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/* Test of SIGPIPE handling.
Copyright (C) 2008-2020 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, see <https://www.gnu.org/licenses/>. */
#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>
#include "macros.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);
}
}
}
}
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