DragonFly On-Line Manual Pages


UALARM(3)	      DragonFly Library Functions Manual	     UALARM(3)

NAME

ualarm -- schedule signal after specified time

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <unistd.h> u_int ualarm(u_int microseconds, u_int 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 value microseconds have passed). Due to setitimer(2) restriction the maximum number of microseconds and interval is limited to 100000000000000 (in case this value fit 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), signal(3), sleep(3), usleep(3)

HISTORY

The ualarm() function appeared in 4.3BSD. DragonFly 4.1 April 19, 1994 DragonFly 4.1