tests/test-posix_spawn-open1.c

   1 /* Test of posix_spawn() function with 'open' action.
   2    Copyright (C) 2008-2024 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 <https://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 <stdio.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37 #include <sys/types.h>
  38 #include <sys/wait.h>
  39
  40 #define CHILD_PROGRAM_FILENAME "test-posix_spawn-open1" EXEEXT
  41 #define DATA_FILENAME "t!#$%&'()*+,-;=?@[\\]^_`{|}~.tmp"
  42 /* On Windows (including Cygwin), '*' '?' '\\' '|' cannot be used in file
  43    names.  */
  44 #if defined _WIN32 || defined __CYGWIN__
  45 # undef DATA_FILENAME
  46 # define DATA_FILENAME "t!#$%&'()+,-;=@[]^_`{}~.tmp"
  47 #endif
  48
  49 static int
  50 parent_main (void)
  51 {
  52   FILE *fp;
  53   char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL };
  54   posix_spawn_file_actions_t actions;
  55   bool actions_allocated;
  56   int err;
  57   pid_t child;
  58   int status;
  59   int exitstatus;
  60
  61   /* Create a data file with specific contents.  */
  62   fp = fopen (DATA_FILENAME, "wb");
  63   if (fp == NULL)
  64     {
  65       perror ("cannot create data file");
  66       return 1;
  67     }
  68   fwrite ("Halle Potta", 1, 11, fp);
  69   if (fflush (fp) || fclose (fp))
  70     {
  71       perror ("cannot prepare data file");
  72       return 1;
  73     }
  74
  75   /* Avoid reading from our stdin, as it could block.  */
  76   if (freopen ("/dev/null", "rb", stdin) == NULL)
  77     {
  78       perror ("cannot redirect stdin");
  79       return 1;
  80     }
  81
  82   /* Test whether posix_spawn_file_actions_addopen with this file name
  83      actually works, by spawning a child that reads from this file.  */
  84   actions_allocated = false;
  85   if ((err = posix_spawn_file_actions_init (&actions)) != 0
  86       || (actions_allocated = true,
  87           (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0
  88           || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
  89     {
  90       if (actions_allocated)
  91         posix_spawn_file_actions_destroy (&actions);
  92       errno = err;
  93       perror ("subprocess failed");
  94       return 1;
  95     }
  96   posix_spawn_file_actions_destroy (&actions);
  97   status = 0;
  98   while (waitpid (child, &status, 0) != child)
  99     ;
 100   if (!WIFEXITED (status))
 101     {
 102       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 103       return 1;
 104     }
 105   exitstatus = WEXITSTATUS (status);
 106   if (exitstatus != 0)
 107     {
 108       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 109       return 1;
 110     }
 111   return 0;
 112 }
 113
 114 static int
 115 child_main (void)
 116 {
 117   char buf[1024];
 118
 119   /* See if reading from STDIN_FILENO yields the expected contents.  */
 120   if (fread (buf, 1, sizeof (buf), stdin) == 11
 121       && memcmp (buf, "Halle Potta", 11) == 0)
 122     return 0;
 123   else
 124     return 2;
 125 }
 126
 127 static void
 128 cleanup_then_die (int sig)
 129 {
 130   /* Clean up data file.  */
 131   unlink (DATA_FILENAME);
 132
 133   /* Re-raise the signal and die from it.  */
 134   signal (sig, SIG_DFL);
 135   raise (sig);
 136 }
 137
 138 int
 139 main (int argc, char *argv[])
 140 {
 141   int exitstatus;
 142
 143   if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
 144     {
 145       /* This is the parent process.  */
 146       signal (SIGINT, cleanup_then_die);
 147       signal (SIGTERM, cleanup_then_die);
 148       #ifdef SIGHUP
 149       signal (SIGHUP, cleanup_then_die);
 150       #endif
 151
 152       exitstatus = parent_main ();
 153     }
 154   else
 155     {
 156       /* This is the child process.  */
 157
 158       exitstatus = child_main ();
 159     }
 160   unlink (DATA_FILENAME);
 161   return exitstatus;
 162 }