blob: 45bc07b578a1f42bf784e20b9505fa123846c07c [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fbl/algorithm.h>
#include <fbl/string.h>
#include <fbl/vector.h>
#include <lib/fdio/fd.h>
#include <lib/fdio/fdio.h>
#include <lib/fdio/directory.h>
#include <lib/log/log.h>
#include <lib/log/log_writer.h>
#include <memory>
#include <stdio.h>
namespace {
// Configuration for a logger object.
// Specifies the destination to which log messages should be written.
typedef struct log_config {
// The minimum log level.
// Log messages with lower severity will be discarded.
// If this number is negative, it refers to a verbosity.
log_level_t min_level;
// The writer that logs will go to.
log_writer_t* log_writer;
// An array of tag strings to associate with all messages written
// by this logger. Tags will be truncated if they are (individually) longer
// than |LOG_MAX_TAG_LEN|.
fbl::Vector<fbl::String> tags;
} log_config_t;
std::unique_ptr<log_config_t> g_log_config_ptr =
void log_write_message_helper(log_level_t level,
size_t num_tags, const char** tags_ptr,
const char* message, size_t message_len) {
log_config_t* cfg = g_log_config_ptr.get();
if (!cfg) {
// Logging has not been initialized. Don't log anything.
fbl::Vector<const char*> static_tags;
for (size_t i = 0; i < cfg->tags.size(); i++) {
log_message_t msg = {
fbl::min(message_len, (size_t)LOG_MAX_MESSAGE_SIZE),
cfg->log_writer->ops->v1.write(cfg->log_writer, &msg);
} // namespace
bool log_level_is_enabled(log_level_t level) {
log_config_t* cfg = g_log_config_ptr.get();
return cfg && level >= cfg->min_level;
void log_set_min_level(log_level_t level) {
log_config_t* cfg = g_log_config_ptr.get();
if (cfg) {
cfg->min_level = level;
log_config_t* log_get_config(void) {
return g_log_config_ptr.get();
void log_initialize(log_level_t min_level, log_writer_t* log_writer,
const size_t num_tags, const char** tags) {
if (g_log_config_ptr.get() != nullptr) {
log_config_t* config = new log_config_t;
config->min_level = min_level;
config->log_writer = log_writer;
ZX_ASSERT(num_tags <= LOG_MAX_TAGS);
for (size_t i = 0; i < num_tags; i++) {
g_log_config_ptr = std::unique_ptr<log_config_t>(config);
void log_shutdown(void) {
g_log_config_ptr = std::unique_ptr<log_config_t>(nullptr);
void log_write_message_printf(log_level_t level,
size_t num_tags, const char** tags_ptr,
const char* format_string, ...) {
char message[LOG_MAX_MESSAGE_SIZE];
va_list args;
va_start(args, format_string);
int msg_len = vsnprintf(message, LOG_MAX_MESSAGE_SIZE, format_string, args);
if (msg_len < 0) {
// There was an error formatting. Toss the message.
log_write_message_helper(level, num_tags, tags_ptr, message, msg_len);
void log_write_message(log_level_t level,
size_t num_tags, const char** tags_ptr,
const char* message) {
size_t message_len = strlen(message);
log_write_message_helper(level, num_tags, tags_ptr, message, message_len);