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#!/bin/sh
# Check that a write failure with errno == EPIPE
# doesn't cause grep to issue multiple "write error" diagnostics.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
if
# Use awk to output a bounded amount of data to the grep in question,
# so that the test doesn't loop forever if grep is buggy.
# Use an explicit /dev/null for the benefit of older (pre-POSIX) awks.
#
# Carefully close fd 3 when not needed, as a sanity check.
#
# Do not use "trap - PIPE" or "trap 'something' PIPE" here, since we may
# be running in an environment where SIGPIPE is ignored, and in such an
# environment POSIX says that "trap '' PIPE" is all we can do portably.
(
${AWK-awk} 'BEGIN { for (i=0; i<1000000; i++) print i; }' /dev/null 3>&- |
(trap '' PIPE; exec grep . 2>&3 3>&-) |
:
) 3>&1 | (
read line1 && echo >&2 "$line1" &&
read line2 && echo >&2 "$line2"
)
then fail=1
else fail=0
fi
Exit $fail
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