background code

linuxanswer · 04-06-2004, 02:41 PM

anyone know how implemente in c, the backgorund execution like in bash with the & operator at last ? For example i code a program that once it's started, return me the shell, and when it finish, warn me about the end execution. tnx in advance

Komakino · 04-06-2004, 02:55 PM

Why not just run your program IN the background from bash (using the & symbol as usual) and write it so that just before it finishes it either prints something to the shell to alert you, or prints the bell symbol (\a?) so the PC Speaker beeps?

linuxanswer · 04-06-2004, 03:06 PM

too simple, komakino, too simple : )

jinksys · 04-06-2004, 04:03 PM

Maybe you could create a program with two threads, one that spawns a shell, and another with your program code. Then when your program thread is done, it gives you a warning, then after a time interval, kills the shell thread? The only real advantage of this would be having the option of implementing a program switch so you can tell the program to run interactively, or not. Komakino's answer is the simplest and fastest to implement though.

linuxanswer · 04-06-2004, 04:11 PM

komakino, one question, what's (\a?) ? How can i implement this ?

jinksys · 04-06-2004, 09:45 PM

\a is a printf escape sequence, it produces a beep. You use it like:

Code:

printf("\a")   ;

Depending on your terminal, \a will produce a beep or visual alert (like a screen flash).