CVS commit: src/bin/sh

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Fri Feb  7 02:06:13 UTC 2020

Modified Files:
        src/bin/sh: jobs.c

Log Message:
Avoid a core dump if a child process that is not one of our
children happens to exit while we are waiting for another child
to exit.

This can happen with code like

        sh -c '
                sleep 5 &
                exec sh -c "sleep 10 & wait !$"
              '

when the inner "sh" is waiting for the 10 second sleep to be
done, the 5 second sleep started earlier terminates.   It is
a child of our process, as the inner shell is the same process
as the outer one, but not a known child (the inner shell has no
idea what the outer one did before it started).

This was observed in the wild by Martijn Dekker (where the outer
shell was bash but that's irrelevant).

XXX pullup -9


To generate a diff of this commit:
cvs rdiff -u -r1.106 -r1.107 src/bin/sh/jobs.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.