NAME
ualarm —
schedule signal after specified
time
SYNOPSIS
#include
<unistd.h>
useconds_t
ualarm(useconds_t
microseconds, useconds_t
interval);
DESCRIPTION
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).
RETURN VALUES
When the signal has successfully been caught,
ualarm() returns the amount of time left on the
clock. The maximum value for microseconds allowed is
2147483647.
SEE ALSO
getitimer(2), setitimer(2), sigaction(2), alarm(3), signal(3), sigpause(3), sigvec(3), sleep(3), usleep(3)
STANDARDS
The ualarm() function conforms to
X/Open Portability Guide Issue 4, Version 2
(“XPG4.2”).
HISTORY
The ualarm() function appeared in
4.3BSD.