[#CRYPTO_set_mem_functions]
= CRYPTO_set_mem_functions
:mrdocs:

Install process‐wide CRYPTO memory allocator callbacks (before first allocation).

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_set_mem_functions(
    xref:CRYPTO_malloc_fn.adoc[CRYPTO_malloc_fn] malloc_fn,
    xref:CRYPTO_realloc_fn.adoc[CRYPTO_realloc_fn] realloc_fn,
    xref:CRYPTO_free_fn.adoc[CRYPTO_free_fn] free_fn);
----

== Return Value

1 on success, or 0 if allocators cannot be changed (already in use).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *malloc_fn*
| Replacement malloc, or NULL to leave the current malloc unchanged.
| *realloc_fn*
| Replacement realloc, or NULL to leave the current realloc unchanged.
| *free_fn*
| Replacement free, or NULL to leave the current free unchanged.
|===


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