mirror of https://github.com/openssl/openssl.git
70 lines
2.5 KiB
Plaintext
70 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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BIO_socket_wait,
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BIO_wait,
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BIO_do_connect_retry
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- BIO connection utility functions
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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#ifndef OPENSSL_NO_SOCK
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int BIO_socket_wait(int fd, int for_read, time_t max_time);
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#endif
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int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds);
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int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds);
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=head1 DESCRIPTION
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BIO_socket_wait() waits on the socket B<fd> for reading if B<for_read> is not 0,
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else for writing, at most until B<max_time>.
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It succeeds immediately if B<max_time> == 0 (which means no timeout given).
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BIO_wait() waits at most until B<max_time> on the given (typically socket-based)
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B<bio>, for reading if B<bio> is supposed to read, else for writing.
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It is used by BIO_do_connect_retry() and can be used together L<BIO_read(3)>.
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It succeeds immediately if B<max_time> == 0 (which means no timeout given).
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If sockets are not available it supports polling by succeeding after sleeping
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at most the given B<nap_milliseconds> in order to avoid a tight busy loop.
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Via B<nap_milliseconds> the caller determines the polling granularity.
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BIO_do_connect_retry() connects via the given B<bio>.
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It retries BIO_do_connect() as far as needed to reach a definite outcome,
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i.e., connection succeeded, timeout has been reached, or an error occurred.
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For nonblocking and potentially even non-socket BIOs it polls
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every B<nap_milliseconds> and sleeps in between using BIO_wait().
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If B<nap_milliseconds> is < 0 then a default value of 100 ms is used.
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If the B<timeout> parameter is > 0 this indicates the maximum number of seconds
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to wait until the connection is established or a definite error occurred.
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A value of 0 enables waiting indefinitely (i.e, no timeout),
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while a value < 0 means that BIO_do_connect() is tried only once.
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The function may, directly or indirectly, invoke ERR_clear_error().
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=head1 RETURN VALUES
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BIO_socket_wait(), BIO_wait(), and BIO_do_connect_retry()
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return -1 on error, 0 on timeout, and 1 on success.
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=head1 SEE ALSO
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L<BIO_do_connect(3)>, L<BIO_read(3)>
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=head1 HISTORY
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BIO_socket_wait(), BIO_wait(), and BIO_do_connect_retry()
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were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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