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alarm(3) [netbsd 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 int alarm(unsigned int 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 seconds after the call to alarm(). 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. The maximum number of seconds allowed is 2147483647. 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. If there is an error setting the timer, alarm() returns ((unsigned int) -1). SEE ALSO
setitimer(2), sigaction(2), sigsuspend(2), signal(3), sigvec(3), sleep(3), ualarm(3), usleep(3) STANDARDS
The alarm() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
An alarm() function appeared in Version 7 AT&T UNIX. BSD
April 19, 1994 BSD

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 int alarm(unsigned int 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), sigsuspend(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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