Re: writting a Daemon in c

1999-10-20 Thread Eric Gillespie, Jr. 
On Wed, Oct 20, 1999 at 10:35:51AM -0400,
Evan Moore <[EMAIL PROTECTED]> wrote:
> I am writting a Daemon in c, I need to know how to disconnect the program
> from the terminal so that if that terminal is destoyed it will not cause
> my server to shutdown. I have done this with perl scripts, but can't not
> figure it out with c. Thanks in advance

man 3 daemon

-- 
Eric Gillespie, Jr. <*> [EMAIL PROTECTED]

"Man is a rope, tied between beast and overman--a rope over an abyss.
 A dangerous across, a dangerous on-the-way, a dangerous looking-back,
 a dangerous shuddering and stopping."
 --Friedrich Nietzsche


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Re: writting a Daemon in c

1999-10-20 Thread Oleg Krivosheev 
On Wed, 20 Oct 1999, Evan Moore wrote:

> 
> I am writting a Daemon in c, I need to know how to disconnect the program
> from the terminal so that if that terminal is destoyed it will not cause
> my server to shutdown. I have done this with perl scripts, but can't not
> figure it out with c. Thanks in advance
> 
> Evan.
> 

man daemon

DAEMON(3)   Linux Programmer's Manual   DAEMON(3)

NAME
   daemon - run in the background

SYNOPSIS
   #include 

   int daemon (int nochdir, int noclose);

DESCRIPTION
   The  daemon()  function  is for programs wishing to detach
   themselves from the controlling terminal and  run  in  the
   background as system daemons.




that's from potato

OK

RE: writting a Daemon in c

1999-10-20 Thread Lewis, James M. 

> I am writting a Daemon in c, I need to know how to disconnect the program
> from the terminal so that if that terminal is destoyed it will not cause
> my server to shutdown. I have done this with perl scripts, but can't not
> figure it out with c. Thanks in advance
> 
> Evan.
> 
There is a very good reference to this in "Unix Network
Programming Vol 1" by W. Richard Stevens.  Basically:
   fork - parent exit
   setsid - become session leader
   signal - turn off SIGHUP
   fork - parent exit (so this process is not a session leader)
   umask - reset umask if you need to
   close - flush and close all file descriptors

Then you open any files you need to, etc...  There may
be a few more things you might want to reset (like a
bunch of signal handlers, etc.).

jim

Re: writting a Daemon in c

1999-10-20 Thread Hwei Sheng TEOH 

On Wed, 20 Oct 1999, Evan Moore wrote:

> I am writting a Daemon in c, I need to know how to disconnect the program
> from the terminal so that if that terminal is destoyed it will not cause
> my server to shutdown. I have done this with perl scripts, but can't not
> figure it out with c. Thanks in advance

Use fork() to fork your daemon process. Exit the main process and have the
child process perform the daemon functions. The child process will not exit
when the controlling tty is gone.


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