usleep man page on BSDi

usleep man page on BSDi

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

NAME
     sleep, usleep - suspend process execution

SYNOPSIS
     #include <unistd.h>

     unsigned int
     sleep(unsigned int seconds);

     void
     usleep(unsigned int microseconds);

DESCRIPTION
     The sleep() function suspends execution of the calling process for
     seconds of clock time, or until interrupted by a signal.

     The usleep() function suspends execution of the calling process for
     microseconds of clock time, or until interrupted by a signal.

     System activity may lengthen the suspension.

RETURN VALUES
     The sleep() function returns 0, or if interrupted before seconds, the
     amount not slept (the requested time minus the time actually slept) in
     seconds.

SEE ALSO
     select(2),	 setitimer(2)

COMPATIBILITY
     Previous implementations of sleep() and usleep() re-suspended the process
     if interrupted by a signal.  This implementation has been changed to re-
     turn in that case, to conform to IEEE Std1003.1-1988 (``POSIX'').

HISTORY
     A usleep() function appeared in 4.3BSD.
     A sleep() function appeared in Version 7 AT&T UNIX.

BSDI BSD/OS			March 25, 1995				     1

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