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69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* Test of SIGPIPE handling.
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Copyright (C) 2008-2017 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <signal.h>
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/* Check that SIGPIPE is defined. */
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int s = SIGPIPE;
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void
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handler (int sig)
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{
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exit (0);
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}
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int
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main (int argc, char **argv)
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{
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char mode = argv[1][0];
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switch (mode)
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{
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case 'A': signal (SIGPIPE, SIG_DFL); break;
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case 'B': signal (SIGPIPE, SIG_IGN); break;
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case 'C': signal (SIGPIPE, handler); break;
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}
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/* Produce infinite output. Since it is piped into "head -1", the writes
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must ultimately fail. */
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for (;;)
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{
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char c[2] = { 'y', '\n' };
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int ret = write (1, c, sizeof (c));
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if (ret <= 0)
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{
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switch (mode)
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{
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case 'B': /* The write() call should have failed with EPIPE. */
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if (ret < 0 && errno == EPIPE)
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exit (0);
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/*FALLTHROUGH*/
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case 'A': /* The process should silently die. */
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case 'C': /* The handler should have been called. */
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fprintf (stderr, "write() returned %d with error %d.\n", ret, errno);
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exit (1);
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}
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}
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}
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}
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