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FreeBSD 11.0 - man page for usleep (freebsd section 3)

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USLEEP(3)			   BSD Library Functions Manual 			USLEEP(3)

     usleep -- suspend process execution for an interval measured in microseconds

     Standard C Library (libc, -lc)

     #include <unistd.h>

     usleep(useconds_t microseconds);

     The usleep() function suspends execution of the calling process until either microseconds
     microseconds have elapsed or a signal is delivered to the process and its action is to
     invoke a signal-catching function or to terminate the process.  System activity may lengthen
     the sleep by an indeterminate amount.

     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.

     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.

     The usleep() function will fail if:

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

     nanosleep(2), sleep(3)

     The usleep() function appeared in 4.3BSD.

BSD					February 13, 1998				      BSD
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