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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2018, Google Inc.
*
* log.cpp - Logging infrastructure
*/
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <iomanip>
#include <string.h>
#include "log.h"
#include "utils.h"
/**
* \file log.h
* \brief Logging infrastructure
*/
namespace libcamera {
/**
* \enum LogSeverity
* Log message severity
* \var LogDebug
* Debug message
* \var LogInfo
* Informational message
* \var LogWarning
* Warning message, signals a potential issue
* \var LogError
* Error message, signals an unrecoverable issue
* \var LogFatal
* Fatal message, signals an unrecoverable issue and aborts execution
*/
/**
* \def LOG(severity)
* \brief Log a message
*
* Return an std::ostream reference to which a message can be logged using the
* iostream API. The \a severity controls whether the message is printed or
* dropped, depending on the global log level.
*
* If the severity is set to Fatal, execution is aborted and the program
* terminates immediately after printing the message.
*/
/**
* \def ASSERT(condition)
* \brief Abort program execution if assertion fails
*
* If \a condition is false, ASSERT() logs an error message with the Fatal log
* level and aborts program execution.
*
* If the macro NDEBUG is defined before including log.h, ASSERT() generates no
* code.
*
* Using conditions that have side effects with ASSERT() is not recommended, as
* these effects would depend on whether NDEBUG is defined or not. Similarly,
* ASSERT() should not be used to check for errors that can occur under normal
* conditions as those checks would then be removed when compiling with NDEBUG.
*/
static const char *log_severity_name(LogSeverity severity)
{
static const char * const names[] = {
" DBG",
" INFO",
" WARN",
" ERR",
"FATAL",
};
if (static_cast<unsigned int>(severity) < ARRAY_SIZE(names))
return names[severity];
else
return "UNKN";
}
/**
* \class LogMessage
* \brief Internal log message representation.
*
* The LogMessage class models a single message in the log. It serves as a
* helper to provide the std::ostream API for logging, and must never be used
* directly. Use the LOG() macro instead access the log infrastructure.
*/
/**
* \param fileName The file name where the message is logged from
* \param line The line number where the message is logged from
* \param severity The log message severity, controlling how the message will be
* displayed
*
* Create a log message pertaining to line \a line of file \a fileName. The
* \a severity argument sets the message severity to control whether it will be
* output or dropped.
*/
LogMessage::LogMessage(const char *fileName, unsigned int line,
LogSeverity severity)
: severity_(severity)
{
/* Log the timestamp, severity and file information. */
struct timespec timestamp;
clock_gettime(CLOCK_MONOTONIC, ×tamp);
msgStream.fill('0');
msgStream << "[" << timestamp.tv_sec / (60 * 60) << ":"
<< std::setw(2) << (timestamp.tv_sec / 60) % 60 << ":"
<< std::setw(2) << timestamp.tv_sec % 60 << "."
<< std::setw(9) << timestamp.tv_nsec << "]";
msgStream.fill(' ');
msgStream << " " << log_severity_name(severity);
msgStream << " " << basename(fileName) << ":" << line << " ";
}
LogMessage::~LogMessage()
{
msgStream << std::endl;
std::string msg(msgStream.str());
fwrite(msg.data(), msg.size(), 1, stderr);
fflush(stderr);
if (severity_ == LogSeverity::LogFatal)
std::abort();
}
/**
* \fn std::ostream& LogMessage::stream()
*
* Data is added to a LogMessage through the stream returned by this function.
* The stream implements the std::ostream API and can be used for logging as
* std::cout.
*
* \return A reference to the log message stream
*/
} /* namespace libcamera */
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