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/**
* Logging facility for debug/info messages.
* _EGL_FATAL messages are printed to stderr
* The EGL_LOG_LEVEL var controls the output of other warning/info/debug msgs.
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "egllog.h"
#include "eglmutex.h"
#define MAXSTRING 1000
#define FALLBACK_LOG_LEVEL _EGL_WARNING
static struct {
_EGLMutex mutex;
EGLBoolean initialized;
EGLint level;
_EGLLogProc logger;
EGLint num_messages;
} logging = {
_EGL_MUTEX_INITIALIZER,
EGL_FALSE,
FALLBACK_LOG_LEVEL,
NULL,
0
};
static const char *level_strings[] = {
/* the order is important */
"fatal",
"warning",
"info",
"debug",
NULL
};
/**
* Set the function to be called when there is a message to log.
* Note that the function will be called with an internal lock held.
* Recursive logging is not allowed.
*/
void
_eglSetLogProc(_EGLLogProc logger)
{
EGLint num_messages = 0;
_eglLockMutex(&logging.mutex);
if (logging.logger != logger) {
logging.logger = logger;
num_messages = logging.num_messages;
logging.num_messages = 0;
}
_eglUnlockMutex(&logging.mutex);
if (num_messages)
_eglLog(_EGL_DEBUG,
"New logger installed. "
"Messages before the new logger might not be available.");
}
/**
* Set the log reporting level.
*/
void
_eglSetLogLevel(EGLint level)
{
switch (level) {
case _EGL_FATAL:
case _EGL_WARNING:
case _EGL_INFO:
case _EGL_DEBUG:
_eglLockMutex(&logging.mutex);
logging.level = level;
_eglUnlockMutex(&logging.mutex);
break;
default:
break;
}
}
/**
* The default logger. It prints the message to stderr.
*/
static void
_eglDefaultLogger(EGLint level, const char *msg)
{
fprintf(stderr, "libEGL %s: %s\n", level_strings[level], msg);
}
/**
* Initialize the logging facility.
*/
static void
_eglInitLogger(void)
{
const char *log_env;
EGLint i, level = -1;
if (logging.initialized)
return;
log_env = getenv("EGL_LOG_LEVEL");
if (log_env) {
for (i = 0; level_strings[i]; i++) {
if (strcasecmp(log_env, level_strings[i]) == 0) {
level = i;
break;
}
}
}
else {
level = FALLBACK_LOG_LEVEL;
}
logging.logger = _eglDefaultLogger;
logging.level = (level >= 0) ? level : FALLBACK_LOG_LEVEL;
logging.initialized = EGL_TRUE;
/* it is fine to call _eglLog now */
if (log_env && level < 0) {
_eglLog(_EGL_WARNING,
"Unrecognized EGL_LOG_LEVEL environment variable value. "
"Expected one of \"fatal\", \"warning\", \"info\", \"debug\". "
"Got \"%s\". Falling back to \"%s\".",
log_env, level_strings[FALLBACK_LOG_LEVEL]);
}
}
/**
* Log a message with message logger.
* \param level one of _EGL_FATAL, _EGL_WARNING, _EGL_INFO, _EGL_DEBUG.
*/
void
_eglLog(EGLint level, const char *fmtStr, ...)
{
va_list args;
char msg[MAXSTRING];
/* one-time initialization; a little race here is fine */
if (!logging.initialized)
_eglInitLogger();
if (level > logging.level || level < 0)
return;
_eglLockMutex(&logging.mutex);
if (logging.logger) {
va_start(args, fmtStr);
vsnprintf(msg, MAXSTRING, fmtStr, args);
va_end(args);
logging.logger(level, msg);
logging.num_messages++;
}
_eglUnlockMutex(&logging.mutex);
if (level == _EGL_FATAL)
exit(1); /* or abort()? */
}
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