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NetBSD 6.1.5 - man page for sleep (netbsd section 3)

SLEEP(3)			   BSD Library Functions Manual 			 SLEEP(3)

NAME
     sleep -- suspend process execution for interval of seconds

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     unsigned int
     sleep(unsigned int seconds);

DESCRIPTION
     The sleep() function suspends execution of the calling process until either 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 VALUES
     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 sec-
     onds.

SEE ALSO
     nanosleep(2), usleep(3)

STANDARDS
     The sleep() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

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

BSD					   June 4, 1993 				      BSD


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