ALARM(3) | Library Functions Manual | ALARM(3) |
alarm
—
#include <unistd.h>
unsigned int
alarm
(unsigned
int seconds);
The alarm
() function sets a timer to
deliver the signal SIGALRM
to the calling process
seconds after the call to
alarm
(). If an alarm has already been set with
alarm
() but has not been delivered, another call to
alarm
() will supersede the prior call. The request
alarm
(0) voids the current
alarm and the signal SIGALRM will not be delivered. The maximum number of
seconds allowed is 2147483647.
The return value of alarm
() is the amount
of time left on the timer from a previous call to
alarm
(). If no alarm is currently set, the return
value is 0. If there is an error setting the timer,
alarm
() returns ((unsigned int) -1).
alarm
() function conforms to IEEE
Std 1003.1-1990 (“POSIX.1”).
alarm
() function appeared in
Version 7 AT&T UNIX.
April 19, 1994 | NetBSD 9.0 |