Re: fork/system/child processes

you probably could do a
if program ends then
send signal stop or term
then system run program

but i forgot if u can do another then


OR

loop while program is runining = true then
do nothing
if = false then run signal term

then just put a program exec to start the program

loop


hope this info is close to correct
im not too far into my student programming career lol

On Tue, 2003-12-02 at 22:23, Don wrote:

This isn't fedora-specific...

I have an application that MUST run forever.... if it crashes, dies,
ends for any reason I want it to start again.

One exception, I want to be able to stop it with a kill term...

So, my solution is a very simple loop...

for (;1==1;) {
    system("command-to-run");
    #do some sort of logging to show command-to-run ended unexpectedly
}

If my loop program gets a sig term, I want to trap that, kill the child
process and then exit gracefully.

I can trap the signal, but how do I get the pid of the child process
(command-to-run)

I tried:
for (;1==1:)
   $newpid = fork;
   if ($newpid) {
	# parent...
	wait;
	#log unexpected end of command-to-run
   } else {
	# child ...
        system(command-to-run);
	exit;
   }
}

but in that case $newpid is the pid of the child that issues "system"...
not the pid of "command-to-run". (expected... but not what I want/need.)

Any suggestions?

Thank you,
Don




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