memtrail.h

/**************************************************************************
 *
 * Copyright 2011-2014 Jose Fonseca
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 **************************************************************************/


#ifndef _MEMTRAIL_H_
#define _MEMTRAIL_H_


#ifdef __linux__


#include <stdint.h>
#include <dlfcn.h>


static void
_memtrail_snapshot_init(void);

typedef void (*_memtrail_snapshot_ptr)(void);

static _memtrail_snapshot_ptr
memtrail_snapshot = &_memtrail_snapshot_init;

static void
_memtrail_snapshot_noop(void) {
}

static inline void
_memtrail_snapshot_init(void) {
   _memtrail_snapshot_ptr ptr = (_memtrail_snapshot_ptr)(uintptr_t)dlsym(RTLD_DEFAULT, "memtrail_snapshot");
   memtrail_snapshot = ptr ? ptr : &_memtrail_snapshot_noop;
   memtrail_snapshot();
}


#else /* !__linux__ */


static void
memtrail_snapshot(void) {
}


#endif /* !__linux__ */


#endif /* _MEMTRAIL_H_ */