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+.\"     $OpenBSD: CRYPTO_set_mem_functions.3,v 1.1 2025/03/08 17:12:55 tb Exp $
+.\"
+.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: March 8 2025 $
+.Dt CRYPTO_GET_MEM_FUNCTIONS 3
+.Os
+.Sh NAME
+.Nm CRYPTO_get_mem_functions ,
+.Nm CRYPTO_set_mem_functions ,
+.Nm CRYPTO_mem_ctrl ,
+.Nm CRYPTO_mem_leaks ,
+.Nm CRYPTO_mem_leaks_fp ,
+.Nm CRYPTO_mem_leaks_cb
+.Nd legacy OpenSSL memory allocation control
+.Sh SYNOPSIS
+.In openssl/crypto.h
+.Ft void
+.Fo CRYPTO_get_mem_functions
+.Fa "void *(**m)(size_t)"
+.Fa "void *(**r)(void *, size_t)"
+.Fa "void (**f)(void *)"
+.Fc
+.Ft int
+.Fo CRYPTO_set_mem_functions
+.Fa "void *(*m)(size_t)"
+.Fa "void *(*r)(void *, size_t)"
+.Fa "void (*f)(void *)"
+.Fc
+.Ft int
+.Fo CRYPTO_mem_ctrl
+.Fa "int mode"
+.Fc
+.Ft int
+.Fo CRYPTO_mem_leaks
+.Fa "BIO *b"
+.Fc
+.Ft int
+.Fo CRYPTO_mem_leaks_fp
+.Fa "FILE *fp"
+.Fc
+.Ft typedef int *
+.Fo CRYPTO_MEM_LEAK_CB
+.Fa "unsigned long"
+.Fa "const char *"
+.Fa int
+.Fa int
+.Fa "void *"
+.Fc
+.Ft int
+.Fo CRYPTO_mem_leaks_cb
+.Fa "CRYPTO_MEM_LEAK_CB *cb"
+.Fc
+.Sh DESCRIPTION
+Do not use any of the interfaces documented here.
+They are provided purely for compatibility with legacy application code.
+.Pp
+.Fn CRYPTO_get_mem_functions
+assigns pointers to the C library functions
+.Xr malloc 3 ,
+.Xr realloc 3 ,
+and
+.Xr free 3
+to those of its arguments that are not
+.Dv NULL .
+.Pp
+.Fn CRYPTO_set_mem_functions ,
+.Fn CRYPTO_mem_ctrl ,
+.Fn CRYPTO_mem_leaks ,
+.Fn CRYPTO_mem_leaks_fp ,
+and
+.Fn CRYPTO_mem_leaks_cb
+have no effect.
+.Sh RETURN VALUES
+.Fn CRYPTO_set_mem_functions
+always returns 0.
+.Pp
+.Fn CRYPTO_mem_ctrl
+always returns
+.Dv CRYPTO_MEM_CHECK_OFF .
+.Pp
+.Fn CRYPTO_mem_leaks ,
+.Fn CRYPTO_mem_leaks_fp ,
+and
+.Fn CRYPTO_mem_leaks_cb
+always return -1.
+.Sh SEE ALSO
+.Xr crypto 3
+.Sh HISTORY
+.Fn CRYPTO_mem_ctrl ,
+.Fn CRYPTO_mem_leaks ,
+and
+.Fn CRYPTO_mem_leaks_fp
+first appeared in SSLeay 0.6.4.
+.Fn CRYPTO_get_mem_functions
+and
+.Fn CRYPTO_set_mem_functions
+first appeared in SSLeay 0.6.5.
+.Fn CRYPTO_mem_leaks_cb
+first appeared in SSLeay 0.6.6.
+All these functions have all been available since
+.Ox 2.4 .