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Re: "wait" loses signals


From: Chet Ramey
Subject: Re: "wait" loses signals
Date: Mon, 24 Feb 2020 11:23:35 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 2/24/20 7:58 AM, Daniel Colascione wrote:

> No, it's not that much trouble to fix the bug. The techniques for fixing
> this kind of signal race are well-known. In particular, instead of
> waitpid, you use a self-pipe and signal the pipe in the signal handler,
> and you have a signal handler for SIGCHLD. 

You've just substituted a real IPC mechanism (pipes) for the one people
are trying to make signals into.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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