Pending signal in EXIT trap causes pattern matching to fail

[Andreas Schwab]

gmatch in lib/glob/sm_loop.c returns FNM_NOMATCH when a signal is
pending.  This can cause spurious pattern matching failures if a SIGPIPE
is received while executing the EXIT trap:

$ cat trap.sh
trap 'set -x; echo trap; case a in *) echo match >&2;; esac; echo done >&2' EXIT
while :; do :; done
$ bash trap.sh | :
^C++ echo trap
trap.sh: line 1: echo: write error: Broken pipe
++ case a in
++ echo done
done

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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