Slightly Improved Daemonize Function

We all know Stevens' book and remember what you need to do before daemonizing a process. However, finding the max number of fds to close is not a trivial exercise. Here is my updated version of Stevens' daemonize function:

/*
 * daemonize: daemonizes the process per Steven's book
 * while calculating the max_fds to be closed.
 */
void daemonize() {
 int max_fd;
 pid_t pid;
 int i;

 // Parent terminates, child continues
 if ( (pid = fork()) != 0 ) {
   exit(0);
 }

 // Child #1: become a session leader
 setsid();
 signal(SIGHUP, SIG_IGN);

 // fork, then terminate first child to guarantee no terminal
 if ( (pid = fork()) != 0 ) {
   exit(0);
 }

 // Child #2: change working-dir and clear umask
 chdir("/");
 umask(0);

 // Child #2: close all descriptors
 max_fd = (int) sysconf(_SC_OPEN_MAX);
 for(i=0; i < max_fd; i++) {
   close(i);
 }
}