posix/tst-spawn.c

   1 /* Tests for spawn.
   2    Copyright (C) 2000-2017 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 /* Descriptors for the temporary files.  */
  54 static int temp_fd1 = -1;
  55 static int temp_fd2 = -1;
  56 static int temp_fd3 = -1;
  57
  58 /* The contents of our files.  */
  59 static const char fd1string[] = "This file should get closed";
  60 static const char fd2string[] = "This file should stay opened";
  61 static const char fd3string[] = "This file will be opened";
  62
  63
  64 /* We have a preparation function.  */
  65 void
  66 do_prepare (int argc, char *argv[])
  67 {
  68   /* We must not open any files in the restart case.  */
  69   if (restart)
  70     return;
  71
  72   temp_fd1 = create_temp_file ("spawn", &name1);
  73   temp_fd2 = create_temp_file ("spawn", &name2);
  74   temp_fd3 = create_temp_file ("spawn", &name3);
  75   if (temp_fd1 < 0 || temp_fd2 < 0 || temp_fd3 < 0)
  76     exit (1);
  77 }
  78
  79
  80 static int
  81 handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
  82                 const char *fd4s, const char *name)
  83 {
  84   char buf[100];
  85   int fd1;
  86   int fd2;
  87   int fd3;
  88   int fd4;
  89
  90   /* First get the descriptors.  */
  91   fd1 = atol (fd1s);
  92   fd2 = atol (fd2s);
  93   fd3 = atol (fd3s);
  94   fd4 = atol (fd4s);
  95
  96   /* Sanity check.  */
  97   if (fd1 == fd2)
  98     error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");
  99   if (fd1 == fd3)
 100     error (EXIT_FAILURE, 0, "value of fd1 and fd3 is the same");
 101   if (fd1 == fd4)
 102     error (EXIT_FAILURE, 0, "value of fd1 and fd4 is the same");
 103   if (fd2 == fd3)
 104     error (EXIT_FAILURE, 0, "value of fd2 and fd3 is the same");
 105   if (fd2 == fd4)
 106     error (EXIT_FAILURE, 0, "value of fd2 and fd4 is the same");
 107   if (fd3 == fd4)
 108     error (EXIT_FAILURE, 0, "value of fd3 and fd4 is the same");
 109
 110   /* First the easy part: read from the file descriptor which is
 111      supposed to be open.  */
 112   if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
 113     error (EXIT_FAILURE, errno, "file 2 not in right position");
 114   /* The duped descriptor must have the same position.  */
 115   if (lseek (fd4, 0, SEEK_CUR) != strlen (fd2string))
 116     error (EXIT_FAILURE, errno, "file 4 not in right position");
 117   if (lseek (fd2, 0, SEEK_SET) != 0)
 118     error (EXIT_FAILURE, 0, "cannot reset position in file 2");
 119   if (lseek (fd4, 0, SEEK_CUR) != 0)
 120     error (EXIT_FAILURE, errno, "file 4 not set back, too");
 121   if (read (fd2, buf, sizeof buf) != strlen (fd2string))
 122     error (EXIT_FAILURE, 0, "cannot read file 2");
 123   if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
 124     error (EXIT_FAILURE, 0, "file 2 does not match");
 125
 126   /* Now read from the third file.  */
 127   if (read (fd3, buf, sizeof buf) != strlen (fd3string))
 128     error (EXIT_FAILURE, 0, "cannot read file 3");
 129   if (memcmp (fd3string, buf, strlen (fd3string)) != 0)
 130     error (EXIT_FAILURE, 0, "file 3 does not match");
 131   /* Try to write to the file.  This should not be allowed.  */
 132   if (write (fd3, "boo!", 4) != -1 || errno != EBADF)
 133     error (EXIT_FAILURE, 0, "file 3 is writable");
 134
 135   /* Now try to read the first file.  First make sure it is not opened.  */
 136   if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
 137     error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);
 138
 139   /* Now open the file and read it.  */
 140   fd1 = open (name, O_RDONLY);
 141   if (fd1 == -1)
 142     error (EXIT_FAILURE, errno,
 143            "cannot open first file \"%s\" for verification", name);
 144
 145   if (read (fd1, buf, sizeof buf) != strlen (fd1string))
 146     error (EXIT_FAILURE, errno, "cannot read file 1");
 147   if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
 148     error (EXIT_FAILURE, 0, "file 1 does not match");
 149
 150   return 0;
 151 }
 152
 153
 154 int
 155 do_test (int argc, char *argv[])
 156 {
 157   pid_t pid;
 158   int fd4;
 159   int status;
 160   posix_spawn_file_actions_t actions;
 161   char fd1name[18];
 162   char fd2name[18];
 163   char fd3name[18];
