[#BIO_new_fd]
= BIO_new_fd
:mrdocs:

Create a file‐descriptor BIO wrapping an existing OS descriptor.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO.adoc[BIO]*
BIO_new_fd(
    int fd,
    int close_flag);
----

== Return Value

Newly allocated fd BIO, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fd*
| File descriptor to wrap.
| *close_flag*
| BIO_CLOSE to close `fd` on BIO_free(), or BIO_NOCLOSE.
|===


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