netbsd man page for nanosleep

NANOSLEEP(2)						      BSD System Calls Manual						      NANOSLEEP(2)

NAME
     nanosleep -- high resolution sleep

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <time.h>

     int
     nanosleep(const struct timespec *rqtp, struct timespec *rmtp);

DESCRIPTION
     The nanosleep() suspends execution of the calling process until either the number of seconds and nanoseconds specified by rqtp 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 sus-
     pension time may be longer than requested due to the scheduling of other activity by the system.  The struct timespec is described in
     timespec(3).

RETURN VALUES
     If the nanosleep() function returns because the requested time has elapsed, the value returned will be zero.

     If the nanosleep() function returns due to the delivery of a signal, the value returned will be the -1, and the global variable errno will be
     set to indicate the interruption.	If rmtp is non-NULL, the timespec structure it references is updated to contain the unslept amount (the
     request time minus the time actually slept).

ERRORS
     If any of the following conditions occur, the nanosleep function shall return -1 and set errno to the corresponding value.

     [EFAULT]		Either rqtp or rmtp points to memory that is not a valid part of the process address space.

     [EINTR]		nanosleep was interrupted by the delivery of a signal.

     [EINVAL]		rqtp specified a nanosecond value less than zero or greater than 1000 million.

     [ENOSYS]		nanosleep is not supported by this implementation.

SEE ALSO
     sleep(3), timespec(3)

STANDARDS
     The nanosleep() function conforms to IEEE Std 1003.1b-1993 (``POSIX.1'').

BSD
								   May 17, 2010 							       BSD