How to prevent exiting from running program

Hi all...

I am developing a C programme for database management, and I need to make it unclosable unless the quit button is clicked. So I shall be realy thankful if anybody could help me out and tell me how to do it.
I want to isable everything right from Ctrl+z to suspend to Ctrl+c for exit and Ctrl+Alt+Delete if possibal at all.

Thanks in advance....

>> and I need to make it unclosable unless the quit button is clicked
for GUI, don't know

following for console ;)

Code:

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#include <signal.h>

signal(SIGINT,SIG_IGN); /* disable ctrl-C */
signal(SIGQUIT,SIG_IGN); /* disable ctrl-\ */
signal(SIGTSTP,SIG_IGN); /* disable ctrl-Z */

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Quote:

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Originally posted by scorpio_IITR
I want to isable everything right from Ctrl+z to suspend to Ctrl+c for exit and Ctrl+Alt+Delete if possibal at all.

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all you can do is catch a bunch of 'allowed' signals:

stopping (sort of ;) ):
SIGINT (Ctrl-C)
SIGABRT(Ctrl-\)
SIGTERM
SIGHUP

pausing:
SIGSTP (Ctrl-Z)

you can't catch SIGKILL (kill -9) or SIGSTOP, as they're handled by the kernel; Ctrl+Alt+Del is a different story: in console mode, init snatches it, in X usually the desktop manager does. either way, you probably won't see it (and well you shouldn't - you can't handle the reset button either :D )

>> SIGABRT(Ctrl-\)
?*?*? SIGQUIT

>> SIGSTP (Ctrl-Z)
SIGTSTP

Quote:

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Originally posted by Jaguar
>> SIGABRT(Ctrl-\)
?*?*? SIGQUIT

>> SIGSTP (Ctrl-Z)
SIGTSTP

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yeah, SIGTSTP (sorry for the typo).

however, Ctrl-\ may send either the Posix "Quit" (SIGQUIT) or the Ansi "Abort" (SIGABRT) - it's terminal-dependent.

thanks for help buddies....