Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!uunet!mcsun!unido!rwthinf!marvin.e17.physik.tu-muenchen.de!berg
From: berg@marvin.e17.physik.tu-muenchen.de (Stephen R. van den Berg)
Newsgroups: comp.unix.programmer
Subject: Re: possible race condition?
Message-ID: <4314@rwthinf.UUCP>
Date: 10 May 91 13:57:05 GMT
References: <1991May9.144935.20078@ge-dab.GE.COM>
Sender: news@rwthinf.UUCP
Lines: 25

Richard Coleman writes:
>  if (fork() != 0)
>     exit(0);              /* parent process exits */
>  setpgrp();               /* change process group and lose control tty */
>  signal(SIGHUP,SIG_IGN);
>  if (fork() != 0)
>    exit(0);               /* first child process exits */
>  /* second child process continues as daemon */

Why not do it this way, and save a LOT of trouble:

  signal(SIGHUP,SIG_IGN);
  if (fork() != 0)
     exit(0);              /* parent process exits */
  setpgrp();               /* change process group and lose control tty */
  if (fork() != 0)
    exit(0);               /* first child process exits */
  /* second child process continues as daemon */

Just my $0.02
--
Sincerely,                 berg@marvin.e17.physik.tu-muenchen.de
           Stephen R. van den Berg.
"I code it in 5 min, optimize it in 90 min, because it's so well optimized:
it runs in only 5 min.  Actually, most of the time I optimize programs."