| /* Waiting for Input or Output |
| Copyright (C) 1991-2014 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 2 |
| of the License, 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, if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /*@group*/ |
| #include <errno.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/time.h> |
| /*@end group*/ |
| |
| /*@group*/ |
| int |
| input_timeout (int filedes, unsigned int seconds) |
| { |
| fd_set set; |
| struct timeval timeout; |
| /*@end group*/ |
| |
| /* Initialize the file descriptor set. */ |
| FD_ZERO (&set); |
| FD_SET (filedes, &set); |
| |
| /* Initialize the timeout data structure. */ |
| timeout.tv_sec = seconds; |
| timeout.tv_usec = 0; |
| |
| /*@group*/ |
| /* @code{select} returns 0 if timeout, 1 if input available, -1 if error. */ |
| return TEMP_FAILURE_RETRY (select (FD_SETSIZE, |
| &set, NULL, NULL, |
| &timeout)); |
| } |
| /*@end group*/ |
| |
| /*@group*/ |
| int |
| main (void) |
| { |
| fprintf (stderr, "select returned %d.\n", |
| input_timeout (STDIN_FILENO, 5)); |
| return 0; |
| } |
| /*@end group*/ |