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Old 07-11-2004, 11:54 PM   #1
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catching signals

Hi...there do u know how is it possible to handle some signals in my programs in Linux?

I have a ncurse based application and i want when a user press the ctrl+c the application shows an appropriate message....
Do u have som links for starting reading?
Old 07-12-2004, 01:13 AM   #2
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Use the 'signal' system call.

signal(sighandler, signalname);

sighandler is the function that should be invoked when ur process recieves the function signal name. but remember to write sighandler without () i.e., don't write it as,

signal(sighandler(), signalname);

cos signal expects a function pointer. except SIGKILL, all the signals can be caught. read "unix network programming" by richard stevens for details.
Old 07-12-2004, 08:57 AM   #3
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Here's an example:
#include <stdio.h>
#include <signal.h>

void sigint_handler(int num)
  puts("You pressed CTRL-c!");

int main(void)
  signal(SIGINT, sigint_handler);


  return 0;
Just run the program and hit ENTER to exit it. Before you hit enter try hitting CTRL-c a few times.
Old 11-16-2007, 05:05 AM   #4
Registered: Nov 2007
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It would be better to use sigaction.
struct sigaction sig1;
sig1.sa_handler = mysigaction // mysigaction is a function
sigaction(SIGALRM,&sig1,NULL); //execute mysigaction() when SIGALRM


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