/usr/include/enet/callbacks.h is in libenet-dev 1.3.12+ds-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | /** 
 @file  callbacks.h
 @brief ENet callbacks
*/
#ifndef __ENET_CALLBACKS_H__
#define __ENET_CALLBACKS_H__
#include <stdlib.h>
typedef struct _ENetCallbacks
{
    void * (ENET_CALLBACK * malloc) (size_t size);
    void (ENET_CALLBACK * free) (void * memory);
    void (ENET_CALLBACK * no_memory) (void);
} ENetCallbacks;
/** @defgroup callbacks ENet internal callbacks
    @{
    @ingroup private
*/
extern void * enet_malloc (size_t);
extern void   enet_free (void *);
/** @} */
#endif /* __ENET_CALLBACKS_H__ */
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