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save and restore errno in logging function

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this makes it save to use logging functions in statements that
expect errno to be unchanged
This commit is contained in:
Andreas Schultz 2016-03-30 10:14:12 +02:00
parent 84859e20c4
commit a4cb96da7c
1 changed files with 9 additions and 2 deletions
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11
src/common/capwap_logging.c
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@ -107,11 +107,13 @@ void capwap_logging_disable_console(void) {
/* */ /* */
#ifdef ENABLE_LOGGING #ifdef ENABLE_LOGGING
void capwap_logging_printf(int level, const char* format, ...) { void capwap_logging_printf(int level, const char* format, ...)
{
int errsv = errno;
va_list args; va_list args;
char prefix[256]; char prefix[256];
va_start(args, format); va_start(args, format);
#ifdef CAPWAP_MULTITHREADING_ENABLE #ifdef CAPWAP_MULTITHREADING_ENABLE
capwap_lock_enter(&l_loglock); capwap_lock_enter(&l_loglock);
@ -135,10 +137,13 @@ void capwap_logging_printf(int level, const char* format, ...) {
#endif #endif
va_end(args); va_end(args);
errno = errsv;
} }
void capwap_logging_hexdump(int level, const char *title, const unsigned char *data, size_t len) void capwap_logging_hexdump(int level, const char *title, const unsigned char *data, size_t len)
{ {
int errsv = errno;
char prefix[256]; char prefix[256];
if ((logginglevel == CAPWAP_LOGGING_NONE) || if ((logginglevel == CAPWAP_LOGGING_NONE) ||
@ -185,6 +190,8 @@ void capwap_logging_hexdump(int level, const char *title, const unsigned char *d
#ifdef CAPWAP_MULTITHREADING_ENABLE #ifdef CAPWAP_MULTITHREADING_ENABLE
capwap_lock_exit(&l_loglock); capwap_lock_exit(&l_loglock);
#endif #endif
errno = errsv;
} }
#endif #endif