How to - Daemon process in C language

Linux Daemon Writing HOWTO
:)

claudiatita wrote:

How do i do to create a “daemon” process?

It depends on what platform, and what you expect it to do. On most modern operating systems user created daemons have to follow some fairly complex rules in order not to disrupt the system. Perhaps you could clarify what it is you hope to achieve.

Well, i'm studying unix process structure, i.e, how to create and manage processes in Unix, using C.

I know how to use function fork() to create a child, however, to change the "parent" to a deamon process it is not clear to me how to put that in C code.

I need to daemonize a process that will create 3 other processes, each one will be responsible for executing different actions (that comunicate to their parent using unnamed pipes).

Something like this:

(...)
for (i = 0; i < 3; i++) {

       pid_t id = fork();

       if (id == 0) {

           switch (i) {
           case 0: //child 1 do some stuff
           case 1: //child 2 do something else
           case 2: //child 3 ... whatever...
           }
else {
      //parent stuff ...
        }
}//close for

But this code is only for a "normal" process...

Question one: first of all, i create the childs first and after that will change a parent process to a deamon one?

Question two: how?

Tks in advance,
Claudia