 164   char fd4name[18];
 165   char *name3_copy;
 166   char *spargv[12];
 167   int i;
 168
 169   /* We must have
 170      - one or four parameters left if called initially
 171        + path for ld.so         optional
 172        + "--library-path"       optional
 173        + the library path       optional
 174        + the application name
 175      - five parameters left if called through re-execution
 176        + file descriptor number which is supposed to be closed
 177        + the open file descriptor
 178        + the newly opened file descriptor
 179        + thhe duped second descriptor
 180        + the name of the closed descriptor
 181   */
 182   if (argc != (restart ? 6 : 2) && argc != (restart ? 6 : 5))
 183     error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
 184
 185   if (restart)
 186     return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5]);
 187
 188   /* Prepare the test.  We are creating two files: one which file descriptor
 189      will be marked with FD_CLOEXEC, another which is not.  */
 190
 191    /* Write something in the files.  */
 192    if (write (temp_fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
 193      error (EXIT_FAILURE, errno, "cannot write to first file");
 194    if (write (temp_fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
 195      error (EXIT_FAILURE, errno, "cannot write to second file");
 196    if (write (temp_fd3, fd3string, strlen (fd3string)) != strlen (fd3string))
 197      error (EXIT_FAILURE, errno, "cannot write to third file");
 198
 199    /* Close the third file.  It'll be opened by `spawn'.  */
 200    close (temp_fd3);
 201
 202    /* Tell `spawn' what to do.  */
 203    if (posix_spawn_file_actions_init (&actions) != 0)
 204      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_init");
 205    /* Close `temp_fd1'.  */
 206    if (posix_spawn_file_actions_addclose (&actions, temp_fd1) != 0)
 207      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addclose");
 208    /* We want to open the third file.  */
 209    name3_copy = strdup (name3);
 210    if (name3_copy == NULL)
 211      error (EXIT_FAILURE, errno, "strdup");
 212    if (posix_spawn_file_actions_addopen (&actions, temp_fd3, name3_copy,
 213                                          O_RDONLY, 0666) != 0)
 214      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addopen");
 215    /* Overwrite the name to check that a copy has been made.  */
 216    memset (name3_copy, 'X', strlen (name3_copy));
 217
 218    /* We dup the second descriptor.  */
 219    fd4 = MAX (2, MAX (temp_fd1, MAX (temp_fd2, temp_fd3))) + 1;
 220    if (posix_spawn_file_actions_adddup2 (&actions, temp_fd2, fd4) != 0)
 221      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_adddup2");
 222
 223    /* Now spawn the process.  */
 224    snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
 225    snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
 226    snprintf (fd3name, sizeof fd3name, "%d", temp_fd3);
 227    snprintf (fd4name, sizeof fd4name, "%d", fd4);
 228
 229    for (i = 0; i < (argc == (restart ? 6 : 5) ? 4 : 1); i++)
 230      spargv[i] = argv[i + 1];
 231    spargv[i++] = (char *) "--direct";
 232    spargv[i++] = (char *) "--restart";
 233    spargv[i++] = fd1name;
 234    spargv[i++] = fd2name;
 235    spargv[i++] = fd3name;
 236    spargv[i++] = fd4name;
 237    spargv[i++] = name1;
 238    spargv[i] = NULL;
 239
 240    if (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ) != 0)
 241      error (EXIT_FAILURE, errno, "posix_spawn");
 242
 243    /* Same test but with a NULL pid argument.  */
 244    if (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ) != 0)
 245      error (EXIT_FAILURE, errno, "posix_spawn");
 246
 247    /* Cleanup.  */
 248    if (posix_spawn_file_actions_destroy (&actions) != 0)
 249      error (EXIT_FAILURE, errno, "posix_spawn_file_actions_destroy");
 250    free (name3_copy);
 251
 252   /* Wait for the child.  */
 253   if (waitpid (pid, &status, 0) != pid)
 254     error (EXIT_FAILURE, errno, "wrong child");
 255
 256   if (WTERMSIG (status) != 0)
 257     error (EXIT_FAILURE, 0, "Child terminated incorrectly");
 258   status = WEXITSTATUS (status);
 259
 260   return status;
 261 }