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41 lines
768 B
C
41 lines
768 B
C
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/*@group*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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/*@end group*/
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/*@group*/
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int
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input_timeout (int filedes, unsigned int seconds)
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{
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fd_set set;
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struct timeval timeout;
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/*@end group*/
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/* Initialize the file descriptor set. */
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FD_ZERO (&set);
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FD_SET (filedes, &set);
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/* Initialize the timeout data structure. */
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timeout.tv_sec = seconds;
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timeout.tv_usec = 0;
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/*@group*/
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/* @code{select} returns 0 if timeout, 1 if input available, -1 if error. */
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return TEMP_FAILURE_RETRY (select (FD_SETSIZE,
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&set, NULL, NULL,
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&timeout));
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}
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/*@end group*/
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/*@group*/
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int
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main (void)
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{
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fprintf (stderr, "select returned %d.\n",
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input_timeout (STDIN_FILENO, 5));
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return 0;
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}
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/*@end group*/
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