// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

//! @file nativesyslog.cpp

//! @brief Provides wrappers around the syslog apis to support exporting

//! for PInvoke calls by powershell.

//! These functions are intended only for PowerShell internal use.

//! To view log output in real time

//! On Linux

//! tail -f /var/log/syslog | grep powershell

//! On OSX

//! sudo log stream

//! NOTE: replace powershell with the LogIdentity value when overriding in configuration

#include <syslog.h>

#include <nativesyslog.h>

#if defined(__APPLE__) && defined(__MACH__)

#include <os/log.h>

#include <stdio.h>

static os_log_t _log = NULL;

// This format string ensures the message string for the log statements

// are visible. Using just %s marks them as private and the do not show

// up with log stream.

#define MESSAGE_FORMAT "%{public}s"

// The submodule name to pass to os_log_create.

// The passed in ident value will be used for the category.

// see man os_log_create

#define SUBMODULE_NAME "com.microsoft.powershell"

#endif

//! @brief Native_SysLog is a wrapper around the syslog api.

//! It explicitly passes the message as a parameter to a %s format

//! string since the message may have arbitrary characters that can

//! be misinterpreted as format specifiers.

//!

//! @retval none.

extern "C" void Native_SysLog(int32_t priority, const char* message)

{

#if defined(__APPLE__) && defined(__MACH__)

switch (priority)

{

case LOG_EMERG:

case LOG_ALERT:

case LOG_CRIT:

os_log_fault(_log, MESSAGE_FORMAT, message);

break;

case LOG_ERR:

os_log_error(_log, MESSAGE_FORMAT, message);

break;

case LOG_DEBUG:

os_log_debug(_log, MESSAGE_FORMAT, message);

break;

default:

os_log(_log, MESSAGE_FORMAT, message);

break;

}

#else

syslog(priority, "%s", message);

#endif

}

//! @brief Native_OpenLog is a wrapper around the openlog, syslog api.

//! it allows passing an ident and facility but uses an explicit

//! option value for consistent logging across powershell instances.

//!

//! @retval none.

extern "C" void Native_OpenLog(const char* ident, int facility)

{

#if defined(__APPLE__) && defined(__MACH__)

_log = os_log_create(SUBMODULE_NAME, ident);

#else

openlog(ident, LOG_NDELAY | LOG_PID, facility);

#endif

}

//! @brief Native_OpenLog is a wrapper around the closelog, syslog api.

//!

//! @retval none.

extern "C" void Native_CloseLog()

{

#if defined(__APPLE__) && defined(__MACH__)

// Nothing to do here now, for now.

#else

closelog();

#endif

}