blob: dbe5309da8af31799af03602e82b904adf56c851 [file] [log] [blame] [edit]
/*
* Copyright (C) 2017 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.
*/
/*
* stderr write handler. Output is logcat-like, and responds to
* logcat's environment variables ANDROID_PRINTF_LOG and
* ANDROID_LOG_TAGS to filter output.
*
* This transport only provides a writer, that means that it does not
* provide an End-To-End capability as the logs are effectively _lost_
* to the stderr file stream. The purpose of this transport is to
* supply a means for command line tools to report their logging
* to the stderr stream, in line with all other activities.
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <log/event_tag_map.h>
#include <log/log.h>
#include <log/logprint.h>
#include <log/uio.h>
#include "log_portability.h"
#include "logger.h"
static int stderrOpen();
static void stderrClose();
static int stderrAvailable(log_id_t logId);
static int stderrWrite(log_id_t logId, struct timespec* ts, struct iovec* vec,
size_t nr);
struct stderrContext {
AndroidLogFormat* logformat;
#if defined(__ANDROID__)
EventTagMap* eventTagMap;
#endif
};
LIBLOG_HIDDEN struct android_log_transport_write stderrLoggerWrite = {
.node = { &stderrLoggerWrite.node, &stderrLoggerWrite.node },
.context.priv = NULL,
.name = "stderr",
.available = stderrAvailable,
.open = stderrOpen,
.close = stderrClose,
.write = stderrWrite,
};
static int stderrOpen() {
struct stderrContext* ctx;
const char* envStr;
bool setFormat;
if (!stderr || (fileno(stderr) < 0)) {
return -EBADF;
}
if (stderrLoggerWrite.context.priv) {
return fileno(stderr);
}
ctx = calloc(1, sizeof(struct stderrContext));
if (!ctx) {
return -ENOMEM;
}
ctx->logformat = android_log_format_new();
if (!ctx->logformat) {
free(ctx);
return -ENOMEM;
}
envStr = getenv("ANDROID_PRINTF_LOG");
setFormat = false;
if (envStr) {
char* formats = strdup(envStr);
char* sv = NULL;
char* arg = formats;
while (!!(arg = strtok_r(arg, ",:; \t\n\r\f", &sv))) {
AndroidLogPrintFormat format = android_log_formatFromString(arg);
arg = NULL;
if (format == FORMAT_OFF) {
continue;
}
if (android_log_setPrintFormat(ctx->logformat, format) <= 0) {
continue;
}
setFormat = true;
}
free(formats);
}
if (!setFormat) {
AndroidLogPrintFormat format = android_log_formatFromString("threadtime");
android_log_setPrintFormat(ctx->logformat, format);
}
envStr = getenv("ANDROID_LOG_TAGS");
if (envStr) {
android_log_addFilterString(ctx->logformat, envStr);
}
stderrLoggerWrite.context.priv = ctx;
return fileno(stderr);
}
static void stderrClose() {
struct stderrContext* ctx = stderrLoggerWrite.context.priv;
if (ctx) {
stderrLoggerWrite.context.priv = NULL;
if (ctx->logformat) {
android_log_format_free(ctx->logformat);
ctx->logformat = NULL;
}
#if defined(__ANDROID__)
if (ctx->eventTagMap) {
android_closeEventTagMap(ctx->eventTagMap);
ctx->eventTagMap = NULL;
}
#endif
}
}
static int stderrAvailable(log_id_t logId) {
if ((logId >= LOG_ID_MAX) || (logId == LOG_ID_KERNEL)) {
return -EINVAL;
}
return 1;
}
static int stderrWrite(log_id_t logId, struct timespec* ts, struct iovec* vec,
size_t nr) {
struct log_msg log_msg;
AndroidLogEntry entry;
char binaryMsgBuf[1024];
int err;
size_t i;
struct stderrContext* ctx = stderrLoggerWrite.context.priv;
if (!ctx) return -EBADF;
if (!vec || !nr) return -EINVAL;
log_msg.entry.len = 0;
log_msg.entry.hdr_size = sizeof(log_msg.entry);
log_msg.entry.pid = getpid();
#ifdef __BIONIC__
log_msg.entry.tid = gettid();
#else
log_msg.entry.tid = getpid();
#endif
log_msg.entry.sec = ts->tv_sec;
log_msg.entry.nsec = ts->tv_nsec;
log_msg.entry.lid = logId;
log_msg.entry.uid = __android_log_uid();
for (i = 0; i < nr; ++i) {
size_t len = vec[i].iov_len;
if ((log_msg.entry.len + len) > LOGGER_ENTRY_MAX_PAYLOAD) {
len = LOGGER_ENTRY_MAX_PAYLOAD - log_msg.entry.len;
}
if (!len) continue;
memcpy(log_msg.entry.msg + log_msg.entry.len, vec[i].iov_base, len);
log_msg.entry.len += len;
}
if ((logId == LOG_ID_EVENTS) || (logId == LOG_ID_SECURITY)) {
#if defined(__ANDROID__)
if (!ctx->eventTagMap) {
ctx->eventTagMap = android_openEventTagMap(NULL);
}
#endif
err = android_log_processBinaryLogBuffer(&log_msg.entry_v1, &entry,
#if defined(__ANDROID__)
ctx->eventTagMap,
#else
NULL,
#endif
binaryMsgBuf, sizeof(binaryMsgBuf));
} else {
err = android_log_processLogBuffer(&log_msg.entry_v1, &entry);
}
/* print known truncated data, in essence logcat --debug */
if ((err < 0) && !entry.message) return -EINVAL;
if (!android_log_shouldPrintLine(ctx->logformat, entry.tag, entry.priority)) {
return log_msg.entry.len;
}
err = android_log_printLogLine(ctx->logformat, fileno(stderr), &entry);
if (err < 0) return errno ? -errno : -EINVAL;
return log_msg.entry.len;
}