[#BIO_socket_wait]
= BIO_socket_wait
:mrdocs:

Wait on a socket until it is ready for I/O or until `max_time` elapses.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_socket_wait(
    int fd,
    int for_read,
    time_t max_time);
----

== Return Value

1 on success, 0 on timeout, or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fd*
| Socket file descriptor to poll.
| *for_read*
| Non‐zero to wait for readability; zero to wait for writability.
| *max_time*
| Absolute deadline as a time_t; 0 means no timeout (succeed immediately).
|===


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