blob: 4bad28a57aaf284edf65262a01afe87989d9a1ef [file] [log] [blame]
Dima Zavin8f912822011-08-31 18:26:17 -07001/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Elliott Hughesda40c002015-03-27 23:20:44 -070017#include <errno.h>
Dima Zavin8f912822011-08-31 18:26:17 -070018#include <fcntl.h>
19#include <stdarg.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
Elliott Hughesda40c002015-03-27 23:20:44 -070023#include <sys/stat.h>
24#include <sys/types.h>
Dima Zavin8f912822011-08-31 18:26:17 -070025#include <unistd.h>
26
Mark Salyzyn52bd37e2016-11-07 09:39:30 -080027#include <cutils/android_get_control_file.h>
Dima Zavin8f912822011-08-31 18:26:17 -070028#include <cutils/klog.h>
29
Dima Zavin8f912822011-08-31 18:26:17 -070030static int klog_level = KLOG_DEFAULT_LEVEL;
31
Alex Ray157e1b62014-03-07 12:18:22 -080032int klog_get_level(void) {
33 return klog_level;
34}
35
Dima Zavin8f912822011-08-31 18:26:17 -070036void klog_set_level(int level) {
37 klog_level = level;
38}
39
Elliott Hughes171a8292016-06-29 16:16:41 -070040static int __open_klog(void) {
Mark Salyzync3778432016-10-27 08:13:42 -070041 static const char kmsg_device[] = "/dev/kmsg";
42
43 int ret = android_get_control_file(kmsg_device);
44 if (ret >= 0) return ret;
45 return TEMP_FAILURE_RETRY(open(kmsg_device, O_WRONLY | O_CLOEXEC));
Dima Zavin8f912822011-08-31 18:26:17 -070046}
47
48#define LOG_BUF_MAX 512
49
Elliott Hughesda40c002015-03-27 23:20:44 -070050void klog_writev(int level, const struct iovec* iov, int iov_count) {
Dima Zavin8f912822011-08-31 18:26:17 -070051 if (level > klog_level) return;
Elliott Hughes171a8292016-06-29 16:16:41 -070052
53 static int klog_fd = __open_klog();
54 if (klog_fd == -1) return;
Elliott Hughesda40c002015-03-27 23:20:44 -070055 TEMP_FAILURE_RETRY(writev(klog_fd, iov, iov_count));
Dima Zavin8f912822011-08-31 18:26:17 -070056}
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050057
Elliott Hughesda40c002015-03-27 23:20:44 -070058void klog_write(int level, const char* fmt, ...) {
Nick Kralevich5db8d6a2016-01-16 16:19:17 -080059 if (level > klog_level) return;
Elliott Hughes171a8292016-06-29 16:16:41 -070060
Elliott Hughesda40c002015-03-27 23:20:44 -070061 char buf[LOG_BUF_MAX];
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050062 va_list ap;
63 va_start(ap, fmt);
Elliott Hughesda40c002015-03-27 23:20:44 -070064 vsnprintf(buf, sizeof(buf), fmt, ap);
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050065 va_end(ap);
Elliott Hughesda40c002015-03-27 23:20:44 -070066
67 buf[LOG_BUF_MAX - 1] = 0;
68
69 struct iovec iov[1];
70 iov[0].iov_base = buf;
71 iov[0].iov_len = strlen(buf);
72 klog_writev(level, iov, 1);
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050073}