hpux man page for nanosleep

nanosleep(2)							System Calls Manual						      nanosleep(2)

NAME
       nanosleep() - high resolution sleep

SYNOPSIS
DESCRIPTION
       The function causes the current thread to be suspended from execution until either the time interval specified by the argument has elapsed,
       or a signal is delivered to the calling thread and its action is to invoke a signal-catching function or to  terminate  the  process.   The
       suspension  time  may be longer than that requested because the argument value is rounded up to an integer multiple of the sleep resolution
       or because of the scheduling of other activity by the system.  However, with the exception of the case of being interrupted  by	a  signal,
       the suspension time will not be less than the time specified by as measured by the system clock,

       The use of the function has no effect on the action or blockage of any signal.

RETURN VALUE
       If the function returns because the requested time has elapsed, its return value is zero.

       If  the function returns because it has been interrupted by a signal, the function returns a value of -1 and sets to indicate the interrup-
       tion.  If the argument is non-NULL, the timespec structure referenced by it is updated to contain the  amount  of  time	remaining  in  the
       interval (the requested time minus the time actually slept).  If the argument is NULL, the remaining time is not returned.

       If fails, it returns a value of -1 and sets to indicate the error.

ERRORS
       If any of the following conditions occur, the function returns -1 and sets (see errno(2)) to the corresponding value:

	      The	  or arguments specify an invalid address.

	      was interrupted by a signal.

	      The	  argument specified a nanosecond value less than zero or greater than or equal to 1000 million.

	      The function
			  is not supported by this implementation.

EXAMPLES
       Suspend execution of the current thread for half a second:

AUTHOR
       was derived from the proposed IEEE POSIX P1003.4 Standard, Draft 14.

SEE ALSO
       clocks(2), timers(2), sleep(3C).

STANDARDS CONFORMANCE
																      nanosleep(2)