From: Martin Wilck <mwilck@xxxxxxxx>
By checking the log level in condlog() directly, we can simplify
dlog(). Also, it's now possible to limit the log level at compile
time by setting MAX_VERBOSITY, enabling the compiler to optimize
away log messages with higher loglevel.
Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
libmultipath/debug.c | 30 +++++++++++++-----------------
libmultipath/debug.h | 20 ++++++++++++++++----
libmultipath/devmapper.c | 4 +++-
tests/test-log.c | 4 ++--
tests/test-log.h | 3 ++-
5 files changed, 36 insertions(+), 25 deletions(-)
diff --git a/libmultipath/debug.c b/libmultipath/debug.c
index f9b7755..429f269 100644
--- a/libmultipath/debug.c
+++ b/libmultipath/debug.c
@@ -18,29 +18,25 @@
int logsink;
int libmp_verbosity = DEFAULT_VERBOSITY;
-void dlog (int sink, int prio, const char * fmt, ...)
+void dlog(int prio, const char * fmt, ...)
{
va_list ap;
va_start(ap, fmt);
+ if (logsink != LOGSINK_SYSLOG) {
+ if (logsink == LOGSINK_STDERR_WITH_TIME) {
+ time_t t = time(NULL);
+ struct tm *tb = localtime(&t);
+ char buff[16];
- if (prio <= libmp_verbosity) {
- if (sink != LOGSINK_SYSLOG) {
- if (sink == LOGSINK_STDERR_WITH_TIME) {
- time_t t = time(NULL);
- struct tm *tb = localtime(&t);
- char buff[16];
-
- strftime(buff, sizeof(buff),
- "%b %d %H:%M:%S", tb);
- buff[sizeof(buff)-1] = '\0';
-
- fprintf(stderr, "%s | ", buff);
- }
- vfprintf(stderr, fmt, ap);
+ strftime(buff, sizeof(buff),
+ "%b %d %H:%M:%S", tb);
+ buff[sizeof(buff)-1] = '\0';
+ fprintf(stderr, "%s | ", buff);
}
- else
- log_safe(prio + 3, fmt, ap);
+ vfprintf(stderr, fmt, ap);
}
+ else
+ log_safe(prio + 3, fmt, ap);
va_end(ap);
}
diff --git a/libmultipath/debug.h b/libmultipath/debug.h
index b6ce70a..705a5d7 100644
--- a/libmultipath/debug.h
+++ b/libmultipath/debug.h
@@ -1,5 +1,7 @@
-void dlog (int sink, int prio, const char * fmt, ...)
- __attribute__((format(printf, 3, 4)));
+#ifndef _DEBUG_H
+#define _DEBUG_H
+void dlog (int prio, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
#include <pthread.h>
@@ -10,11 +12,21 @@ void dlog (int sink, int prio, const char * fmt, ...)
extern int logsink;
extern int libmp_verbosity;
-#define condlog(prio, fmt, args...) \
- dlog(logsink, prio, fmt "\n", ##args)
+#ifndef MAX_VERBOSITY
+#define MAX_VERBOSITY 4
+#endif
enum {
LOGSINK_STDERR_WITH_TIME = 0,
LOGSINK_STDERR_WITHOUT_TIME = -1,
LOGSINK_SYSLOG = 1,
};
+
+#define condlog(prio, fmt, args...) \
+ do { \
+ int __p = (prio); \
+ \
+ if (__p <= MAX_VERBOSITY && __p <= libmp_verbosity) \
+ dlog(__p, fmt "\n", ##args); \
+ } while (0)
+#endif /* _DEBUG_H */
diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index f8b180e..4977b31 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -276,7 +276,9 @@ static int dm_tgt_prereq (unsigned int *ver)
static void _init_versions(void)
{
- dlog(logsink, 3, VERSION_STRING);
+ /* Can't use condlog here because of how VERSION_STRING is defined */
+ if (3 <= libmp_verbosity)
+ dlog(3, VERSION_STRING);
init_dm_library_version();
init_dm_drv_version();
init_dm_mpath_version();
diff --git a/tests/test-log.c b/tests/test-log.c
index 1c901cb..14f25b9 100644
--- a/tests/test-log.c
+++ b/tests/test-log.c
@@ -7,8 +7,8 @@
#include "log.h"
#include "test-log.h"
-__attribute__((format(printf, 3, 0)))
-void __wrap_dlog (int sink, int prio, const char * fmt, ...)
+__attribute__((format(printf, 2, 0)))
+void __wrap_dlog (int prio, const char * fmt, ...)
{
char buff[MAX_MSG_SIZE];
va_list ap;
diff --git a/tests/test-log.h b/tests/test-log.h
index 2c878c6..6d22cd2 100644
--- a/tests/test-log.h
+++ b/tests/test-log.h
@@ -1,7 +1,8 @@
#ifndef _TEST_LOG_H
#define _TEST_LOG_H
-void __wrap_dlog (int sink, int prio, const char * fmt, ...);
+__attribute__((format(printf, 2, 0)))
+void __wrap_dlog (int prio, const char * fmt, ...);
void expect_condlog(int prio, char *string);
#endif
--
2.29.0
--
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