sleep(3) - NetBSD Manual Pages

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SLEEP(3)                  NetBSD Programmer's Manual                  SLEEP(3)


NAME

     sleep - suspend process execution for interval of seconds


SYNOPSIS

     #include <unistd.h>

     unsigned int
     sleep(unsigned int seconds);


DESCRIPTION

     The sleep() function suspends execution of the calling process until ei-
     ther the number of seconds specified by seconds have elapsed or a signal
     is delivered to the calling process and its action is to invoke a signal-
     catching function or to terminate the process.  The suspension time may
     be longer than requested due to the scheduling of other activity by the
     system.


RETURN VALUE

     If the sleep() 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 request time minus the time actually slept) in seconds.


SEE ALSO

     nanosleep(2),  usleep(3)


STANDARDS

     The sleep() function conforms to IEEE Std1003.1-1990 (``POSIX'').


HISTORY

     A sleep() function appeared in Version 7 AT&T UNIX.

4.4BSD                           June 4, 1993                                1