Logging From Background

shadypalm88 · 01-10-2005, 09:35 PM

Hello everyone. I've been writing a server using Linux that has the capability to log information to a file. When I run the server in the foreground, this works properly. But when run in the background (through command & or a call to daemon()), nothing is logged. Logging to standard output works properly.

The app is written in C++ but is using C I/O (fprintf).

Is there something I'm missing regarding logging from a background process?

shadypalm88 · 01-24-2005, 10:56 PM

Reviving my own old thread...

Anyone have any ideas at all?

webvandals · 02-12-2005, 05:43 AM

I'm having the exact same problem.

Does *nobody* know the answer to this?

No logging, no email. Works perfectly unless I background it.

freegianghu · 02-12-2005, 09:37 AM

Quote:

Originally posted by webvandals
I'm having the exact same problem.

Does *nobody* know the answer to this?

No logging, no email. Works perfectly unless I background it.

It's caused daemon function had closed stdio, stdout and stderr

. Try call daemon with second arg other than zero

Code:

daemon(0, 1)

Hope this help,
Giang Hu

webvandals · 02-12-2005, 05:30 PM

Thanks freegianghu. Is there any way to "daemonize" a simple script? In my case, it's actually a PHP script but running from the command line just like a Perl script.

Also, someone may find it helpful to note that I'm only experiencing this issue on my Debian box, my RH9 and CentOS 3.4 boxes run the script in the background just fine.

freegianghu · 02-13-2005, 10:34 AM

Quote:

Originally posted by webvandals
Thanks freegianghu. Is there any way to "daemonize" a simple script? In my case, it's actually a PHP script but running from the command line just like a Perl script.

Also, someone may find it helpful to note that I'm only experiencing this issue on my Debian box, my RH9 and CentOS 3.4 boxes run the script in the background just fine.

Why dont you try with:

Code:

script > script.log 2>&1 &

chrisoman · 01-20-2015, 02:14 PM

Quote:

Originally Posted by webvandals

Thanks freegianghu. Is there any way to "daemonize" a simple script? In my case, it's actually a PHP script but running from the command line just like a Perl script.

Also, someone may find it helpful to note that I'm only experiencing this issue on my Debian box, my RH9 and CentOS 3.4 boxes run the script in the background just fine.

I have been searching around about back ground processing, but my application is embedded systems. I came across libslack (http://libslack.org/) which I haven't used but apparently this is a set of macros that you can use to create deamons() from simple c++/c programs.

Maybe that'll help