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

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UALARM(3)			   BSD Library Functions Manual 			UALARM(3)

NAME
     ualarm -- schedule signal after specified time

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     useconds_t
     ualarm(useconds_t microseconds, useconds_t interval);

DESCRIPTION
     This is a simplified interface to setitimer(2).

     The ualarm() function waits a count of microseconds before asserting the terminating signal
     SIGALRM.  System activity or time used in processing the call may cause a slight delay.

     If the interval argument is non-zero, the SIGALRM signal will be sent to the process every
     interval microseconds after the timer expires (e.g. after microseconds microseconds have
     passed).

RETURN VALUES
     When the signal has successfully been caught, ualarm() returns the amount of time left on
     the clock.  The maximum number of microseconds allowed is 2147483647.  If there is an error
     setting the timer, ualarm() returns ((useconds_t) -1).

SEE ALSO
     getitimer(2), setitimer(2), sigaction(2), sigsuspend(2), alarm(3), signal(3), sigvec(3),
     sleep(3), usleep(3)

STANDARDS
     The ualarm() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').  However, the later
     IEEE Std 1003.1-2008 (``POSIX.1'') revision removed the function from the specification.

HISTORY
     The ualarm() function appeared in 4.3BSD.

BSD					   May 2, 2011					      BSD
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