Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Basic signal and alarm usage
Top Forums Programming Basic signal and alarm usage Post 302119198 by Perderabo on Monday 28th of May 2007 06:21:48 PM
Old 05-28-2007
One way:
Code:
#include <curses.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>

void handler(int sig) { }

int main( void )
{
        int state;
        signal(SIGALRM, handler);
        initscr();
        clear();
        state=0;
        while(1) {
                if(state) {
                        mvprintw(10, 10, "The ALARM is going off now!\n" );
                } else {
                        mvprintw( 10, 10, "Snoozing now..zzzzzz\n");
                }
                refresh();
                alarm(5);
                pause();
                state=!state;
        }
}

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Alarm signal

Hi, when I execute a script on unix AIX, I've got an error message: "Execution: 85328 Signal d'alarme". If I edit this file with "vi", I ve got the same error after a while (about 1 minute). If I try with another user I still have the problem. But if I rename this file, no problem. My... (5 Replies)
Discussion started by: cgsteph
5 Replies

2. 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

3. AIX

basic question about disk usage

how to i find out the disk usage on a server. say in windows examples its like C:/ D:/ and checking out the disk space. how can i find in Unix. can i just use df -k (3 Replies)
Discussion started by: karthikosu
3 Replies

4. Shell Programming and Scripting

Basic bash 'for loop' usage

Hi! I have a simple question about using a for loop. I'm trying to open up all the zip files in the currect directory with ark, but I am getting the error "bash: syntax error near unexpected token `for $i ; do ark $i ; done ; I looked in the info pages for bash, but I can't seem to figure... (2 Replies)
Discussion started by: Orange Stripes
2 Replies

5. Programming

Usage of exit() inside a signal handler

Is it ok to use exit() inside a signal handler? I catch SIGUSR1 in a signal handler and I try to close a file and then exit. The result is inconsistent. Sometimes the process exit and sometimes it returns to the original state before the signal handler was invoked. Perhaps exit is not legal in... (8 Replies)
Discussion started by: Tuvia
8 Replies

6. HP-UX

how can I find cpu usage memory usage swap usage and logical volume usage

how can I find cpu usage memory usage swap usage and I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times my final destination is monitor process logical volume usage above X % and number of Logical voluage above can I not to... (3 Replies)
Discussion started by: alert0919
3 Replies

7. Solaris

False Memory usage alarm!!

Hi Experts, I am using Solaris-10, Sun-Fire-V445. i got often the below message- "Memory Usage – Critical, Memory usage (RAM) exceeding 90% The memory utilization is exceeding 90%" in a application running on solaris. I checked with Vmstat. Everything seems to be fine. Where i should... (5 Replies)
Discussion started by: thepurple
5 Replies

8. 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

9. Shell Programming and Scripting

basic computer usage report

Our small company, about 5 users, need a basic script that scans mapped network drives (example: drive b,c,d, e, and f) for hard drive usage. This needs to send a report to myself in any type of basic notepad format (easy to read and decipher) for drives that have reached 80% usage... any ideas? ... (1 Reply)
Discussion started by: jessessays
1 Replies

10. UNIX for Dummies Questions & Answers

Basic sed usage in shell script

Hi, A basic sed question. I have a set of files. In each file there is a number that I want replaced. For example, if I run sed I should get the following: % cat test2.txt #goofy//171.00 goofy 171.00 % sed -i 's/171/xxx/g' test2.txt % cat test2.txt #goofy//xxx.00 goofy xxx.00 ... (2 Replies)
Discussion started by: pc2001
2 Replies

LEARN ABOUT MOJAVE

alarm

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
All times are GMT -4. The time now is 05:53 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy