tests/test-posix_spawn3.c

   1 /* Test of posix_spawn() function.
   2    Copyright (C) 2008-2011 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   freopen ("/dev/null", "rb", stdin);
  79
  80   /* Test whether posix_spawn_file_actions_addopen with this file name
  81      actually works, but spawning a child that reads from this file.  */
  82   actions_allocated = false;
  83   if ((err = posix_spawn_file_actions_init (&actions)) != 0
  84       || (actions_allocated = true,
  85           (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0
  86           || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
  87     {
  88       if (actions_allocated)
  89         posix_spawn_file_actions_destroy (&actions);
  90       errno = err;
  91       perror ("subprocess failed");
  92       return 1;
  93     }
  94   posix_spawn_file_actions_destroy (&actions);
  95   status = 0;
  96   while (waitpid (child, &status, 0) != child)
  97     ;
  98   if (!WIFEXITED (status))
  99     {
 100       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 101       return 1;
 102     }
 103   exitstatus = WEXITSTATUS (status);
 104   if (exitstatus != 0)
 105     {
 106       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 107       return 1;
 108     }
 109   return 0;
 110 }
 111
 112 static int
 113 child_main (void)
 114 {
 115   char buf[1024];
 116
 117   /* See if reading from STDIN_FILENO yields the expected contents.  */
 118   if (fread (buf, 1, sizeof (buf), stdin) == 11
 119       && memcmp (buf, "Halle Potta", 11) == 0)
 120     return 0;
 121   else
 122     return 2;
 123 }
 124
 125 static void
 126 cleanup_then_die (int sig)
 127 {
 128   /* Clean up data file.  */
 129   unlink (DATA_FILENAME);
 130
 131   /* Re-raise the signal and die from it.  */
 132   signal (sig, SIG_DFL);
 133   raise (sig);
 134 }
 135
 136 int
 137 main (int argc, char *argv[])
 138 {
 139   int exitstatus;
 140
 141   if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
 142     {
 143       /* This is the parent process.  */
 144       signal (SIGINT, cleanup_then_die);
 145       signal (SIGTERM, cleanup_then_die);
 146       #ifdef SIGHUP
 147       signal (SIGHUP, cleanup_then_die);
 148       #endif
 149
 150       exitstatus = parent_main ();
 151     }
 152   else
 153     {
 154       /* This is the child process.  */
 155
 156       exitstatus = child_main ();
 157     }
 158   unlink (DATA_FILENAME);
 159   return exitstatus;
 160 }