1 /* Test of SIGPIPE handling.
2 Copyright (C) 2008-2021 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
21 /* Check that SIGPIPE is defined. */
38 main (int argc, char **argv)
40 char mode = argv[1][0];
44 case 'A': signal (SIGPIPE, SIG_DFL); break;
45 case 'B': signal (SIGPIPE, SIG_IGN); break;
46 case 'C': signal (SIGPIPE, handler); break;
49 /* Produce infinite output. Since it is piped into "head -1", the writes
50 must ultimately fail. */
53 char c[2] = { 'y', '\n' };
54 int ret = write (1, c, sizeof (c));
59 case 'B': /* The write() call should have failed with EPIPE. */
60 if (ret < 0 && errno == EPIPE)
63 case 'A': /* The process should silently die. */
64 case 'C': /* The handler should have been called. */
65 fprintf (stderr, "write() returned %d with error %d.\n", ret, errno);