C system call in linux

nerak · 04-08-2002, 03:29 PM

Hi all :>

I have a C program that runs fine by itself, but when I put it to run automatically when the computer boots up, Linux doesn't recognize the system("blahblahblah") call...can anybody help?

I put the program in the /etc/init.d folder and created a symbolic link in the /etc/rc.d/rc#.d as well.

Thanks in advance.

acid_kewpie · 04-08-2002, 03:36 PM

well what is the line?? remember you'll not have the path set up and all that. any calls should be absolute

nerak · 04-08-2002, 03:40 PM

well, the rundown of my program is this:

- i have a shell program in the init.d folder that calls a C program (works) in the background
- the C program listens on a port and calls system("netscape") when some signal comes from the port (help help)

does this clarify things a bit?

acid_kewpie · 04-08-2002, 03:43 PM

well... it's not absolute is it???

nerak · 04-08-2002, 04:04 PM

ohh >_<

i just tried changing the system command to system("/usr/bin/shutdown -r +5") to give it an absolute path...but my program is still not shutting down when the signal is activated!!

help help...

crabboy · 04-08-2002, 09:33 PM

Is your program using signals or does it use sockets (listen on a port)? Your terminology is a bit confusing.

If you are using signals you are using the signal call:

Code:

signal( SIGUSR1, sig_usr1 );

If you are using sockets to communicate (unnecessary complication for simple IPC on the same machine) you will have:

Code:

socket( AF_INET, ... );
bind( ... );

Or are you using both?

Also, I'd recommend using exec instead of system.

nerak · 04-10-2002, 03:04 PM

hey i used the "execl" command and my prog works now :> just wanted to say thank you~