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backtrace: fix off-by-one on string output

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sizeof("foo") includes the trailing null byte, so all the output had
nulls through it. Most terminals quietly ignore it, but it makes some
tools misdetect file types and other annoyances.

Easy fix: subtract 1.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16862
This commit is contained in:
Rob Norris 2024-12-14 05:12:14 +11:00 committed by Brian Behlendorf
parent 7cbe7bbbd4
commit 6604fe9a06
1 changed files with 1 additions and 1 deletions
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2
lib/libspl/backtrace.c
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@ -38,7 +38,7 @@
*/
#define spl_bt_write_n(fd, s, n) \
do { ssize_t r __maybe_unused = write(fd, s, n); } while (0)
#define spl_bt_write(fd, s) spl_bt_write_n(fd, s, sizeof (s))
#define spl_bt_write(fd, s) spl_bt_write_n(fd, s, sizeof (s)-1)
#if defined(HAVE_LIBUNWIND)
#define UNW_LOCAL_ONLY