[#BIO_socket]
= BIO_socket
:mrdocs:

Create a socket with optional BIO_SOCK_* behaviour flags applied.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_socket(
    int domain,
    int socktype,
    int protocol,
    int options);
----

== Return Value

New socket file descriptor on success, or ‐1 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *domain*
| Address family (for example AF_INET).
| *socktype*
| Socket type (for example SOCK_STREAM).
| *protocol*
| Protocol number, or 0 for the default for `socktype.`
| *options*
| Bitmask of BIO_SOCK_* flags (for example BIO_SOCK_NONBLOCK).
|===


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