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tail: avoid infloop with -c on /dev/zero

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Problem reported by Ionut Nicula in:
https://bugs.gnu.org/70477
* src/tail.c (tail_bytes): Do not loop forever on commands
like 'tail -c 4096 /dev/zero'.
* tests/tail/tail-c.sh: Test this fix.
This commit is contained in:
Paul Eggert
2024-04-19 21:44:32 -07:00
parent 9ab1f9db94
commit fb543b6b82
3 changed files with 32 additions and 5 deletions
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10
tests/tail/tail-c.sh
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@@ -35,4 +35,14 @@ printf '123456' | tail -c3 > out || fail=1
printf '456' > exp || framework_failure_
compare exp out || fail=1
# Any part of /dev/zero should be valid for tail -c.
head -c 4096 /dev/zero >exp || fail=1
tail -c 4096 /dev/zero >out || fail=1
compare exp out || fail=1
# Any part of /dev/urandom, if it exists, should be valid for tail -c.
if test -r /dev/urandom; then
timeout --verbose 1 tail -c 4096 /dev/urandom >/dev/null || fail=1
fi
Exit $fail