struct termios term;
 108
 109         if (setup)
 110                 return;
 111         setup = 1;
 112
 113         /* If not a tty, don't complain */
 114         if (tcgetattr(fd, &orig_term))
 115                 return;
 116
 117         term = orig_term;
 118         term.c_iflag = IGNBRK | IGNPAR;
 119         term.c_oflag = OPOST | ONLCR;
 120         term.c_cflag = CS8 | CREAD | CLOCAL;
 121         term.c_lflag = 0;
 122         if (tcsetattr(fd, TCSANOW, &term))
 123                 return;
 124
 125         atexit(os_fd_restore);
 126 }
 127
 128 void *os_malloc(size_t length)
 129 {
 130         return mmap(NULL, length, PROT_READ | PROT_WRITE,
 131                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 132 }
 133
 134 void os_usleep(unsigned long usec)
 135 {
 136         usleep(usec);
 137 }
 138
 139 u64 __attribute__((no_instrument_function)) os_get_nsec(void)
 140 {
 141 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK)
 142         struct timespec tp;
 143         if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) {
 144                 struct timeval tv;
 145
 146                 gettimeofday(&tv, NULL);
 147                 tp.tv_sec = tv.tv_sec;
 148                 tp.tv_nsec = tv.tv_usec * 1000;
 149         }
 150         return tp.tv_sec * 1000000000ULL + tp.tv_nsec;
 151 #else
 152         struct timeval tv;
 153         gettimeofday(&tv, NULL);
 154         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 155 #endif
 156 }
 157
 158 static char *short_opts;
 159 static struct option *long_opts;
 160
 161 int os_parse_args(struct sandbox_state *state, int argc, char *argv[])
 162 {
 163         struct sb_cmdline_option **sb_opt = __u_boot_sandbox_option_start;
 164         size_t num_options = __u_boot_sandbox_option_count();
 165         size_t i;
 166
 167         int hidden_short_opt;
 168         size_t si;
 169
 170         int c;
 171
 172         if (short_opts || long_opts)
 173                 return 1;
 174
 175         state->argc = argc;
 176         state->argv = argv;
 177
 178         /* dynamically construct the arguments to the system getopt_long */
 179         short_opts = os_malloc(sizeof(*short_opts) * num_options * 2 + 1);
 180         long_opts = os_malloc(sizeof(*long_opts) * num_options);
 181         if (!short_opts || !long_opts)
 182                 return 1;
 183
 184         /*
 185          * getopt_long requires "val" to be unique (since that is what the
 186          * func returns), so generate unique values automatically for flags
 187          * that don't have a short option.  pick 0x100 as that is above the
 188          * single byte range (where ASCII/ISO-XXXX-X charsets live).
 189          */
 190         hidden_short_opt = 0x100;
 191         si = 0;
 192         for (i = 0; i < num_options; ++i) {
 193                 long_opts[i].name = sb_opt[i]->flag;
 194                 long_opts[i].has_arg = sb_opt[i]->has_arg ?
 195                         required_argument : no_argument;
 196                 long_opts[i].flag = NULL;
 197
 198                 if (sb_opt[i]->flag_short) {
 199                         short_opts[si++] = long_opts[i].val = sb_opt[i]->flag_short;
 200                         if (long_opts[i].has_arg == required_argument)
 201                                 short_opts[si++] = ':';
 202                 } else
 203                         long_opts[i].val = sb_opt[i]->flag_short = hidden_short_opt++;
 204         }
 205         short_opts[si] = '\0';
 206
 207         /* we need to handle output ourselves since u-boot provides printf */
 208         opterr = 0;
 209
 210         /*
 211          * walk all of the options the user gave us on the command line,
 212          * figure out what u-boot option structure they belong to (via
 213          * the unique short val key), and call the appropriate callback.
