Not sure why waitpid() isn't working
Hello,
I'm trying to create a child process and waitpid() on a parent process that's running in background. But when I check the process list, child process is 'defunct':
Code:[...] int *stat = NULL; proc_id = fork(); if(proc_id == 0) execl(path_to_proc, name_of_proc, NULL) else if(proc_id>0) waitpid(proc_id, stat, WNOHANG) [...]
Any thoughts?
Why are you using WNOHANG ?
This returns immediately, whether the child has exited or not.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Hi Salem,
I'm using WNOHANG because I want the parent process to go on with the rest of the code without waiting the child process to finish it job
My idea was to ensure that parent is waiting when the child finish (with waitpid), but without being blocked on that part of the code
not sure if thats the right way to accomplish this
Why bother with the waitpid at all, if you're just going to carry on.
All you're achieving is a very small delay in calling waitpid with nohang.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
