[#BIO_wait]
= BIO_wait
:mrdocs:

Wait until a BIO 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_wait(
    xref:BIO.adoc[BIO]* bio,
    time_t max_time,
    unsigned int nap_milliseconds);
----

== Return Value

1 when ready, 0 on timeout, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO to poll (typically a socket or non‐blocking I/O BIO).
| *max_time*
| Absolute deadline as a time_t (0 means wait indefinitely where supported).
| *nap_milliseconds*
| Sleep quantum between polls when the BIO has no native wait.
|===


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