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alarm(3) [ultrix man page]

alarm(3)						     Library Functions Manual							  alarm(3)

Name
       alarm - schedule signal after specified time

Syntax
       #include <unistd.h>

       unsigned alarm(seconds)
       unsigned seconds;

Description
       The  subroutine	causes signal SIGALRM, see to be sent to the invoking process in a number of seconds given by the argument.  Unless caught
       or ignored, the signal terminates the process.

       The requests are not stacked.  Successive calls reset the alarm clock.  If the argument is 0, any request is canceled.  Because of schedul-
       ing delays, resumption of execution of when the signal is caught may be delayed an arbitrary amount.  The longest specifiable delay time is
       100000000 seconds. Values larger than 100000000 will be silently rounded down to 100000000.

       The return value is the amount of time previously remaining in the alarm clock.

Environment
       When your program is compiled using the System V environment, rounds up any positive fraction of a second to the next second.

       When your program is compiled using the POSIX environment, takes a parameter of type unsigned, and returns a value of type unsigned.

See Also
       getitimer(2), sigpause(2), sigvec(2), signal(3), sleep(3)

																	  alarm(3)

Check Out this Related Man Page

ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME
alarm -- set signal timer alarm LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> unsigned alarm(unsigned seconds); DESCRIPTION
This interface is made obsolete by setitimer(2). The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds. If an alarm has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call. The request alarm(0) voids the current alarm and the signal SIGALRM will not be delivered. Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000. RETURN VALUES
The return value of alarm() is the amount of time left on the timer from a previous call to alarm(). If no alarm is currently set, the return value is 0. SEE ALSO
setitimer(2), sigaction(2), sigpause(2), sigvec(2), signal(3), sleep(3), ualarm(3), usleep(3) HISTORY
An alarm() function appeared in Version 7 AT&T UNIX. BSD
April 19, 1994 BSD
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