posix/tst-spawn.c

   1 /* Tests for spawn.
   2    Copyright (C) 2000-2020 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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include <getopt.h>
  22 #include <errno.h>
  23 #include <error.h>
  24 #include <fcntl.h>
  25 #include <spawn.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/param.h>
  29
  30 #include <support/check.h>
  31 #include <support/xunistd.h>
  32 #include <support/temp_file.h>
  33 #include <support/support.h>
  34
  35
  36 /* Nonzero if the program gets called via `exec'.  */
  37 static int restart;
  38
  39
  40 #define CMDLINE_OPTIONS \
  41   { "restart", no_argument, &restart, 1 },
  42
  43 /* Name of the temporary files.  */
  44 static char *name1;
  45 static char *name2;
  46 static char *name3;
  47 static char *name5;
  48
  49 /* Descriptors for the temporary files.  */
  50 static int temp_fd1 = -1;
  51 static int temp_fd2 = -1;
  52 static int temp_fd3 = -1;
  53 static int temp_fd5 = -1;
  54
  55 /* The contents of our files.  */
  56 static const char fd1string[] = "This file should get closed";
  57 static const char fd2string[] = "This file should stay opened";
  58 static const char fd3string[] = "This file will be opened";
  59 static const char fd5string[] = "This file should stay opened (O_CLOEXEC)";
  60
  61
  62 /* We have a preparation function.  */
  63 static void
  64 do_prepare (int argc, char *argv[])
  65 {
  66   /* We must not open any files in the restart case.  */
  67   if (restart)
  68     return;
  69
  70   TEST_VERIFY_EXIT ((temp_fd1 = create_temp_file ("spawn", &name1)) != -1);
  71   TEST_VERIFY_EXIT ((temp_fd2 = create_temp_file ("spawn", &name2)) != -1);
  72   TEST_VERIFY_EXIT ((temp_fd3 = create_temp_file ("spawn", &name3)) != -1);
  73   TEST_VERIFY_EXIT ((temp_fd5 = create_temp_file ("spawn", &name5)) != -1);
  74
  75   int flags;
  76   TEST_VERIFY_EXIT ((flags = fcntl (temp_fd5, F_GETFD, &flags)) != -1);
  77   TEST_COMPARE (fcntl (temp_fd5, F_SETFD, flags | FD_CLOEXEC), 0);
  78 }
  79 #define PREPARE do_prepare
  80
  81
  82 static int
  83 handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
  84                 const char *fd4s, const char *name, const char *fd5s)
  85 {
  86   char buf[100];
  87   int fd1;
  88   int fd2;
  89   int fd3;
  90   int fd4;
  91   int fd5;
  92
  93   /* First get the descriptors.  */
  94   fd1 = atol (fd1s);
  95   fd2 = atol (fd2s);
  96   fd3 = atol (fd3s);
  97   fd4 = atol (fd4s);
  98   fd5 = atol (fd5s);
  99
 100   /* Sanity check.  */
 101   TEST_VERIFY_EXIT (fd1 != fd2);
 102   TEST_VERIFY_EXIT (fd1 != fd3);
 103   TEST_VERIFY_EXIT (fd1 != fd4);
 104   TEST_VERIFY_EXIT (fd2 != fd3);
 105   TEST_VERIFY_EXIT (fd2 != fd4);
 106   TEST_VERIFY_EXIT (fd3 != fd4);
 107   TEST_VERIFY_EXIT (fd4 != fd5);
 108
 109   /* First the easy part: read from the file descriptor which is
 110      supposed to be open.  */
 111   TEST_COMPARE (xlseek (fd2, 0, SEEK_CUR), strlen (fd2string));
 112   /* The duped descriptor must have the same position.  */
 113   TEST_COMPARE (xlseek (fd4, 0, SEEK_CUR), strlen (fd2string));
 114   TEST_COMPARE (xlseek (fd2, 0, SEEK_SET), 0);
 115   TEST_COMPARE (xlseek (fd4, 0, SEEK_CUR), 0);
 116   TEST_COMPARE (read (fd2, buf, sizeof buf), strlen (fd2string));
 117   TEST_COMPARE_BLOB (fd2string, strlen (fd2string), buf, strlen (fd2string));
 118
 119   /* Now read from the third file.  */
 120   TEST_COMPARE (read (fd3, buf, sizeof buf), strlen (fd3string));
 121   TEST_COMPARE_BLOB (fd3string, strlen (fd3string), buf, strlen (fd3string));
 122   /* Try to write to the file.  This should not be allowed.  */
 123   TEST_COMPARE (write (fd3, "boo!", 4), -1);
 124   TEST_COMPARE (errno, EBADF);
 125
 126   /* Now try to read the first file.  First make sure it is not opened.  */
 127   TEST_COMPARE (lseek (fd1, 0, SEEK_CUR), (off_t) -1);
 128   TEST_COMPARE (errno, EBADF);
 129
 130   /* Now open the file and read it.  */
 131   fd1 = xopen (name, O_RDONLY, 0600);
 132
 133   TEST_COMPARE (read (fd1, buf, sizeof buf), strlen (fd1string));
 134   TEST_COMPARE_BLOB (fd1string, strlen (fd1string), buf, strlen (fd1string));
 135
 136   TEST_COMPARE (xlseek (fd5, 0, SEEK_SET), 0);
 137   TEST_COMPARE (read (fd5, buf, sizeof buf), strlen (fd5string));
 138   TEST_COMPARE_BLOB (fd5string, strlen (fd5string), buf, strlen (fd5string));
 139
 140   return 0;
 141 }
 142
 143
 144 static int
 145 do_test (int argc, char *argv[])
 146 {
 147   pid_t pid;
 148   int fd4;
 149   int status;
 150   posix_spawn_file_actions_t actions;
 151   char fd1name[18];
 152   char fd2name[18];
 153   char fd3name[18];
 154   char fd4name[18];
 155   char fd5name[18];
 156   char *name3_copy;
 157   char *spargv[13];
 158   int i;
 159
 160   /* We must have
 161      - one or four parameters left if called initially
 162        + path for ld.so         optional
 163        + "--library-path"       optional
 164        + the library path       optional
 165        + the application name
 166      - six parameters left if called through re-execution
 167        + file descriptor number which is supposed to be closed
 168        + the open file descriptor
 169        + the newly opened file descriptor
 170        + the duped second descriptor
 171        + the name of the closed descriptor
 172        + the duped fourth file descriptor which O_CLOEXEC should be
 173          remove by adddup2.
