kc3-lang/gnulib/tests/test-popen.h

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-popen.h

• /* Test of opening a subcommand stream.
     Copyright (C) 2009-2025 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 Eric Blake <ebb9@byu.net>, 2009.  */
  
  /* Include <config.h> and a form of <stdio.h> first.  */
  
  /* Helpers.  */
  #include <stdlib.h>
  #include <string.h>
  #include <sys/wait.h>
  #include <unistd.h>
  
  #include "macros.h"
  
  int
  main (int argc, char **argv)
  {
    size_t len;
    char *cmd;
    int i;
  
    /* Children - use the pipe.  */
    if (argc > 1)
      {
        if (*argv[1] == 'r') /* Parent is reading, so we write.  */
          ASSERT (putchar ('c') == 'c');
        else /* Parent is writing, so we read.  */
          ASSERT (getchar () == 'p');
        /* Test that parent can read non-zero status.  */
        return 42;
      }
  
    /* Parent - create read and write child, once under normal
       circumstances and once with stdin and stdout closed.  */
    len = strlen (argv[0]);
    cmd = malloc (len + 3); /* Adding " r" and NUL.  */
    ASSERT (cmd);
    /* We count on argv[0] not containing any shell metacharacters.  */
    strcpy (cmd, argv[0]);
    cmd[len] = ' ';
    cmd[len + 2] = '\0';
    for (i = 0; i < 2; i++)
      {
        FILE *child;
        int status;
  
        if (i)
          {
            ASSERT (fclose (stdin) == 0);
            ASSERT (fclose (stdout) == 0);
          }
  
        cmd[len + 1] = 'r';
        ASSERT (child = popen (cmd, "r"));
        ASSERT (fgetc (child) == 'c');
        status = pclose (child);
        ASSERT (WIFEXITED (status));
        ASSERT (WEXITSTATUS (status) == 42);
        if (i)
          {
            ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
            ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
          }
  
        cmd[len + 1] = 'w';
        ASSERT (child = popen (cmd, "w"));
        ASSERT (fputc ('p', child) == 'p');
        status = pclose (child);
        ASSERT (WIFEXITED (status));
        ASSERT (WEXITSTATUS (status) == 42);
        if (i)
          {
            ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
            ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
          }
      }
    free (cmd);
    return test_exit_status;
  }
  

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