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CRYPTO_GET_MEM_FUNCTIONS(3) Library Functions Manual CRYPTO_GET_MEM_FUNCTIONS(3)

CRYPTO_get_mem_functions, CRYPTO_set_mem_functions, CRYPTO_mem_ctrl, CRYPTO_mem_leaks, CRYPTO_mem_leaks_fp, CRYPTO_mem_leaks_cb
legacy OpenSSL memory allocation control

#include <openssl/crypto.h>
void
CRYPTO_get_mem_functions(void *(**m)(size_t), void *(**r)(void *, size_t), void (**f)(void *));
int
CRYPTO_set_mem_functions(void *(*m)(size_t), void *(*r)(void *, size_t), void (*f)(void *));
int
CRYPTO_mem_ctrl(int mode);
int
CRYPTO_mem_leaks(BIO *b);
int
CRYPTO_mem_leaks_fp(FILE *fp);
typedef int *
CRYPTO_MEM_LEAK_CB(unsigned long, const char *, int, int, void *);
int
CRYPTO_mem_leaks_cb(CRYPTO_MEM_LEAK_CB *cb);

Do not use any of the interfaces documented here. They are provided purely for compatibility with legacy application code.
CRYPTO_get_mem_functions() assigns pointers to the C library functions malloc(3), realloc(3), and free(3) to those of its arguments that are not NULL.
CRYPTO_set_mem_functions(), CRYPTO_mem_ctrl(), CRYPTO_mem_leaks(), CRYPTO_mem_leaks_fp(), and CRYPTO_mem_leaks_cb() have no effect.

CRYPTO_set_mem_functions() always returns 0.
CRYPTO_mem_ctrl() always returns CRYPTO_MEM_CHECK_OFF.
CRYPTO_mem_leaks(), CRYPTO_mem_leaks_fp(), and CRYPTO_mem_leaks_cb() always return -1.

CRYPTO_mem_ctrl(), CRYPTO_mem_leaks(), and CRYPTO_mem_leaks_fp() first appeared in SSLeay 0.6.4. CRYPTO_get_mem_functions() and CRYPTO_set_mem_functions() first appeared in SSLeay 0.6.5. CRYPTO_mem_leaks_cb() first appeared in SSLeay 0.6.6. All these functions have all been available since OpenBSD 2.4.
August 24, 2018 OpenBSD-current