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Re: Fixing coproc race condition bug

From: Jim Avera
Subject: Re: Fixing coproc race condition bug
Date: Sun, 24 Oct 2021 13:54:20 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 10/24/21 1:44 PM, Jim Avera wrote:
# Note: Ignore errors when closing pipes, as the user might have manually closed # the fds using 'exec {varname}>&-' or similar.

Actually this isn't a good idea because the fd might have been re-used for something else; so an error should be reported to make that bug-condition noticeable so it can be fixed.

Instead, bash should search all active CPROC variables for any file descriptors being closed explicitly, and undef the corresponding COPROC slot; that will prevent bash from calling close() on a previously-closed file descriptor.


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