tests/test-posix_spawn3.c

   1 /* Test of posix_spawn() function.
   2    Copyright (C) 2008-2017 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
  18
  19 /* Test whether posix_spawn_file_actions_addopen supports filename arguments
  20    that contain special characters such as '*'.  */
  21
  22 #include <config.h>
  23
  24 #include <spawn.h>
  25
  26 #include "signature.h"
  27 SIGNATURE_CHECK (posix_spawn, int, (pid_t *, char const *,
  28                                     posix_spawn_file_actions_t const *,
  29                                     posix_spawnattr_t const *,
  30                                     char *const[], char *const[]));
  31 #include <errno.h>
  32 #include <fcntl.h>
  33 #include <signal.h>
  34 #include <stdbool.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <sys/types.h>
  39 #include <sys/wait.h>
  40
  41 extern char **environ;
  42
  43 #define CHILD_PROGRAM_FILENAME "test-posix_spawn3"
  44 #define DATA_FILENAME "t!#$%&'()*+,-;=?@[\\]^_`{|}~.tmp"
  45 /* On Cygwin, '*' '?' '\\' '|' cannot be used in file names.  */
  46 #if defined __CYGWIN__
  47 # undef DATA_FILENAME
  48 # define DATA_FILENAME "t!#$%&'()+,-;=@[]^_`{}~.tmp"
  49 #endif
  50
  51 static int
  52 parent_main (void)
  53 {
  54   FILE *fp;
  55   char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL };
  56   posix_spawn_file_actions_t actions;
  57   bool actions_allocated;
  58   int err;
  59   pid_t child;
  60   int status;
  61   int exitstatus;
  62
  63   /* Create a data file with specific contents.  */
  64   fp = fopen (DATA_FILENAME, "wb");
  65   if (fp == NULL)
  66     {
  67       perror ("cannot create data file");
  68       return 1;
  69     }
  70   fwrite ("Halle Potta", 1, 11, fp);
  71   if (fflush (fp) || fclose (fp))
  72     {
  73       perror ("cannot prepare data file");
  74       return 1;
  75     }
  76
  77   /* Avoid reading from our stdin, as it could block.  */
  78   if (freopen ("/dev/null", "rb", stdin) == NULL)
  79     {
  80       perror ("cannot redirect stdin");
  81       return 1;
  82     }
  83
  84   /* Test whether posix_spawn_file_actions_addopen with this file name
  85      actually works, but spawning a child that reads from this file.  */
  86   actions_allocated = false;
  87   if ((err = posix_spawn_file_actions_init (&actions)) != 0
  88       || (actions_allocated = true,
  89           (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0
  90           || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
  91     {
  92       if (actions_allocated)
  93         posix_spawn_file_actions_destroy (&actions);
  94       errno = err;
  95       perror ("subprocess failed");
  96       return 1;
  97     }
  98   posix_spawn_file_actions_destroy (&actions);
  99   status = 0;
 100   while (waitpid (child, &status, 0) != child)
 101     ;
 102   if (!WIFEXITED (status))
 103     {
 104       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 105       return 1;
 106     }
 107   exitstatus = WEXITSTATUS (status);
 108   if (exitstatus != 0)
 109     {
 110       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 111       return 1;
 112     }
 113   return 0;
 114 }
 115
 116 static int
 117 child_main (void)
 118 {
 119   char buf[1024];
 120
 121   /* See if reading from STDIN_FILENO yields the expected contents.  */
 122   if (fread (buf, 1, sizeof (buf), stdin) == 11
 123       && memcmp (buf, "Halle Potta", 11) == 0)
 124     return 0;
 125   else
 126     return 2;
 127 }
 128
 129 static void
 130 cleanup_then_die (int sig)
 131 {
 132   /* Clean up data file.  */
 133   unlink (DATA_FILENAME);
 134
 135   /* Re-raise the signal and die from it.  */
 136   signal (sig, SIG_DFL);
 137   raise (sig);
 138 }
 139
 140 int
 141 main (int argc, char *argv[])
 142 {
 143   int exitstatus;
 144
 145   if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
 146     {
 147       /* This is the parent process.  */
 148       signal (SIGINT, cleanup_then_die);
 149       signal (SIGTERM, cleanup_then_die);
 150       #ifdef SIGHUP
 151       signal (SIGHUP, cleanup_then_die);
 152       #endif
 153
 154       exitstatus = parent_main ();
 155     }
 156   else
 157     {
 158       /* This is the child process.  */
 159
 160       exitstatus = child_main ();
 161     }
 162   unlink (DATA_FILENAME);
 163   return exitstatus;
 164 }