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73d119f4f8
* src/tail.c (file_lines): Ensure we use a buffer size >= PAGE_SIZE when searching backwards to avoid seeking within a file, which on sysfs files is accepted but also returns no data. * tests/tail/tail-sysfs.sh: Add a new test. * tests/local.mk: Reference the new test. * NEWS: Mention the bug fix. Fixes https://bugs.gnu.org/67490
35 lines
1.1 KiB
Bash
Executable File
35 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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# sysfs files have weird properties that can be influenced by page size
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# Copyright 2023 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 <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ tail
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file='/sys/kernel/profiling'
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test -r "$file" || skip_ "No $file file"
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cp -f "$file" exp || framework_failure_
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tail -n1 "$file" > out || fail=1
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compare exp out || fail=1
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tail -c2 "$file" > out || fail=1
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compare exp out || fail=1
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Exit $fail
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