topic Modify script in Operating System - Linux

Modify script

Intothenewworld — Mon, 21 May 2012 08:51:43 GMT

in my linux system , we have a program ( it is a binary program , I do not have the source code ) which will do something in the database . In the program , there is a exit function , when select exit , it will quit the program and go to linux shell , this program works fine.

Now , I would like to do modify for this program -- I would like to send out a mail to me once quitted this program , but how to know (detect) the program is quitted ?

thx

** may be my question is not clear enough , I will reply it if anything is not clear.

Re: Modify script

Dennis Handly — Mon, 21 May 2012 09:07:37 GMT

(This is a HP-UX board, not Linux.)

>I would like to do modify for this program

You can't, you don't have the source. You could modify the script.

>I would like to send out a mail to me once quitted this program but how to know (detect) the program is quitted?

All you can know is the exit status, $? for a real shell.

Re: Modify script

H.Becker — Mon, 21 May 2012 20:06:19 GMT

You can try to pre-load a shared library which registers an atexit routine, just like:

$ cat hello.c

#include <stdio.h>

#include <stdlib.h>

int main (void) {

printf ("%s, hello\n", __func__);

exit (EXIT_SUCCESS);

}

$ make hello

cc hello.c -o hello

$ ./hello

main, hello

$ cat addatexit.c

#include <stdio.h>

void myexit(void) {

printf ("%s, here we are\n",__func__);

}

static void __attribute__((constructor)) init() {

atexit(myexit);

}

$ cc -o addatexit -shared addatexit.c

$ LD_PRELOAD=./addatexit ./hello

main, hello

myexit, here we are