Usage of macro OPENSSL_NO_STDIO

[Kchitiz Saxena]

Hi
Can somebody briefly explain the use of macro OPENSSL_NO_STDIO. There are
few functions like SSL_CTX_use_certificate_file() which are defined only if
this macro is not defined. What is the functionality which is derived out of
this macro definition. In short, what I get/loose if I define this macro
while compiling this macro.

Thanks
Kchitiz