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 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 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
Check Out this Related Man Page
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 pro-
cessing 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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