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 Alsogetitimer(2), sigpause(2), sigvec(2), signal(3), sleep(3)alarm(3)
Check Out this Related Man Page
ALARM(2) Linux Programmer's Manual ALARM(2)NAME
alarm - set an alarm clock for delivery of a signal
SYNOPSIS
#include <unistd.h>
unsigned int alarm(unsigned int seconds);
DESCRIPTION
alarm arranges for a SIGALRM signal to be delivered to the process in seconds seconds.
If seconds is zero, no new alarm is scheduled.
In any event any previously set alarm is cancelled.
RETURN VALUE
alarm returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no previ-
ously scheduled alarm.
NOTES
alarm and setitimer share the same timer; calls to one will interfere with use of the other.
sleep() may be implemented using SIGALRM; mixing calls to alarm() and sleep() is a bad idea.
Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.
CONFORMING TO
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
SEE ALSO setitimer(2), signal(2), sigaction(2), gettimeofday(2), select(2), pause(2), sleep(3)Linux 1993-07-21 ALARM(2)
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)
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.
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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)
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
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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)
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)
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)
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)
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)
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)
I'm trying to run a alarm.sh 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)
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)
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
.
.
.
.
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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)
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)