USLEP(3)                BSD Library Functions Manual                USLEP(3)

NAME
     usleep -- suspend thread execution for an interval measured in microsec-
     onds

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##include <>

     int
     usleep(usecondst microseconds);

DESCRIPTION
     The usleep() function suspends execution of the calling thread until
     either microseconds microseconds have elapsed or a signal is delivered to
     the thread and its action is to invoke a signal-catching function or to
     terminate the thread or process.  The actual time slept may be longer,
     due to system latencies and possible limitations in the timer resolution
     of the hardware.

     This function is implemented using nanosleep(2) by pausing for
     microseconds microseconds or until a signal occurs.  Consequently, in
     this implementation, sleeping has no effect on the state of process
     timers, and there is no special handling for SIGALRM.

RETURN VALUES
     The usleep() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERORS
     The usleep() function will fail if:

     [EINTR]            A signal was delivered to the process and its action
                        was to invoke a signal-catching function.

SEE ALSO
     nanosleep(2), sleep(3)

HISTORY
     The usleep() function appeared in 4.3BSD.

BSD                            February 13, 1998                           BSD