blob: 710dc6669cb4a987b11d4e8ef0b0e04e475fbb16 [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
27#include <cutils/klog.h>
28
29static int klog_fd = -1;
30static 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 Hughesda40c002015-03-27 23:20:44 -070040void klog_init(void) {
Ken Sumrall7425fd12013-04-03 13:43:11 -070041 if (klog_fd >= 0) return; /* Already initialized */
42
Nick Kralevich4d32a482015-05-18 18:41:23 -070043 klog_fd = open("/dev/kmsg", O_WRONLY | O_CLOEXEC);
44 if (klog_fd >= 0) {
45 return;
46 }
47
Elliott Hughesc02f81c2015-03-28 09:51:54 -070048 static const char* name = "/dev/__kmsg__";
Dima Zavin8f912822011-08-31 18:26:17 -070049 if (mknod(name, S_IFCHR | 0600, (1 << 8) | 11) == 0) {
Elliott Hughesda40c002015-03-27 23:20:44 -070050 klog_fd = open(name, O_WRONLY | O_CLOEXEC);
Dima Zavin8f912822011-08-31 18:26:17 -070051 unlink(name);
52 }
53}
54
55#define LOG_BUF_MAX 512
56
Elliott Hughesda40c002015-03-27 23:20:44 -070057void klog_writev(int level, const struct iovec* iov, int iov_count) {
Dima Zavin8f912822011-08-31 18:26:17 -070058 if (level > klog_level) return;
Ken Sumrall7425fd12013-04-03 13:43:11 -070059 if (klog_fd < 0) klog_init();
Todd Poynor451a6ba2013-04-19 12:48:19 -070060 if (klog_fd < 0) return;
Elliott Hughesda40c002015-03-27 23:20:44 -070061 TEMP_FAILURE_RETRY(writev(klog_fd, iov, iov_count));
Dima Zavin8f912822011-08-31 18:26:17 -070062}
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050063
Elliott Hughesda40c002015-03-27 23:20:44 -070064void klog_write(int level, const char* fmt, ...) {
65 char buf[LOG_BUF_MAX];
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050066 va_list ap;
67 va_start(ap, fmt);
Elliott Hughesda40c002015-03-27 23:20:44 -070068 vsnprintf(buf, sizeof(buf), fmt, ap);
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050069 va_end(ap);
Elliott Hughesda40c002015-03-27 23:20:44 -070070
71 buf[LOG_BUF_MAX - 1] = 0;
72
73 struct iovec iov[1];
74 iov[0].iov_base = buf;
75 iov[0].iov_len = strlen(buf);
76 klog_writev(level, iov, 1);
Stephen Smalleyeb3f4212014-02-12 16:17:00 -050077}