Rewrite syslog(3) to use Android logging.
Since we don't have syslogd on Android and you can't run one on a non-rooted
device, it's more useful if syslog output just goes to the regular Android
logging system.
Bug: 14292866
Change-Id: Icee7f088b97f88ccbdaf471b98cbac7f19f9210a
diff --git a/libc/bionic/syslog.cpp b/libc/bionic/syslog.cpp
new file mode 100644
index 0000000..7e153eb
--- /dev/null
+++ b/libc/bionic/syslog.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <syslog.h>
+
+#include <stdlib.h>
+
+#include "private/libc_logging.h"
+
+static const char* syslog_log_tag = NULL;
+static int syslog_priority_mask = 0xff;
+
+void closelog() {
+}
+
+void openlog(const char* log_tag, int /*options*/, int /*facility*/) {
+ syslog_log_tag = log_tag;
+}
+
+int setlogmask(int new_mask) {
+ int old_mask = syslog_priority_mask;
+ // 0 is used to query the current mask.
+ if (new_mask != 0) {
+ syslog_priority_mask = new_mask;
+ }
+ return old_mask;
+}
+
+void syslog(int priority, const char* fmt, ...) {
+ va_list args;
+ va_start(args, fmt);
+ vsyslog(priority, fmt, args);
+ va_end(args);
+}
+
+void vsyslog(int priority, const char* fmt, va_list args) {
+ // Check whether we're supposed to be logging messages of this priority.
+ if ((syslog_priority_mask & LOG_MASK(LOG_PRI(priority))) == 0) {
+ return;
+ }
+
+ // What's our log tag?
+ const char* log_tag = syslog_log_tag;
+ if (log_tag == NULL) {
+ log_tag = getprogname();
+ }
+
+ // What's our Android log priority?
+ priority &= LOG_PRIMASK;
+ int android_log_priority;
+ if (priority < LOG_ERR) {
+ android_log_priority = ANDROID_LOG_ERROR;
+ } else if (priority == LOG_WARNING) {
+ android_log_priority = ANDROID_LOG_WARN;
+ } else if (priority <= LOG_INFO) {
+ android_log_priority = ANDROID_LOG_INFO;
+ } else {
+ android_log_priority = ANDROID_LOG_DEBUG;
+ }
+
+ __libc_format_log_va_list(android_log_priority, log_tag, fmt, args);
+}