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/*
* Copyright (C) 2008 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 <cutils/klog.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <cutils/android_get_control_file.h>
static int klog_level = KLOG_INFO_LEVEL;
void klog_set_level(int level) {
klog_level = level;
}
static int __open_klog(void) {
static const char kmsg_device[] = "/dev/kmsg";
int ret = android_get_control_file(kmsg_device);
if (ret >= 0) return ret;
return TEMP_FAILURE_RETRY(open(kmsg_device, O_WRONLY | O_CLOEXEC));
}
#define LOG_BUF_MAX 512
void klog_writev(int level, const struct iovec* iov, int iov_count) {
if (level > klog_level) return;
static int klog_fd = __open_klog();
if (klog_fd == -1) return;
TEMP_FAILURE_RETRY(writev(klog_fd, iov, iov_count));
}
void klog_write(int level, const char* fmt, ...) {
if (level > klog_level) return;
char buf[LOG_BUF_MAX];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
buf[LOG_BUF_MAX - 1] = 0;
struct iovec iov[1];
iov[0].iov_base = buf;
iov[0].iov_len = strlen(buf);
klog_writev(level, iov, 1);
}
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