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Commit | Line | Data |
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d9a17c07 | 1 | /* Waiting for Input or Output |
2b778ceb | 2 | Copyright (C) 1991-2021 Free Software Foundation, Inc. |
d9a17c07 RM |
3 | |
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. | |
8 | ||
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. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
5a82c748 | 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
d9a17c07 RM |
16 | */ |
17 | ||
28f540f4 | 18 | /*@group*/ |
8e96ae1a | 19 | #include <errno.h> |
28f540f4 RM |
20 | #include <stdio.h> |
21 | #include <unistd.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/time.h> | |
24 | /*@end group*/ | |
25 | ||
26 | /*@group*/ | |
8e96ae1a | 27 | int |
28f540f4 RM |
28 | input_timeout (int filedes, unsigned int seconds) |
29 | { | |
30 | fd_set set; | |
31 | struct timeval timeout; | |
32 | /*@end group*/ | |
33 | ||
34 | /* Initialize the file descriptor set. */ | |
35 | FD_ZERO (&set); | |
36 | FD_SET (filedes, &set); | |
37 | ||
38 | /* Initialize the timeout data structure. */ | |
39 | timeout.tv_sec = seconds; | |
40 | timeout.tv_usec = 0; | |
41 | ||
42 | /*@group*/ | |
43 | /* @code{select} returns 0 if timeout, 1 if input available, -1 if error. */ | |
44 | return TEMP_FAILURE_RETRY (select (FD_SETSIZE, | |
45 | &set, NULL, NULL, | |
46 | &timeout)); | |
47 | } | |
48 | /*@end group*/ | |
49 | ||
50 | /*@group*/ | |
51 | int | |
52 | main (void) | |
53 | { | |
54 | fprintf (stderr, "select returned %d.\n", | |
55 | input_timeout (STDIN_FILENO, 5)); | |
56 | return 0; | |
57 | } | |
58 | /*@end group*/ |