logging: add use_syslog to qlog_setup

This causes qlog to log to syslog instead of logging to stderr.

Signed-off-by: Eric Caruso <ejcaruso@chromium.org>

lib/logging.c

@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <syslog.h>
@@ -7,9 +8,12 @@
 static const char default_tag[] = "libqrtr";
 static const char *current_tag = default_tag;
 
-void qlog_setup(const char *tag)
+static bool logging_to_syslog = false;
+
+void qlog_setup(const char *tag, bool use_syslog)
 {
 	current_tag = tag;
+	logging_to_syslog = use_syslog;
 }
 
 static const char *get_priority_string(int priority)
@@ -37,13 +41,18 @@ static const char *get_priority_string(int priority)
 
 void qlog(int priority, const char *format, ...)
 {
-	char buf[QLOG_BUF_SIZE];
 	va_list ap;
-
 	va_start(ap, format);
-	vsnprintf(buf, QLOG_BUF_SIZE, format, ap);
-	va_end(ap);
 
-	fprintf(stderr, "%s %s: %s\n",
-	        get_priority_string(priority), current_tag, buf);
+	if (logging_to_syslog) {
+		vsyslog(priority, format, ap);
+	} else {
+		char buf[QLOG_BUF_SIZE];
+		vsnprintf(buf, QLOG_BUF_SIZE, format, ap);
+
+		fprintf(stderr, "%s %s: %s\n",
+		        get_priority_string(priority), current_tag, buf);
+	}
+
+	va_end(ap);
 }

lib/logging.h

@@ -1,6 +1,7 @@
 #ifndef _QRTR_LOGGING_H_
 #define _QRTR_LOGGING_H_
 
+#include <stdbool.h>
 #include <stdlib.h>
 #include <syslog.h>
 
@@ -10,7 +11,7 @@
 #define __PRINTF__(fmt, args)
 #endif
 
-void qlog_setup(const char *tag);
+void qlog_setup(const char *tag, bool use_syslog);
 
 void qlog(int priority, const char *format, ...) __PRINTF__(2, 3);
 

src/cfg.c

@@ -29,7 +29,7 @@ int main(int argc, char **argv)
 	char *ep;
 	const char *progname = basename(argv[0]);
 
-	qlog_setup(progname);
+	qlog_setup(progname, false);
 
 	if (argc != 2)
 		usage(progname);

src/lookup.c

@@ -107,7 +107,7 @@ int main(int argc, char **argv)
 	int rc;
 	const char *progname = basename(argv[0]);
 
-	qlog_setup(progname);
+	qlog_setup(progname, false);
 
 	rc = 0;
 	memset(&pkt, 0, sizeof(pkt));

src/ns.c

@@ -705,7 +705,7 @@ int main(int argc, char **argv)
 	int rc;
 	const char *progname = basename(argv[0]);
 
-	qlog_setup(progname);
+	qlog_setup(progname, false);
 
 	while ((opt = getopt(argc, argv, "f")) != -1) {
 		switch (opt) {