posix/tst-spawn.c

   1 /* Tests for spawn.
   2    Copyright (C) 2000-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <fcntl.h>
  23 #include <spawn.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <wait.h>
  28 #include <sys/param.h>
  29
  30
  31 /* Nonzero if the program gets called via `exec'.  */
  32 static int restart;
  33
  34
  35 #define CMDLINE_OPTIONS \
  36   { "restart", no_argument, &restart, 1 },
  37
  38 /* Prototype for our test function.  */
  39 extern void do_prepare (int argc, char *argv[]);
  40 extern int do_test (int argc, char *argv[]);
  41
  42 /* We have a preparation function.  */
  43 #define PREPARE do_prepare
  44
  45 #include "../test-skeleton.c"
  46
  47
  48 /* Name of the temporary files.  */
  49 static char *name1;
  50 static char *name2;
  51 static char *name3;
  52
  53 /* The contents of our files.  */
  54 static const char fd1string[] = "This file should get closed";
  55 static const char fd2string[] = "This file should stay opened";
  56 static const char fd3string[] = "This file will be opened";
  57
  58
  59 /* We have a preparation function.  */
  60 void
  61 do_prepare (int argc, char *argv[])
  62 {
  63    size_t name_len;
  64
  65    name_len = strlen (test_dir);
  66    name1 = (char *) xmalloc (name_len + sizeof ("/spawnXXXXXX"));
  67    mempcpy (mempcpy (name1, test_dir, name_len),
  68             "/spawnXXXXXX", sizeof ("/spawnXXXXXX"));
  69    add_temp_file (name1);
  70
  71    name2 = (char *) xmalloc (name_len + sizeof ("/spawnXXXXXX"));
  72    mempcpy (mempcpy (name2, test_dir, name_len),
  73             "/spawnXXXXXX", sizeof ("/spawnXXXXXX"));
  74    add_temp_file (name2);
  75
  76    name3 = (char *) xmalloc (name_len + sizeof ("/spawnXXXXXX"));
  77    mempcpy (mempcpy (name3, test_dir, name_len),
  78             "/spawnXXXXXX", sizeof ("/spawnXXXXXX"));
  79    add_temp_file (name3);
  80 }
  81
  82
  83 static int
  84 handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
  85                 const char *fd4s, const char *name)
  86 {
  87   char buf[100];
  88   int fd1;
  89   int fd2;
  90   int fd3;
  91   int fd4;
  92
  93   /* First get the descriptors.  */
  94   fd1 = atol (fd1s);
  95   fd2 = atol (fd2s);
  96   fd3 = atol (fd3s);
  97   fd4 = atol (fd4s);
  98
  99   /* Sanity check.  */
 100   if (fd1 == fd2)
 101     error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");
 102   if (fd1 == fd3)
 103     error (EXIT_FAILURE, 0, "value of fd1 and fd3 is the same");
 104   if (fd1 == fd4)
 105     error (EXIT_FAILURE, 0, "value of fd1 and fd4 is the same");
 106   if (fd2 == fd3)
 107     error (EXIT_FAILURE, 0, "value of fd2 and fd3 is the same");
 108   if (fd2 == fd4)
 109     error (EXIT_FAILURE, 0, "value of fd2 and fd4 is the same");
 110   if (fd3 == fd4)
 111     error (EXIT_FAILURE, 0, "value of fd3 and fd4 is the same");
 112
 113   /* First the easy part: read from the file descriptor which is
 114      supposed to be open.  */
 115   if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
 116     error (EXIT_FAILURE, errno, "file 2 not in right position");
 117   /* The duped descriptor must have the same position.  */
 118   if (lseek (fd4, 0, SEEK_CUR) != strlen (fd2string))
 119     error (EXIT_FAILURE, errno, "file 4 not in right position");
 120   if (lseek (fd2, 0, SEEK_SET) != 0)
 121     error (EXIT_FAILURE, 0, "cannot reset position in file 2");
 122   if (lseek (fd4, 0, SEEK_CUR) != 0)
 123     error (EXIT_FAILURE, errno, "file 4 not set back, too");
 124   if (read (fd2, buf, sizeof buf) != strlen (fd2string))
 125     error (EXIT_FAILURE, 0, "cannot read file 2");
 126   if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
 127     error (EXIT_FAILURE, 0, "file 2 does not match");
 128
 129   /* Now read from the third file.  */
 130   if (read (fd3, buf, sizeof buf) != strlen (fd3string))
 131     error (EXIT_FAILURE, 0, "cannot read file 3");
 132   if (memcmp (fd3string, buf, strlen (fd3string)) != 0)
 133     error (EXIT_FAILURE, 0, "file 3 does not match");
 134   /* Try to write to the file.  This should not be allowed.  */
 135   if (write (fd3, "boo!", 4) != -1 || errno != EBADF)
 136     error (EXIT_FAILURE, 0, "file 3 is writable");
 137
 138   /* Now try to read the first file.  First make sure it is not opened.  */
 139   if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
 140     error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);
 141
 142   /* Now open the file and read it.  */
 143   fd1 = open (name, O_RDONLY);
 144   if (fd1 == -1)
 145     error (EXIT_FAILURE, errno,
 146            "cannot open first file \"%s\" for verification", name);
 147
 148   if (read (fd1, buf, sizeof buf) != strlen (fd1string))
 149     error (EXIT_FAILURE, errno, "cannot read file 1");
 150   if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
 151     error (EXIT_FAILURE, 0, "file 1 does not match");
 152
 153   return 0;
 154 }
 155
 156
