tests/test-posix_spawn4.c

   1 /* Test of posix_spawn() function with 'chdir' action.
   2    Copyright (C) 2008-2020 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>, 2018.  */
  18
  19 #include <config.h>
  20
  21 #include <spawn.h>
  22
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33
  34 #include "findprog.h"
  35
  36 static int
  37 fd_safer (int fd)
  38 {
  39   if (0 <= fd && fd <= 2)
  40     {
  41       int f = fd_safer (dup (fd));
  42       int e = errno;
  43       close (fd);
  44       errno = e;
  45       fd = f;
  46     }
  47
  48   return fd;
  49 }
  50
  51 static void
  52 test (const char *pwd_prog)
  53 {
  54   char *argv[2] = { (char *) "pwd", NULL };
  55   int ifd[2];
  56   sigset_t blocked_signals;
  57   sigset_t fatal_signal_set;
  58   posix_spawn_file_actions_t actions;
  59   bool actions_allocated;
  60   posix_spawnattr_t attrs;
  61   bool attrs_allocated;
  62   int err;
  63   pid_t child;
  64   int fd;
  65   FILE *fp;
  66   char line[80];
  67   int status;
  68   int exitstatus;
  69
  70   if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
  71     {
  72       perror ("cannot create pipe");
  73       exit (1);
  74     }
  75   sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
  76   sigemptyset (&fatal_signal_set);
  77   sigaddset (&fatal_signal_set, SIGINT);
  78   sigaddset (&fatal_signal_set, SIGTERM);
  79   sigaddset (&fatal_signal_set, SIGHUP);
  80   sigaddset (&fatal_signal_set, SIGPIPE);
  81   sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
  82   actions_allocated = false;
  83   attrs_allocated = false;
  84   if ((err = posix_spawn_file_actions_init (&actions)) != 0
  85       || (actions_allocated = true,
  86           (err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
  87           || (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
  88           || (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
  89           || (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
  90           || (err = posix_spawn_file_actions_addchdir (&actions, "/")) != 0
  91           || (err = posix_spawnattr_init (&attrs)) != 0
  92           || (attrs_allocated = true,
  93               (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
  94               || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0)
  95           || (err = posix_spawnp (&child, pwd_prog, &actions, &attrs, argv, environ)) != 0))
  96     {
  97       if (actions_allocated)
  98         posix_spawn_file_actions_destroy (&actions);
  99       if (attrs_allocated)
 100         posix_spawnattr_destroy (&attrs);
 101       sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
 102       errno = err;
 103       perror ("subprocess failed");
 104       exit (1);
 105     }
 106   posix_spawn_file_actions_destroy (&actions);
 107   posix_spawnattr_destroy (&attrs);
 108   sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
 109   close (ifd[1]);
 110   fd = ifd[0];
 111   fp = fdopen (fd, "r");
 112   if (fp == NULL)
 113     {
 114       fprintf (stderr, "fdopen() failed\n");
 115       exit (1);
 116     }
 117   if (fread (line, 1, 80, fp) < 2)
 118     {
 119       fprintf (stderr, "could not read expected output\n");
 120       exit (1);
 121     }
 122   if (memcmp (line, "/\n", 2) != 0)
 123     {
 124       fprintf (stderr, "read output is not the expected output");
 125       exit (1);
 126     }
 127   fclose (fp);
 128   status = 0;
 129   while (waitpid (child, &status, 0) != child)
 130     ;
 131   if (!WIFEXITED (status))
 132     {
 133       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 134       exit (1);
 135     }
 136   exitstatus = WEXITSTATUS (status);
 137   if (exitstatus != 0)
 138     {
 139       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 140       exit (1);
 141     }
 142 }
 143
 144 int
 145 main ()
 146 {
 147   test ("pwd");
 148
 149   /* Verify that if a program is given as a relative file name with at least one
 150      slash, it is interpreted w.r.t. the current directory after chdir has been
 151      executed.  */
 152   {
 153     const char *abs_pwd_prog = find_in_path ("pwd");
 154
 155     if (abs_pwd_prog != NULL
 156         && abs_pwd_prog[0] == '/'
 157         && abs_pwd_prog[1] != '0' && abs_pwd_prog[1] != '/')
 158       test (&abs_pwd_prog[1]);
 159   }
 160
 161   return 0;
 162 }