Re: Fixing coproc race condition bug

[Jim Avera]

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.

-Jim