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				set -e

				T=$(mktemp -d ${TMPDIR:-/tmp}/sh-test.XXXXXX)
				trap 'rm -rf "$T"' 0
				jillesUnsubmitted Done Inline Actions Existing tests use `mktemp -d`, placing the fifo into a temporary directory, to avoid the discouraged `-u` option. jilles: Existing tests use `mktemp -d`, placing the fifo into a temporary directory, to avoid the…
				cd $T
				mkfifo fifo1
				# Open fifo1 for writing and then read block on a dummy fifo
				jillesUnsubmitted Not Done Inline Actions Hmm, how portable is this? It is probably faster than forking off a child process to open the fifo for writing, which the standard requires and other tests do. jilles: Hmm, how portable is this? It is probably faster than forking off a child process to open the…
				{ mkfifo fifo2; read dummy <fifo2; } >fifo1 &
				# Wait for the child to open fifo1 for writing
				exec 3<fifo1
				v=original_value
				jillesUnsubmitted Done Inline Actions Some other tests do stuff like `[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = TERM ]` to avoid depending on signal numbers. jilles: Some other tests do stuff like `[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = TERM ]` to avoid…
				r=0
				read -t 0 v <&3 \|\| r=$?
				kill -TERM "$!" \|\| :
				{ [ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]; } \|\| exit
				[ -z "$v" ]