I am writing an extensible shell am I am working on an issue related to catching SIGCHLD signals from a Unix kernel.
I am trying to maintain a list of current jobs (so when the user types "jobs" into the shell I can return the appropriate jobs). The issue arises when I need to remove jobs from the list. I'd like to remove them from the list when I receive a SIGCHLD signal letting me know the process is terminated.
There are two issues: 1. When I receive a SIGCHLD signal, how do I know which child sent that signal? 2. How do I deal if multiple SIGCHLD signals are received and they do not get queued so I'll only see the first SIGCHLD return?
Thank you!