blob: d69fb1005954df309b3a3f9c14dc449dc560d963 [file] [log] [blame]
/*
* 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 <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <cutils/klog.h>
static int klog_fd = -1;
static int klog_level = KLOG_DEFAULT_LEVEL;
void klog_set_level(int level) {
klog_level = level;
}
void klog_init(void)
{
static const char *name = "/dev/__kmsg__";
if (klog_fd >= 0) return; /* Already initialized */
if (mknod(name, S_IFCHR | 0600, (1 << 8) | 11) == 0) {
klog_fd = open(name, O_WRONLY);
if (klog_fd < 0)
return;
fcntl(klog_fd, F_SETFD, FD_CLOEXEC);
unlink(name);
}
}
#define LOG_BUF_MAX 512
void klog_write(int level, const char *fmt, ...)
{
char buf[LOG_BUF_MAX];
va_list ap;
if (level > klog_level) return;
if (klog_fd < 0) klog_init();
if (klog_fd < 0) return;
va_start(ap, fmt);
vsnprintf(buf, LOG_BUF_MAX, fmt, ap);
buf[LOG_BUF_MAX - 1] = 0;
va_end(ap);
write(klog_fd, buf, strlen(buf));
}