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#include <windows.h>
#include <syslog.h>
#include "event_logging.h"
#include "common/code_environment.h"
static HANDLE g_event_source = NULL;
bool get_event_source()
{
if (!g_event_source) {
HANDLE temp = RegisterEventSourceA(NULL, get_process_name_cpp().c_str());
if (!temp)
return false;
if (InterlockedCompareExchangePointer(&g_event_source, temp, NULL)) {
// There already was an event source, let's cleanup the one that we've
// just created.
DeregisterEventSource(temp);
}
}
return true;
}
void write_event_log_entry(int level, const char* msg)
{
if (!get_event_source()) {
return;
}
WORD type;
DWORD event_id;
switch (level) {
case LOG_DEBUG:
event_id = SUCCESS_EVENTMSG;
type = EVENTLOG_SUCCESS;
break;
case LOG_INFO:
case LOG_NOTICE:
event_id = INFO_EVENTMSG;
type = EVENTLOG_INFORMATION_TYPE;
break;
case LOG_WARNING:
event_id = WARN_EVENTMSG;
type = EVENTLOG_WARNING_TYPE;
break;
default:
event_id = ERROR_EVENTMSG;
type = EVENTLOG_ERROR_TYPE;
}
ReportEventA(g_event_source, type,
0, event_id, NULL, 1, 0, &msg, NULL);
}
void syslog(int priority, const char* format, ...)
{
va_list args;
va_start(args, format);
size_t length = (size_t)_vscprintf(format, args) + 1;
char* buffer = (char*) malloc(length);
if (NULL == buffer) {
va_end(args);
return;
}
vsnprintf_s(buffer, length, length - 1, format, args);
va_end(args);
write_event_log_entry(LOG_PRI(priority), buffer);
free(buffer);
}
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