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NetBSD 6.1.5 - man page for usleep (netbsd section 3)

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

     usleep -- suspend execution for interval of microseconds

     Standard C Library (libc, -lc)

     #include <unistd.h>

     usleep(useconds_t microseconds);

     The usleep() function suspends execution of the calling process until either the number of
     microseconds specified by microseconds have elapsed or a signal is delivered to the calling
     process and its action is to invoke a signal catching function or to terminate the process.
     The suspension time may be longer than requested due to the scheduling of other activity by
     the system.

     The microseconds argument must be less than 1,000,000.  If the value of microseconds is 0,
     then the call has no effect.

     On successful completion, usleep() returns 0.  Otherwise, it returns -1 and sets errno to
     indicate the error.

     The usleep() function may fail if:

     [EINVAL]		The microseconds interval specified 1,000,000 or more microseconds.

     nanosleep(2), sleep(3)

     The usleep() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').
     It later appeared in the POSIX standard, but in IEEE Std 1003.1-2004 (``POSIX.1'') it was
     marked as legacy and the use of nanosleep(2) was recommended instead.  The IEEE Std
     1003.1-2008 (``POSIX.1'') revision removed usleep() from the specification.

     The usleep() function appeared in 4.3BSD.

BSD					  April 29, 2010				      BSD
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