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.\" ========================================================================
.\"
.IX Title "BIO_SOCKET_WAIT 3ossl"
.TH BIO_SOCKET_WAIT 3ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BIO_socket_wait,
BIO_wait,
BIO_do_connect_retry
\&\- BIO connection utility functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& #ifndef OPENSSL_NO_SOCK
\& int BIO_socket_wait(int fd, int for_read, time_t max_time);
\& #endif
\& int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds);
\& int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_socket_wait()\fR waits on the socket \fBfd\fR for reading if \fBfor_read\fR is not 0,
else for writing, at most until \fBmax_time\fR.
It succeeds immediately if \fBmax_time\fR == 0 (which means no timeout given).
.PP
\&\fBBIO_wait()\fR waits at most until \fBmax_time\fR on the given (typically socket-based)
\&\fBbio\fR, for reading if \fBbio\fR is supposed to read, else for writing.
It is used by \fBBIO_do_connect_retry()\fR and can be used together \fBBIO_read\fR\|(3).
It succeeds immediately if \fBmax_time\fR == 0 (which means no timeout given).
If sockets are not available it supports polling by succeeding after sleeping
at most the given \fBnap_milliseconds\fR in order to avoid a tight busy loop.
Via \fBnap_milliseconds\fR the caller determines the polling granularity.
.PP
\&\fBBIO_do_connect_retry()\fR connects via the given \fBbio\fR.
It retries \fBBIO_do_connect()\fR as far as needed to reach a definite outcome,
i.e., connection succeeded, timeout has been reached, or an error occurred.
For nonblocking and potentially even non-socket BIOs it polls
every \fBnap_milliseconds\fR and sleeps in between using \fBBIO_wait()\fR.
If \fBnap_milliseconds\fR is < 0 then a default value of 100 ms is used.
If the \fBtimeout\fR parameter is > 0 this indicates the maximum number of seconds
to wait until the connection is established or a definite error occurred.
A value of 0 enables waiting indefinitely (i.e, no timeout),
while a value < 0 means that \fBBIO_do_connect()\fR is tried only once.
The function may, directly or indirectly, invoke \fBERR_clear_error()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_socket_wait()\fR, \fBBIO_wait()\fR, and \fBBIO_do_connect_retry()\fR
return \-1 on error, 0 on timeout, and 1 on success.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBBIO_do_connect\fR\|(3), \fBBIO_read\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBBIO_socket_wait()\fR, \fBBIO_wait()\fR, and \fBBIO_do_connect_retry()\fR
were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2019\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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