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
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)
I have a Solaris 2.6 machine and I execute the following:
while
do
echo looping
sleep 15
done
I would assume the looping would be printed every 15 seconds but it doesn't. consecutive looping gets printed without a 15 second gap. Any idea what might be the reason ?
Thanks (9 Replies)
I'm trying generate an interrupt every 1 seconds using itimer and My clock is not running. This is what i did :
printf("about to sleep for 1 second \n");
signal(SIGALRM, wakeup);
//myTimer.it_interval.tv_sec=0;
//myTimer.it_interval.tv_usec =0;
... (5 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
I can't make it work. Any hints... (17 Replies)
I have a raw data with some formats:
* 11 REPT:CELL 55 ASSEMBLAGE 1 ALARM SCANNING
SCAN POINT: ALARM GROUP 2, ALARM ID 11
ALARM: RECTIFIER MINOR ALARM
STATE: OFF NORMAL
11 REPT:CELL 55 ASSEMBLAGE 1 ALARM SCANNING
SCAN POINT: ALARM GROUP 2, ALARM ID 11
ALARM:... (3 Replies)
I have written a program to demonstrate a problem I have encountered when using BSD style asynchronous input using the O_ASYNC flag in conjunction with a real time interval timer sending regular SIGALRM signals to the program. The SIGIO handler obeys all safe practices, using only an atomic update... (8 Replies)
Hello all,
I am starting to learn signal handling in Linux and have been trying out some simple codes to deal with SIGALRM. The code shown below sets a timer to count down. When the timer is finished a SIGALRM is produced. The handler for the signal just increments a variable called count. This... (7 Replies)
Dear,
I have a alarm text file, containing minor and major alarms, i am intrested in Mojor alarm with its alarm header and next four lines in seperate file....
Can anybody help me with this below is the alarm file output.
:SEV="MAJOR":
Object-Instance %
unit-type % bts nbr % 25
... (5 Replies)
Hi All,
Please help to write the script that should raise an alarm if the new logs will not come in the log file.
In other words i want to write a script which will monitor the log file continuously and will raise an alarm if the logs will not come after some time suppose 5... (5 Replies)
Please Help me
Question: - we manually moving/removing old files, when we are getting alarm as /dir1/dir2 size greater than 90%.
we manually moving/removing old files and reduce the file size to less than 90%
- I want to delete all 2months before old files once we get the thresh hold >= 90%... (3 Replies)
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
.
.
.
.
Network 10 is... (8 Replies)
I would like to add the ability to change the message that is displayed when timer is finished. At present it just asks for the time I want for the alarm.
I think what I need is another command line argument.
soundfile="/usr/share/sounds/My_Sounds/Alarm-sound-buzzer.mp3"... (5 Replies)
I would like this to work with seconds as well.
#!/bin/bash
#
if ; then
echo "Incorrect usage ! Example:"
echo './CountDown.sh -d "Jun 10 2011 16:06"'
echo 'or'
echo './CountDown.sh -m 90'
exit 1
fi
now=`date +%s`
if ; then
until=`date -d... (7 Replies)