>Ok. In that event, please provide a simple test
case.
Christopher, Corinna:
Thanks for you help on this!
Here's a short program to recreate this problem:
("main.c")
=====================================================
int main(int argc, char *argv[]) {
int pid, sid, rc;
if ((pid = fork()) == 0) {
// child thread
pid = getppid();
while(1) {
rc = sleep(10);
printf("child is alive...\n");
if ((sid = getpgid(pid)) == -1) {
printf("exiting child process...rc=2\n");
exit(2);
}
}
}
else {
// parent thread
while(1) {
rc = sleep(10);
printf("parent is alive...\n");
// check if our child process has been killed
if ((sid = getpgid(pid)) == -1)
exit(3);
printf("getpgid of child pid:%d returned
pid:%d\n", pid, sid);
}
}
}
==========================================
and here are the steps I used to find the problem:
1) bring up Cygwin shell 1
2) gcc main.c <create executable>
3) a.exe <run executable>
4) let program run 10-15 seconds to see output from
parent and child
5) bring up Cygwin shell 2
6) ps <to see PIDs of parent and child>
7) kill -9 <child PID>
8) observe that parent continues to run, and sees
the parent's PID reported as the result of the
getpgid
BTW, the same problem occurs if the parent PID is
killed - the child continues to see that the parent
PID is alive.
The general problem I'm trying to solve here is:
Given a long-lived parent process and a long-lived
child process, I want the parent and child to be able
to detect if the child or parent has died, and if so,
exit.
Thanks again for your kind assistance.
Gavin Bowlby
<[EMAIL PROTECTED]>
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