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 useconds, useconds_t interval);
DESCRIPTION
This is a simplified interface to setitimer(2).
The ualarm() function waits a count of useconds before asserting the ter-
minating 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 useconds number of microseconds have passed).
Due to a setitimer(2) restriction, the maximum number of useconds and
interval is limited to 100,000,000,000,000 (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), sigpause(2), sigvec(2), alarm(3), signal(3),
sleep(3), usleep(3)
HISTORY
The ualarm() function appeared in 4.3BSD.
BSD April 19, 1994 BSD
Mac OS X 10.8 - Generated Fri Aug 31 16:26:39 CDT 2012