 214          */
 215         while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
 216                 for (i = 0; i < num_options; ++i) {
 217                         if (sb_opt[i]->flag_short == c) {
 218                                 if (sb_opt[i]->callback(state, optarg)) {
 219                                         state->parse_err = sb_opt[i]->flag;
 220                                         return 0;
 221                                 }
 222                                 break;
 223                         }
 224                 }
 225                 if (i == num_options) {
 226                         /*
 227                          * store the faulting flag for later display.  we have to
 228                          * store the flag itself as the getopt parsing itself is
 229                          * tricky: need to handle the following flags (assume all
 230                          * of the below are unknown):
 231                          *   -a        optopt='a' optind=<next>
 232                          *   -abbbb    optopt='a' optind=<this>
 233                          *   -aaaaa    optopt='a' optind=<this>
 234                          *   --a       optopt=0   optind=<this>
 235                          * as you can see, it is impossible to determine the exact
 236                          * faulting flag without doing the parsing ourselves, so
 237                          * we just report the specific flag that failed.
 238                          */
 239                         if (optopt) {
 240                                 static char parse_err[3] = { '-', 0, '\0', };
 241                                 parse_err[1] = optopt;
 242                                 state->parse_err = parse_err;
 243                         } else
 244                                 state->parse_err = argv[optind - 1];
 245                         break;
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 void os_dirent_free(struct os_dirent_node *node)
 253 {
 254         struct os_dirent_node *next;
 255
 256         while (node) {
 257                 next = node->next;
 258                 free(node);
 259                 node = next;
 260         }
 261 }
 262
 263 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
 264 {
 265         struct dirent entry, *result;
 266         struct os_dirent_node *head, *node, *next;
 267         struct stat buf;
 268         DIR *dir;
 269         int ret;
 270         char *fname;
 271         int len;
 272
 273         *headp = NULL;
 274         dir = opendir(dirname);
 275         if (!dir)
 276                 return -1;
 277
 278         /* Create a buffer for the maximum filename length */
 279         len = sizeof(entry.d_name) + strlen(dirname) + 2;
 280         fname = malloc(len);
 281         if (!fname) {
 282                 ret = -ENOMEM;
 283                 goto done;
 284         }
 285
 286         for (node = head = NULL;; node = next) {
 287                 ret = readdir_r(dir, &entry, &result);
 288                 if (ret || !result)
 289                         break;
 290                 next = malloc(sizeof(*node) + strlen(entry.d_name) + 1);
 291                 if (!next) {
 292                         os_dirent_free(head);
 293                         ret = -ENOMEM;
 294                         goto done;
 295                 }
 296                 strcpy(next->name, entry.d_name);
 297                 switch (entry.d_type) {
 298                 case DT_REG:
 299                         next->type = OS_FILET_REG;
 300                         break;
 301                 case DT_DIR:
 302                         next->type = OS_FILET_DIR;
 303                         break;
 304                 case DT_LNK:
 305                         next->type = OS_FILET_LNK;
 306                         break;
 307                 }
 308                 next->size = 0;
 309                 snprintf(fname, len, "%s/%s", dirname, next->name);
 310                 if (!stat(fname, &buf))
 311                         next->size = buf.st_size;
 312                 if (node)
 313                         node->next = next;
 314                 if (!head)
 315                         head = node;
 316         }
 317         *headp = head;
 318
 319 done:
 320         closedir(dir);
 321         return ret;
 322 }
 323
 324 const char *os_dirent_typename[OS_FILET_COUNT] = {
 325         "   ",
 326         "SYM",
 327         "DIR",
 328         "???",
 329 };
 330
 331 const char *os_dirent_get_typename(enum os_dirent_t type)
 332 {
 333         if (type >= 0 && type < OS_FILET_COUNT)
 334                 return os_dirent_typename[type];
 335
 336         return os_dirent_typename[OS_FILET_UNKNOWN];
 337 }
 338
 339 ssize_t os_get_filesize(const char *fname)
 340 {
 341         struct stat buf;
 342         int ret;
 343
 344         ret = stat(fname, &buf);
 345         if (ret)
 346                 return ret;
 347         return buf.st_size;
 348 }