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Jim Meyering
2003-08-16 17:39:51 +00:00
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2003-08-15 Jim Meyering <jim@meyering.net>
2003-08-16 Jim Meyering <jim@meyering.net>
* Version 5.0.91.
* src/tail.c (tail_lines): Fix a potential (but very hard to exercise)
race condition bug. The bug would be triggered when tailing a file
with file pointer not at beginning of file, and where the file was
truncated to have a length of less than the initial offset at just
the right moment (between the two lseek calls in this function).
An invalid initial value for *read_pos would result in
`tail -n0 -f FILE' and `tail -c0 -f FILE' doing what amounted to a
busy-wait rather than sleeping between iterations. The bug manifests
itself only when tailing regular files that are initially nonempty.
* src/tail.c (tail_bytes): Set *read_pos to new file offset after
each xlseek call.
(tail_lines): Likewise, after lseek calls.
Reported by Nick Estes. See http://bugs.debian.org/205251 for details.
* tests/tail-2/tail-n0f: New file. Test for above fix.
2003-08-15 Jim Meyering <jim@meyering.net>
* Makefile.maint (sc_space_tab): Use exclusion list in separate file.
(sc_sun_os_names): Likewise.
* .x-sc_space_tab, .x-sc_sun_os_names: New files.