Hello

I need to run a program (or a script) from within my program, but the second one must stop the caller program from running.

You must imagine, at a specific event a script has to be run from my program, which then continues listening for other events. I dont need to wait for return values or so, I just want to issue a command and then forget about it.

How do I do that? execve will stop my caller program (or at least i understood the manpage so)

Thanks

raven

Use system(3) and/or fork(2).

A few more details would be helpful but you can do it wiht a simple bash script:

!#bin/bash
cd <path to directory where first executable located>
<name of first exec>
cd <path to script>
./<name of script> &
cd <path to directory where execve located>
execve

Create a text file in your home directory or anywhere you want and give it a nice name like "doexec". Cut and paste the above text to doexec. make sure there is no white space before"!#bin/bash", i.e. these are the first characters in the text file w/o white space in front.
Then open a console su to root and navigate to the location of doexec and run:

# chmod a+x doexec

That makes the script executable. To run doexec, navigate to the directory where it's located and run:

$ ./doexec

Alternatively, you could edit the called script to run the exe program first and shut down at the appropriate time rather than create a new script.

Based on your description, consider system(). While fork() will work, your "calling code" continues to run, which you do not seem to want.

With system() your calling thread is suspened until the child completes.

If you want the calling thread to "become" the child process, execve() and its cousins -- execl, execlp, execle, execv, execvp. These do not return except on error.

system() is probasbly the easiest one code and deal with

I think using signals may help u.Can u make a bit more clear ur quest ??.

pa1 is right - system (under Linux) does not respond to signals -
ie., if the program you call happens to lock up you can't get rid of it.

If you read the man page for system I think it gives a workaround for this.