Logo Search packages:      
Sourcecode: coreutils version File versions  Download package

test-select-stdin.c

/* -*- buffer-read-only: t -*- vi: set ro: */
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
#line 1
/* Test of select() substitute, reading from stdin.
   Copyright (C) 2008 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>
#include <sys/time.h>
#include <unistd.h>

int
main ()
{
  printf ("Applying select() from standard input. Press Ctrl-C to abort.\n");
  for (;;)
    {
      struct timeval before;
      struct timeval after;
      unsigned long spent_usec;
      fd_set readfds;
      struct timeval timeout;
      int ret;

      gettimeofday (&before, NULL);

      FD_ZERO (&readfds);
      FD_SET (0, &readfds);
      timeout.tv_sec = 0;
      timeout.tv_usec = 500000;
      ret = select (1, &readfds, NULL, NULL, &timeout);

      gettimeofday (&after, NULL);
      spent_usec = (after.tv_sec - before.tv_sec) * 1000000
               + after.tv_usec - before.tv_usec;

      if (ret < 0)
      {
        perror ("select failed");
        exit (1);
      }
      if ((ret == 0) != ! FD_ISSET (0, &readfds))
      {
        fprintf (stderr, "incorrect return value\n");
        exit (1);
      }
      if (ret == 0)
      {
        if (spent_usec < 250000)
          {
            fprintf (stderr, "returned too early\n");
            exit (1);
          }
        /* Timeout */
        printf ("."); fflush (stdout);
      }
      else
      {
        char c;

        printf ("Input available! Trying to read 1 byte...\n");
        read (0, &c, 1);
      }
    }
}

Generated by  Doxygen 1.6.0   Back to index