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manual/examples/select.c
59 строк
2 KB
Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Waiting for Input or Output Copyright (C) 1991-2026 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, see <https://www.gnu.org/licenses/>. */ /*@group*/ #define _GNU_SOURCE 1 #include <errno.h> #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/select.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*/