Hi All,

I'm trying to memory map a file. Does OpenSSL BIO's allow this?

I seem to be failing on BIO_read_filename with a `ret` of 0. The docs
state I should expect `ret` of 1. When I look for the problem, I'm
getting an error code of 0 (`err`, success).

I ask because the doc's appear to be incorrect on the return type of
BIO_read_filename. When I try and use an `int`, I get a size warning
(long instead of int). So I suspect the docs may be wrong.
http://www.openssl.org/docs/crypto/BIO_s_file.html.

Jeff

bio = BIO_new(BIO_s_mem());
// BIO is not NULL

ret = BIO_read_filename(bio, "filename.pem");
err = ERR_get_error();
// ret is 0, err is 0
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