tests/test-posix_spawn-chdir.c

/* Test of posix_spawn() function with 'chdir' action.
   Copyright (C) 2008-2021 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2018.  */

#include <config.h>

#include <spawn.h>

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

#include "findprog.h"

static int
fd_safer (int fd)
{
  if (0 <= fd && fd <= 2)
    {
      int f = fd_safer (dup (fd));
      int e = errno;
      close (fd);
      errno = e;
      fd = f;
    }

  return fd;
}

static void
test (const char *pwd_prog)
{
  char *argv[2] = { (char *) "pwd", NULL };
  int ifd[2];
  sigset_t blocked_signals;
  sigset_t fatal_signal_set;
  posix_spawn_file_actions_t actions;
  bool actions_allocated;
  posix_spawnattr_t attrs;
  bool attrs_allocated;
  int err;
  pid_t child;
  int fd;
  FILE *fp;
  char line[80];
  int line_len;
  int status;
  int exitstatus;

  if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
    {
      perror ("cannot create pipe");
      exit (1);
    }
  sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
  sigemptyset (&fatal_signal_set);
  sigaddset (&fatal_signal_set, SIGINT);
  sigaddset (&fatal_signal_set, SIGTERM);
  #ifdef SIGHUP
  sigaddset (&fatal_signal_set, SIGHUP);
  #endif
  #ifdef SIGPIPE
  sigaddset (&fatal_signal_set, SIGPIPE);
  #endif
  sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
  actions_allocated = false;
  attrs_allocated = false;
  if ((err = posix_spawn_file_actions_init (&actions)) != 0
      || (actions_allocated = true,
          (err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
          || (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
          || (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
          || (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
          || (err = posix_spawn_file_actions_addchdir (&actions, "/")) != 0
          || (err = posix_spawnattr_init (&attrs)) != 0
          || (attrs_allocated = true,
              #if defined _WIN32 && !defined __CYGWIN__
              0
              #else
              (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
              || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
              #endif
             )
          || (err = posix_spawnp (&child, pwd_prog, &actions, &attrs, argv, environ)) != 0))
    {
      if (actions_allocated)
        posix_spawn_file_actions_destroy (&actions);
      if (attrs_allocated)
        posix_spawnattr_destroy (&attrs);
      sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
      errno = err;
      perror ("subprocess failed");
      exit (1);
    }
  posix_spawn_file_actions_destroy (&actions);
  posix_spawnattr_destroy (&attrs);
  sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
  close (ifd[1]);
  fd = ifd[0];
  fp = fdopen (fd, "rb");
  if (fp == NULL)
    {
      fprintf (stderr, "fdopen() failed\n");
      exit (1);
    }
  line_len = fread (line, 1, 80, fp);
  if (line_len < 2)
    {
      fprintf (stderr, "could not read expected output\n");
      exit (1);
    }
  if (!(line_len == 2 && memcmp (line, "/\n", 2) == 0))
#if defined _WIN32 && !defined __CYGWIN__
    /* If the pwd program is Cygwin's pwd, its output in the root directory is
       "/cygdrive/N", where N is a lowercase letter.  */
    if (!(line_len > 11
          && memcmp (line, "/cygdrive/", 10) == 0
          && line[10] >= 'a' && line[10] <= 'z'
          && ((line_len == 12 && line[11] == '\n')
              || (line_len == 13 && line[11] == '\r' && line[12] == '\n'))))
#endif
      {
        fprintf (stderr, "read output is not the expected output\n");
        exit (1);
      }
  fclose (fp);
  status = 0;
  while (waitpid (child, &status, 0) != child)
    ;
  if (!WIFEXITED (status))
    {
      fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
      exit (1);
    }
  exitstatus = WEXITSTATUS (status);
  if (exitstatus != 0)
    {
      fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
      exit (1);
    }
}

int
main ()
{
  test ("pwd");

  /* Verify that if a program is given as a relative file name with at least one
     slash, it is interpreted w.r.t. the current directory after chdir has been
     executed.  */
  {
    const char *abs_pwd_prog = find_in_path ("pwd");

    if (abs_pwd_prog != NULL
        && abs_pwd_prog[0] == '/'
        && abs_pwd_prog[1] != '0' && abs_pwd_prog[1] != '/')
      test (&abs_pwd_prog[1]);
  }

  return 0;
}