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6e824a6619
If we can't output more data, we should immediately diagnose the issue and exit rather than consuming all of input (in some cases). * src/tail.c (xwrite_stdout): Also diagnose the case where only some data is written. Also clearerr() to avoid the redundant less specific error from atexit (close_stdout); * src/head.c (xwrite_stdout): Copy this new function from tail, and use it to write all output. * tests/misc/head-write-error.sh: A new test to ensure we exit immediately on write error. * tests/local.mk: Reference the new test.
53 lines
1.7 KiB
Bash
Executable File
53 lines
1.7 KiB
Bash
Executable File
#!/bin/sh
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# Ensure we diagnose and not continue writing to
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# the output if we get a write error.
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# Copyright (C) 2014 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ head
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if ! test -w /dev/full || ! test -c /dev/full; then
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skip_ '/dev/full is required'
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fi
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# We can't use /dev/zero as that's bypassed in the --lines case
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# due to lseek() indicating it has a size of zero.
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yes | head -c10M > bigseek || framework_failure_
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# This is the single output diagnostic expected,
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# (without the possibly varying :strerror(ENOSPC) suffix).
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printf '%s\n' "head: error writing 'standard output'" > exp
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# Memory is bounded in these cases
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for item in lines bytes; do
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for N in 0 1; do
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# pipe case
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yes | timeout 10s head --$item=-$N > /dev/full 2> errt && fail=1
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test $? = 124 && fail=1
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sed 's/\(head:.*\):.*/\1/' errt > err
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compare exp err || fail=1
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# seekable case
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timeout 10s head --$item=-$N bigseek > /dev/full 2> errt && fail=1
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test $? = 124 && fail=1
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sed 's/\(head:.*\):.*/\1/' errt > err
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compare exp err || fail=1
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done
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done
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Exit $fail
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