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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 process to sleep for the specified
     time.  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
     structure 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”).