/* Test of SIGPIPE handling.
   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, 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, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#include <config.h>

#include <signal.h>

/* Check that SIGPIPE is defined.  */
int s = SIGPIPE;

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void
handler (int sig)
{
  exit (0);
}

int
main (int argc, char **argv)
{
  char mode = argv[1][0];

  switch (mode)
    {
    case 'A': signal (SIGPIPE, SIG_DFL); break;
    case 'B': signal (SIGPIPE, SIG_IGN); break;
    case 'C': signal (SIGPIPE, handler); break;
    }

  /* Produce infinite output.  Since it is piped into "head -1", the writes
     must ultimately fail.  */
  for (;;)
    {
      char c[2] = { 'y', '\n' };
      int ret = write (1, c, sizeof (c));
      if (ret <= 0)
	{
	  switch (mode)
	    {
	    case 'B': /* The write() call should have failed with EPIPE.  */
	      if (ret < 0 && errno == EPIPE)
		exit (0);
	      /*FALLTHROUGH*/
	    case 'A': /* The process should silently die.  */
	    case 'C': /* The handler should have been called.  */
	      fprintf (stderr, "write() returned %d with error %d.\n", ret, errno);
	      exit (1);
	    }
	}
    }
}
