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dbg: save errno from modification in NL_DBG()

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Evaluating the logging statement might overwrite the errno. Save and
restore it so that NL_DBG() preserves the errno.

Signed-off-by: Thomas Haller <thaller@redhat.com>
This commit is contained in:
Thomas Haller 2015-03-05 10:28:41 +01:00
parent d8f080d94f
commit 364ab3daf6
1 changed files with 4 additions and 1 deletions
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5
include/netlink-private/netlink.h
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@ -86,11 +86,14 @@ struct trans_list {
#ifdef NL_DEBUG
#define NL_DBG(LVL,FMT,ARG...) \
do { \
if (LVL <= nl_debug) \
if (LVL <= nl_debug) { \
int _errsv = errno; \
fprintf(stderr, \
"DBG<" #LVL ">%20s:%-4u %s: " FMT, \
__FILE__, __LINE__, \
__PRETTY_FUNCTION__, ##ARG); \
errno = _errsv; \
} \
} while (0)
#else /* NL_DEBUG */
#define NL_DBG(LVL,FMT,ARG...) do { } while(0)