From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 2 Apr 2019 17:41:17 +0000 (-0400)
Subject: Fix: logging: log_add_time() save/restore errno
X-Git-Tag: v2.12.0-rc1~602
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;ds=sidebyside;h=b1093e5fa7d006fb463b2754119c6d2796bb7d82;hp=b1093e5fa7d006fb463b2754119c6d2796bb7d82;p=lttng-tools.git

Fix: logging: log_add_time() save/restore errno

The debugging logging macros (e.g. DBG()) are used as printf in the
lttng-tools source files. The printf() implementation does not alter the
errno value, so the fact that log_add_time() (through clock_gettime())
can alter errno is unexpected. For instance, adding a logging statement
for debugging purposes within a function for which errno is expected to
stay unchanged on return will change the behavior between execution with
-vvv and non-verbose.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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