67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "log.h"
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#include <stdlib.h>
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#include <string.h>
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#include <sys/uio.h>
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#include <selinux/selinux.h>
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#include <android-base/stringprintf.h>
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static void init_klog_vwrite(int level, const char* fmt, va_list ap) {
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static const char* tag = basename(getprogname());
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// The kernel's printk buffer is only 1024 bytes.
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// TODO: should we automatically break up long lines into multiple lines?
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// Or we could log but with something like "..." at the end?
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char buf[1024];
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size_t prefix_size = snprintf(buf, sizeof(buf), "<%d>%s: ", level, tag);
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size_t msg_size = vsnprintf(buf + prefix_size, sizeof(buf) - prefix_size, fmt, ap);
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if (msg_size >= sizeof(buf) - prefix_size) {
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msg_size = snprintf(buf + prefix_size, sizeof(buf) - prefix_size,
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"(%zu-byte message too long for printk)\n", msg_size);
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}
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iovec iov[1];
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iov[0].iov_base = buf;
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iov[0].iov_len = prefix_size + msg_size;
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klog_writev(level, iov, 1);
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}
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void init_klog_write(int level, const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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init_klog_vwrite(level, fmt, ap);
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va_end(ap);
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}
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int selinux_klog_callback(int type, const char *fmt, ...) {
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int level = KLOG_ERROR_LEVEL;
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if (type == SELINUX_WARNING) {
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level = KLOG_WARNING_LEVEL;
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} else if (type == SELINUX_INFO) {
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level = KLOG_INFO_LEVEL;
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}
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va_list ap;
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va_start(ap, fmt);
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init_klog_vwrite(level, fmt, ap);
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va_end(ap);
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return 0;
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}
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