From: ara.t.howard@...
Date: 2006-07-12T02:20:36+09:00
Subject: Re: Nuby Q: Daemonize (other materials have been read!)

On Wed, 12 Jul 2006, Rogue Amateur wrote:

> unknown wrote:
>> On Wed, 12 Jul 2006, Rogue Amateur wrote:
>>
>>> [snip again]
>>>
>>> I tried it:
>>> ./daemon.rb ./my_Script.rb
>>> it dies without comment.
>>>
>>> running ./my_Script.rb, however, works as expected.  Notions?
>>
>> it doesn't die - it starts the script as a daemon.  check in top.
>>
>
>
>
> Ok, then I'm really confused.  Because the script is NOT running.
>
> The script in question sends data to and receives data from a socket.  I
> have test code written which sends data to the appropriate socket, and
> receives back, and prints the result.
>
> When I started the listener, then daemonized the script, the listener
> sat there doing nothing.  ps -ef returned nothing (for the script name).
> When I started the script alone, suddenly the listener has something to
> do, and the ps -ef returns data.  I am sure I did something wrong, I
> don't doubt it a bit, but... it really doesn't look like the script is
> running as a daemon.  Am I using the wrong checks?  Will my sockets
> suddenly work differently when run as a daemon?  I haven't found
> anything that says that's likely so... I must be confused.
>
> Thank you for your quick responses.

hmmm.  not sure what to say.  here it is spelled out a bit more:

   fortytwo :~ > cat `which daemon`
   #! /usr/bin/env ruby

   fork{
     fork{
       null = open '/dev/null', 'r+'
       [STDIN, STDOUT, STDERR].each{|io| io.reopen null}
       cmd = ARGV.join(' ')
       status = system cmd
       status ? exit : abort
     }
     exit!
   }

   fortytwo :~ > daemon sleep 42

   fortytwo :~ > ps -elf |grep sleep
   1 S ahoward  18615     1  0  79   0 -   715 wait   11:19 pts/50   00:00:00 ruby /home/ahoward/bin/daemon sleep 42
   0 S ahoward  18616 18615  0  79   0 -   969 -      11:19 pts/50   00:00:00 sleep 42
   0 R ahoward  18618 18118  0  77   0 -    96 -      11:19 pts/50   00:00:00 grep sleep


regards.

-a
-- 
suffering increases your inner strength.  also, the wishing for suffering
makes the suffering disappear.
- h.h. the 14th dali lama