|
NAMEsleep —
suspend thread execution for an interval measured in
seconds
LIBRARYStandard C Library (libc, -lc)SYNOPSIS#include <unistd.h>
unsigned int
DESCRIPTIONThesleep () function suspends execution of the calling
thread until either seconds seconds have elapsed or a
signal is delivered to the thread and its action is to invoke a
signal-catching function or to terminate the thread or process. System
activity may lengthen the sleep by an indeterminate amount.
This function is implemented using nanosleep(2) by pausing for seconds seconds or until a signal occurs. Consequently, in this implementation, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM. RETURN VALUESIf thesleep () function returns because the requested
time has elapsed, the value returned will be zero. If the
sleep () function returns due to the delivery of a
signal, the value returned will be the unslept amount (the requested time
minus the time actually slept) in seconds.
SEE ALSOnanosleep(2), usleep(3)STANDARDSThesleep () function conforms to IEEE
Std 1003.1-1990 (“POSIX.1”).
HISTORYAsleep () function appeared in
Version 7 AT&T UNIX.
Visit the GSP FreeBSD Man Page Interface. |