kc3-lang/gnulib/tests/test-select-fd.c

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• Hash : 1602f0af
  Author :
  Date : 2012-01-01T10:04:58
  

  maint: update all copyright year number ranges
  
  Run "make update-copyright".
  

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• tests/test-select-fd.c

• /* Test of select() substitute, reading or writing from a given file descriptor.
     Copyright (C) 2008-2012 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 <http://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
  
  #include <config.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <sys/select.h>
  
  int
  main (int argc, char *argv[])
  {
    if (argc == 4)
      {
        char mode = argv[1][0];
  
        if (mode == 'r' || mode == 'w')
          {
            int fd = atoi (argv[2]);
  
            if (fd >= 0)
              {
                const char *result_file_name = argv[3];
                FILE *result_file = fopen (result_file_name, "wb");
  
                if (result_file != NULL)
                  {
                    fd_set fds;
                    struct timeval timeout;
                    int ret;
  
                    FD_ZERO (&fds);
                    FD_SET (fd, &fds);
                    timeout.tv_sec = 0;
                    timeout.tv_usec = 10000;
                    ret = (mode == 'r'
                           ? select (fd + 1, &fds, NULL, NULL, &timeout)
                           : select (fd + 1, NULL, &fds, NULL, &timeout));
                    if (ret < 0)
                      {
                        perror ("select failed");
                        exit (1);
                      }
                    if ((ret == 0) != ! FD_ISSET (fd, &fds))
                      {
                        fprintf (stderr, "incorrect return value\n");
                        exit (1);
                      }
                    fprintf (result_file, "%d\n", ret);
                    exit (0);
                  }
              }
          }
      }
    fprintf (stderr, "Usage: test-select-fd mode fd result-file-name\n");
    exit (1);
  }
  

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