Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

alarm(3) [ultrix man page]

alarm(3)						     Library Functions Manual							  alarm(3)

       alarm - schedule signal after specified time

       #include <unistd.h>

       unsigned alarm(seconds)
       unsigned seconds;

       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.

       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)


Check Out this Related Man Page

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

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
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

help me

when i use cc command to compile a C program **.c , system gave me a alarm message:optional language package not installed,please tell me how to insovle this problem? SUN system , SunWorkshop cc may be ,i don't install c language package,do i? thanks for your instruct (2 Replies)
Discussion started by: xukai
2 Replies

2. UNIX for Dummies Questions & Answers

evaluating for a number

I apologize for the simple question but can someone please help me with how to evaluate a number? I will be reading in a file and if a number is >= 100000000, I will do something, if not, I will exit the if statement. Thanks in advance (1 Reply)
Discussion started by: hedrict
1 Replies

3. Shell Programming and Scripting

Perl alarm signal

I am trying to write a signal to exit when a process times out. What I have come up with from poking around the web is this. #!/usr/bin/perl eval { local $SIG{ALRM} = sub { die "alarm clock restart" }; alarm 10; open(DSMADMC, "dsmadmc -se=tsmpc1 -id=XXXXX... (2 Replies)
Discussion started by: reggiej
2 Replies

4. Programming

Basic signal and alarm usage

I am trying to write a program that will; 1) Show the message "Snoozing now...zzzz" on the screen for 5 seconds 2) Then in the same position show the message "The ALARM is going off now!" for 5 seconds 3) Repeat 1) then 2) infinitely until user presses Ctrl C I can't make it work. Any hints... (17 Replies)
Discussion started by: enuenu
17 Replies

5. Shell Programming and Scripting

Script searchs into a file

Dear Sirs, I want to write a script as an automatic action when I receive an alarm from a specific application. There are some variables attached to this alarm, one of them is an (ID) that represents some data. Example: ID Responder COS 5 6OCT2-R50C-GZ-EG Default... (2 Replies)
Discussion started by: ahmed.zaher
2 Replies

6. Programming

Sinal-processing alarm()-function

hi programmers from all over the world, i am programming a simple program and want to deal with signals. i want to understand and work with the old signal-concept under unix, but i have a problem, hope you can help or knoew where i can get help. i use just one sig-handler, if a signal is... (1 Reply)
Discussion started by:
1 Replies

7. Shell Programming and Scripting

raise an alarm in Unix

Hi members, I am working in WebSphere in Unix environment. we are working with 500 odd servers and most of the times processes got down. Can i have any shell script through whih some popup with alarm get raised whenever some server get down. kindly help.. Thanks Rishi (1 Reply)
Discussion started by: rishi.madan
1 Replies

8. Shell Programming and Scripting

Sometimes my until loop misses it's target

Hello all, I wrote a quick function (alarm) in my bash_profile (in cygwin) for practice. It uses until loops to wait for a specified time, and once that time passes triggers a play on a mp3. Most of the time it works, however sometimes it seems like it's looping through too slowly and will miss... (1 Reply)
Discussion started by: DeCoTwc
1 Replies

9. Programming

alarm signal processing

I'm writing a function right now, and I want to set an alarm to avoid a timeout, here's the general idea of my code: int amt = -2; alarm(10); amt = read(fd, &t->buf, TASKBUFSIZ - tailpos); //do a read when the alarm goes off, i want to check the value of "amt" ... (1 Reply)
Discussion started by: liaobert
1 Replies

10. Solaris

NTP Monitorization.

Hello I wonder if there is a way to get an alarm if the ntp client cant get to the ntp server? Or if it possible to monitor the client clock and if it differs more than xxx milliseconds raize an alarm? Thanks in advance. Jan (1 Reply)
Discussion started by: vettec3
1 Replies

11. Shell Programming and Scripting

crontab+mplayer alarm clock

I'm trying to run a using crontab, which play a song as an alarm at 6.15 am. I'm using amixer so that volume increases by 10% in every loop. My script is the following. SHELL=/bin/bash PLAYER=/usr/bin/mplayer SONG=/home/hbar/Music/song.mp3 DISPLAY=:0.0 15 06 * * *... (10 Replies)
Discussion started by: hbar
10 Replies

12. UNIX for Dummies Questions & Answers

Print events from two lines with a common identifier

Hi Unix Gurus, I have a long text file, where alarms events are logged and alarm clear event are logged. Both events alarm and alarm clear has common identifier as{xxxxxxxxxx} I need to analyse the time-period for which the alarm sustained. i.e Output: timestamp from both event has... (3 Replies)
Discussion started by: vanand420
3 Replies

13. Shell Programming and Scripting

Need help in restarting process

Hi friends, I have one unix command which is used to check the network status manually. followig is the command check_Network this command give follwoing status Network 1 is ok Network 2 is ok network 3 is ok network 4 is ok . . . . Network 10 is... (8 Replies)
Discussion started by: Nakul_sh
8 Replies

14. Shell Programming and Scripting

Creating a monitoring alarm every hour in UNIX

Hi, I need to create a monitoring alarm script which would check if the log file has been updated in the last one hour or not. I tried using -cmin however, one environment supports it where as the other does not. I would really need some help here!!! (2 Replies)
Discussion started by: Ritu245
2 Replies

15. Shell Programming and Scripting

Converting seconds to time

I have a list of time spans in seconds, and want to compute the time span as hh:mm:nn I am coding in bash and have coded the following. However, the results are wrong as "%.0f" rounds the values. Example: ftm: 25793.5 tmspan(hrs,min,sec): 7.16 429.89 25793.50 hh: 7 mm: 10 ss:... (2 Replies)
Discussion started by: kristinu
2 Replies