When the error condition occurs I expect you will have three processes: a parent perl process, a child perl process and an arsload process. Are all three stopped?

SIGSTOP can't be caught or ignored but SIGTSTP, SIGTTIN and SIGTTOU can. All four signals stop a process by default. The latter two are usually generated only for processes running in the background. Are you running your program in the background?

You could initiate a separate process group in your child process: see Complete Dissociation of Child from Parent. If you do this then any signals sent from the arsload process to all processes in the process group should not affect the parent process.

Your parent process should receive a SIGCHLD when its child is stopped. If it is not stopped itself then it can send a SIGCONT.

In reply to Re^3: Stopped child hangs parent by ig
in thread Stopped child hangs parent by jafoba

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