[ELDK] kill an entire process group

[Wolfgang Denk]

In message <48971BCF.8705.1721342 at g.modugno.elettronika.it> you wrote:
> 
> I wrote a small C program killpg that uses kill() function to send 
> the same signal to all the child processes, by passing -pid (a 
> negative number) to the function.

That means you send the signal to all processes in the process group.
This implies that there is a process group in the first place.

> When I use the NFS development system, my killpg program works well 
> and I can kill the parent and all the child processes.

In the NFS envrionment you use standard SYSV init, standard login and
standard bash.

> When I copy killpg executable to my target system (based on SELF 
> ramdisk), kill() function returns with an error, ESRCH (pid argument 
> doesn't correspond to a real pid).

In the SELF envrionment you use BusyBox init, login, and shell.

> libc libraries are the same in my target and nfs development systems. 
> What could cause the different behaviour?

The shell. The Busybox shell obviously does not create a process group
at all.

> Can someone suggest me a better method to kill parent and all the 
> child processes?

If you don't want to create  the  process  group  and  the  processes
yoruself, then you probably might ant to use a real shell (bash).

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
When dreams become more important than reality, you give  up  travel,
building,  creating;  you even forget how to repair the machines left
behind by your ancestors. You just  sit  living  and  reliving  other
lives left behind in the thought records.
	-- Vina, "The Menagerie" ("The Cage"), stardate unknown