Hi,

Am new to Linux internals.
I want to use shared memory segment between the parent and the child processess.
if i create a shared memory before fork,the child inherits the attached
shared memory segments but once i call exec in the child process, all attached shared memory segments are detached. How to maintain a shared memory segment between parent and child even if i call exec in the child processess.

Thanks in advance..

The exec() family of system calls is a group of six calls that are used to overlay the process image of a process with the code and data of a new process copied from a file. http://www.scit.wlv.ac.uk/~jphb/spos...alls/exec.html

in other words, everything that used to be in the memory of the caller process such as variables... will be thrown away. u should re attach the shared memory from the called program.
HINT: send the shared memory ID or key to the new called process as arguments from the exec function