kc3-lang/gnulib/tests/test-passfd.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-passfd.c

• /* Test of passing file descriptors.
     Copyright (C) 2011-2023 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/>.  */
  
  #include <config.h>
  
  #include "passfd.h"
  
  #include <errno.h>
  #include <fcntl.h>
  #include <signal.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <sys/stat.h>
  #include <sys/wait.h>
  
  #include "macros.h"
  
  int
  main ()
  {
  #if HAVE_SOCKETPAIR
    int pair[2];
    int ret;
    pid_t pid;
    int status;
    int fdnull;
    int fd;
    struct stat st;
  
  # if HAVE_DECL_ALARM
    /* Avoid hanging on failure.  */
    int alarm_value = 5;
    signal (SIGALRM, SIG_DFL);
    alarm (alarm_value);
  # endif
  
    fdnull = open ("/dev/null", O_RDWR);
    if (fdnull < 0)
      {
        perror ("Could not open /dev/null");
        return 1;
      }
  
    ret = socketpair (AF_UNIX, SOCK_STREAM, 0, pair);
    if (ret < 0)
      {
        perror ("socket pair failed");
        return 2;
      }
  
    pid = fork ();
    if (pid == -1)
      {
        perror ("fork");
        return 3;
      }
    if (pid == 0)
      {
        ret = sendfd (pair[1], fdnull);
        if (ret == -1)
          {
            perror ("sendfd");
            return 64;
          }
        return 0;
      }
    /* father */
    else
      {
        ASSERT (close (pair[1]) == 0);
        fd = recvfd (pair[0], 0);
        if (fd == -1)
          {
            perror ("recvfd");
            return 16;
          }
        ret = waitpid (pid, &status, 0);
        if (ret == -1)
          {
            perror ("waitpid");
            return 17;
          }
        ASSERT (ret == pid);
  
        if (!WIFEXITED (status))
          {
            fprintf (stderr, "Child does not normally exit\n");
            return 65;
          }
        ret = WEXITSTATUS (status);
        if (ret != 0)
          {
            fprintf (stderr, "Send fd fail\n");
            return ret;
          }
  
        /* try to stat new fd */
        ret = fstat (fd, &st);
        if (ret < 0)
          {
            perror ("fstat");
            return 80;
          }
  
        /* Check behavior when sender no longer around */
        errno = 0;
        fd = recvfd (pair[0], 0);
        ASSERT (fd == -1);
        ASSERT (errno == ENOTCONN);
  
        return 0;
      }
  #else
    errno = 0;
    ASSERT(sendfd (0, 0) == -1);
    ASSERT(errno == ENOSYS);
  
    errno = 0;
    ASSERT(recvfd (0, 0) == -1);
    ASSERT(errno == ENOSYS);
  
    fputs ("skipping test: socketpair not supported on this system\n",
           stderr);
    return 77;
  #endif
  }
  

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