UALARM(3) | Library Functions Manual | UALARM(3) |
ualarm
—
#include <unistd.h>
useconds_t
ualarm
(useconds_t
microseconds, useconds_t
interval);
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).
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).
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.
ualarm
() function appeared in
4.3BSD.
May 2, 2011 | NetBSD 9.2 |