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UALARM(3)	       FreeBSD 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	number of microseconds have passed).

     Due to setitimer(2) restriction the maximum number	of microseconds	and
     interval is limited to 100000000000000 (in	case this value	fits in	the
     unsigned integer).

RETURN VALUES
     When the signal has successfully been caught, ualarm() returns the	amount
     of	time left on the clock.

NOTES
     A microsecond is 0.000001 seconds.

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

HISTORY
     The ualarm() function appeared in 4.3BSD.

FreeBSD	10.1			April 19, 1994			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | NOTES | SEE ALSO | HISTORY

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