1 /* Waiting for Input or Output
2 Copyright (C) 1991-2019 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
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/>.
22 #include <sys/types.h>
28 input_timeout (int filedes, unsigned int seconds)
31 struct timeval timeout;
34 /* Initialize the file descriptor set. */
36 FD_SET (filedes, &set);
38 /* Initialize the timeout data structure. */
39 timeout.tv_sec = seconds;
43 /* @code{select} returns 0 if timeout, 1 if input available, -1 if error. */
44 return TEMP_FAILURE_RETRY (select (FD_SETSIZE,
54 fprintf (stderr, "select returned %d.\n",
55 input_timeout (STDIN_FILENO, 5));