it's the default memory allocation function. Like
This is the memory allocation function that will be used
for sensitive data.
a function that returns 0 if the memory given is not
secure. May be NULL.
A realloc function
The function that frees allocated data. Must accept a
since 3.3.0 it is no longer possible to replace the internally used
memory allocation functions
This is the function where you set the memory allocation functions
gnutls is going to use. By default the libc's allocation functions
(malloc(), free()), are used by gnutls, to allocate both sensitive
and not sensitive data. This function is provided to set the memory
allocation functions to something other than the defaults
This function must be called before gnutls_global_init() is called.
This function is not thread safe.
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COLOPHON (which is not part of the original manual page), send a mail
gnutls 3.5.9 gnutls_global_set_mem_functions(3)