 174   */
 175   if (argc != (restart ? 7 : 2) && argc != (restart ? 7 : 5))
 176     FAIL_EXIT1 ("wrong number of arguments (%d)", argc);
 177
 178   if (restart)
 179     return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5],
 180                            argv[6]);
 181
 182   /* Prepare the test.  We are creating four files: two which file descriptor
 183      will be marked with FD_CLOEXEC, another which is not.  */
 184
 185   /* Write something in the files.  */
 186   xwrite (temp_fd1, fd1string, strlen (fd1string));
 187   xwrite (temp_fd2, fd2string, strlen (fd2string));
 188   xwrite (temp_fd3, fd3string, strlen (fd3string));
 189   xwrite (temp_fd5, fd5string, strlen (fd5string));
 190
 191   /* Close the third file.  It'll be opened by `spawn'.  */
 192   xclose (temp_fd3);
 193
 194   /* Tell `spawn' what to do.  */
 195   TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
 196   /* Close `temp_fd1'.  */
 197   TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, temp_fd1), 0);
 198   /* We want to open the third file.  */
 199   name3_copy = xstrdup (name3);
 200   TEST_COMPARE (posix_spawn_file_actions_addopen (&actions, temp_fd3,
 201                                                   name3_copy,
 202                                                   O_RDONLY, 0666),
 203                 0);
 204   /* Overwrite the name to check that a copy has been made.  */
 205   memset (name3_copy, 'X', strlen (name3_copy));
 206
 207   /* We dup the second descriptor.  */
 208   fd4 = MAX (2, MAX (temp_fd1, MAX (temp_fd2, MAX (temp_fd3, temp_fd5)))) + 1;
 209   TEST_COMPARE (posix_spawn_file_actions_adddup2 (&actions, temp_fd2, fd4),
 210                 0);
 211
 212   /* We clear the O_CLOEXEC on fourth descriptor, so it should be
 213      stay open on child.  */
 214   TEST_COMPARE (posix_spawn_file_actions_adddup2 (&actions, temp_fd5,
 215                                                   temp_fd5),
 216                 0);
 217
 218   /* Now spawn the process.  */
 219   snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
 220   snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
 221   snprintf (fd3name, sizeof fd3name, "%d", temp_fd3);
 222   snprintf (fd4name, sizeof fd4name, "%d", fd4);
 223   snprintf (fd5name, sizeof fd5name, "%d", temp_fd5);
 224
 225   for (i = 0; i < (argc == (restart ? 7 : 5) ? 4 : 1); i++)
 226     spargv[i] = argv[i + 1];
 227   spargv[i++] = (char *) "--direct";
 228   spargv[i++] = (char *) "--restart";
 229   spargv[i++] = fd1name;
 230   spargv[i++] = fd2name;
 231   spargv[i++] = fd3name;
 232   spargv[i++] = fd4name;
 233   spargv[i++] = name1;
 234   spargv[i++] = fd5name;
 235   spargv[i] = NULL;
 236
 237   TEST_COMPARE (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ),
 238                 0);
 239
 240   /* Wait for the children.  */
 241   TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
 242   TEST_VERIFY (WIFEXITED (status));
 243   TEST_VERIFY (!WIFSIGNALED (status));
 244   TEST_COMPARE (WEXITSTATUS (status), 0);
 245
 246   /* Same test but with a NULL pid argument.  */
 247   TEST_COMPARE (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ),
 248                 0);
 249
 250   /* Cleanup.  */
 251   TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
 252   free (name3_copy);
 253
 254   /* Wait for the children.  */
 255   xwaitpid (-1, &status, 0);
 256   TEST_VERIFY (WIFEXITED (status));
 257   TEST_VERIFY (!WIFSIGNALED (status));
 258   TEST_COMPARE (WEXITSTATUS (status), 0);
 259
 260   return 0;
 261 }
 262
 263 #define TEST_FUNCTION_ARGV do_test
 264 #include <support/test-driver.c>