 157 int
 158 do_test (int argc, char *argv[])
 159 {
 160   pid_t pid;
 161   int fd1;
 162   int fd2;
 163   int fd3;
 164   int fd4;
 165   int status;
 166   posix_spawn_file_actions_t actions;
 167   char fd1name[18];
 168   char fd2name[18];
 169   char fd3name[18];
 170   char fd4name[18];
 171   char *name3_copy;
 172   char *spargv[12];
 173   int i;
 174
 175   /* We must have
 176      - one or four parameters left if called initially
 177        + path for ld.so         optional
 178        + "--library-path"       optional
 179        + the library path       optional
 180        + the application name
 181      - five parameters left if called through re-execution
 182        + file descriptor number which is supposed to be closed
 183        + the open file descriptor
 184        + the newly opened file descriptor
 185        + thhe duped second descriptor
 186        + the name of the closed descriptor
 187   */
 188   if (argc != (restart ? 6 : 2) && argc != (restart ? 6 : 5))
 189     error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
 190
 191   if (restart)
 192     return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5]);
 193
 194   /* Prepare the test.  We are creating two files: one which file descriptor
 195      will be marked with FD_CLOEXEC, another which is not.  */
 196
 197    /* Open our test files.   */
 198    fd1 = mkstemp (name1);
 199    if (fd1 == -1)
 200      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name1);
 201    fd2 = mkstemp (name2);
 202    if (fd2 == -1)
 203      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name2);
 204    fd3 = mkstemp (name3);
 205    if (fd3 == -1)
 206      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name3);
 207
 208    /* Write something in the files.  */
 209    if (write (fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
 210      error (EXIT_FAILURE, errno, "cannot write to first file");
 211    if (write (fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
 212      error (EXIT_FAILURE, errno, "cannot write to second file");
 213    if (write (fd3, fd3string, strlen (fd3string)) != strlen (fd3string))
 214      error (EXIT_FAILURE, errno, "cannot write to third file");
 215
 216    /* Close the third file.  It'll be opened by `spawn'.  */
 217    close (fd3);
 218
 219    /* Tell `spawn' what to do.  */
 220    if (posix_spawn_file_actions_init (&actions) != 0)
 221      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_init");
 222    /* Close `fd1'.  */
 223    if (posix_spawn_file_actions_addclose (&actions, fd1) != 0)
 224      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addclose");
 225    /* We want to open the third file.  */
 226    name3_copy = strdup (name3);
 227    if (name3_copy == NULL)
 228      error (EXIT_FAILURE, errno, "strdup");
 229    if (posix_spawn_file_actions_addopen (&actions, fd3, name3_copy,
 230                                          O_RDONLY, 0666) != 0)
 231      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addopen");
 232    /* Overwrite the name to check that a copy has been made.  */
 233    memset (name3_copy, 'X', strlen (name3_copy));
 234
 235    /* We dup the second descriptor.  */
 236    fd4 = MAX (2, MAX (fd1, MAX (fd2, fd3))) + 1;
 237    if (posix_spawn_file_actions_adddup2 (&actions, fd2, fd4) != 0)
 238      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_adddup2");
 239
 240    /* Now spawn the process.  */
 241    snprintf (fd1name, sizeof fd1name, "%d", fd1);
 242    snprintf (fd2name, sizeof fd2name, "%d", fd2);
 243    snprintf (fd3name, sizeof fd3name, "%d", fd3);
 244    snprintf (fd4name, sizeof fd4name, "%d", fd4);
 245
 246    for (i = 0; i < (argc == (restart ? 6 : 5) ? 4 : 1); i++)
 247      spargv[i] = argv[i + 1];
 248    spargv[i++] = (char *) "--direct";
 249    spargv[i++] = (char *) "--restart";
 250    spargv[i++] = fd1name;
 251    spargv[i++] = fd2name;
 252    spargv[i++] = fd3name;
 253    spargv[i++] = fd4name;
 254    spargv[i++] = name1;
 255    spargv[i] = NULL;
 256
 257    if (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ) != 0)
 258      error (EXIT_FAILURE, errno, "posix_spawn");
 259
 260    /* Same test but with a NULL pid argument.  */
 261    if (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ) != 0)
 262      error (EXIT_FAILURE, errno, "posix_spawn");
 263
 264    /* Cleanup.  */
 265    if (posix_spawn_file_actions_destroy (&actions) != 0)
 266      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_destroy");
 267    free (name3_copy);
 268
 269   /* Wait for the child.  */
 270   if (waitpid (pid, &status, 0) != pid)
 271     error (EXIT_FAILURE, errno, "wrong child");
 272
 273   if (WTERMSIG (status) != 0)
 274     error (EXIT_FAILURE, 0, "Child terminated incorrectly");
 275   status = WEXITSTATUS (status);
 276
 277   /* Remove the test files.  */
 278   unlink (name1);
 279   unlink (name2);
 280   unlink (name3);
 281
 282   return status;
 283 }