[libvirt] [PATCH v2 3/4] log: support logging using shell wildcard syntax

[Daniel P. Berrangé]

Rather than specialcasing handling of the '*' character, use fnmatch()
to get normal shell wildcard syntax, as described in 'man glob(7)'.

To get an indication of the performance impact of using globs instead
of plain string matches, a test program was written. The list of all
260 log categories was extracted from the source. Then a typical log
filters setup was picked by creating an array of the strings "qemu",
"security", "util", "cgroup", "event", "object". Every filter string
was matched against every log category. Timing information showed that
using strstr() this took 8 microseconds, while fnmatch() took 114
microseconds.

IOW, fnmatch is 14 times slower than our existing strstr check. These
numbers show a worst case scenario that wil never be hit, because it
is rare that every log category would have data output. The log category
matches are cached, so each category is only checked once no matter how
many log statements are emitted. IOW despite being slower, this will
be lost in the noise and have no consequence on real world logging
performance.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 src/util/virlog.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/util/virlog.c b/src/util/virlog.c
index 5262d613f6..be9fc0cf78 100644
--- a/src/util/virlog.c
+++ b/src/util/virlog.c
@@ -40,6 +40,7 @@
 #if HAVE_SYS_UN_H
 # include <sys/un.h>
 #endif
+#include <fnmatch.h>
 
 #include "virerror.h"
 #include "virlog.h"
@@ -508,7 +509,7 @@ virLogSourceUpdate(virLogSourcePtr source)
         size_t i;
 
         for (i = 0; i < virLogNbFilters; i++) {
-            if (strstr(source->name, virLogFilters[i]->match)) {
+            if (fnmatch(virLogFilters[i]->match, source->name, 0) == 0) {
                 priority = virLogFilters[i]->priority;
                 flags = virLogFilters[i]->flags;
                 break;
-- 
2.14.3