nanosleep man page on FreeBSD

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

NAME
     nanosleep — suspend process execution for an interval measured in
     nanoseconds

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <time.h>

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

DESCRIPTION
     The nanosleep() system call causes the calling thread to sleep until the
     time interval specified by rqtp has elapsed.  An unmasked signal will
     cause it to terminate the sleep early, regardless of the SA_RESTART value
     on the interrupting signal.

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

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

ERRORS
     The nanosleep() system call fails if:

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

     [EINTR]		The nanosleep() system call was interrupted by the
			delivery of a signal.

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

     [ENOSYS]		The nanosleep() system call is not supported by this
			implementation.

SEE ALSO
     sigsuspend(2), sleep(3)

STANDARDS
     The nanosleep() system call conforms to IEEE Std 1003.1b-1993
     (“POSIX.1”).

BSD				April 17, 1997				   BSD
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