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

NAME
     nnaannoosslleeeepp - suspend thread execution for an interval measured in
     nanoseconds

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

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

DESCRIPTION
     The nnaannoosslleeeepp() function causes the calling thread to sleep for the
     amount of time specified in rqtp (the actual time slept may be longer,
     due to system latencies and possible limitations in the timer resolution
     of the hardware).  An unmasked signal will cause nnaannoosslleeeepp() to terminate
     the sleep early, regardless of the SARESTART value on the interrupting
     signal.

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

     If nnaannoosslleeeepp() 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).

EERRRROORRSS
     The nnaannoosslleeeepp() call fails if:

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

     [EINTR]            nnaannoosslleeeepp() was interrupted by the delivery of a sig-
                        nal.

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

     [ENOSYS]           nnaannoosslleeeepp() is not supported by this implementation.

SEE ALSO
     sigsuspend(2), sleep(3)

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

BSD                             April 17, 1997                             BSD