Hi to all,

To Mara and sudhir_pandey...Many thx for the examples. They are helping me understand sigaction better.

However, i'm still facing some problems:

1) How can make a call to run Program2.c from inside Program1.c?

2) Program1 and Program2 are two separate C programs - Program1 is in kernel whereas Program is a user space program that I've written. How can I send a signal from program1 to Program2? Do I get the pid of Program2 when it is run and then issue a kill with the pid as argument? How do I get the pid of Program2 using C code? Is there a function where you provide the name of the .c file and it will return the pid?

Any input will be greatly appreciated as always...

Warm regards to you all,
Visham

The two things are related. Everything depends on the thing what's program1 in fact. If it's a driver, you can add a new iocntl that will run the code. When writing code which supports iocntl (from the kernel side) you can get pid of the process that called it, so you can note it down somewhere.

hi vishamr2000

A process can know it's pid by executing cat /proc/self . Execute this command through your programme and you know the pid . also do man proc for more details .

bye