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-.\"     $OpenBSD: BIO_read.3,v 1.8 2018/03/27 17:35:50 schwarze Exp $
-.\"     OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2016 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: March 27 2018 $
-.Dt BIO_READ 3
-.Os
-.Sh NAME
-.Nm BIO_read ,
-.Nm BIO_gets ,
-.Nm BIO_write ,
-.Nm BIO_puts
-.Nd BIO I/O functions
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Ft int
-.Fo BIO_read
-.Fa "BIO *b"
-.Fa "void *buf"
-.Fa "int len"
-.Fc
-.Ft int
-.Fo BIO_gets
-.Fa "BIO *b"
-.Fa "char *buf"
-.Fa "int size"
-.Fc
-.Ft int
-.Fo BIO_write
-.Fa "BIO *b"
-.Fa "const void *buf"
-.Fa "int len"
-.Fc
-.Ft int
-.Fo BIO_puts
-.Fa "BIO *b"
-.Fa "const char *buf"
-.Fc
-.Sh DESCRIPTION
-.Fn BIO_read
-attempts to read
-.Fa len
-bytes from BIO
-.Fa b
-and places the data in
-.Fa buf .
-.Pp
-.Fn BIO_gets
-performs the BIOs "gets" operation and places the data in
-.Fa buf .
-Usually this operation will attempt to read a line of data
-from the BIO of maximum length
-.Fa len No - 1 .
-There are exceptions to this however, for example
-.Fn BIO_gets
-on a digest BIO will calculate and return the digest
-and other BIOs may not support
-.Fn BIO_gets
-at all.
-The returned string is always NUL-terminated.
-.Pp
-.Fn BIO_write
-attempts to write
-.Fa len
-bytes from
-.Fa buf
-to BIO
-.Fa b .
-.Pp
-.Fn BIO_puts
-attempts to write a null terminated string
-.Fa buf
-to BIO
-.Fa b .
-.Pp
-One technique sometimes used with blocking sockets
-is to use a system call (such as
-.Xr select 2 ,
-.Xr poll 2
-or equivalent) to determine when data is available and then call
-.Xr read 2
-to read the data.
-The equivalent with BIOs (that is call
-.Xr select 2
-on the underlying I/O structure and then call
-.Fn BIO_read
-to read the data) should
-.Em not
-be used because a single call to
-.Fn BIO_read
-can cause several reads (and writes in the case of SSL BIOs)
-on the underlying I/O structure and may block as a result.
-Instead
-.Xr select 2
-(or equivalent) should be combined with non-blocking I/O
-so successive reads will request a retry instead of blocking.
-.Pp
-See
-.Xr BIO_should_retry 3
-for details of how to determine the cause of a retry and other I/O issues.
-.Pp
-If the
-.Fn BIO_gets
-function is not supported by a BIO then it is possible to
-work around this by adding a buffering BIO
-.Xr BIO_f_buffer 3
-to the chain.
-.Sh RETURN VALUES
-All these functions return either the amount of data successfully
-read or written (if the return value is positive) or that no data
-was successfully read or written if the result is 0 or -1.
-If the return value is -2, then the operation is not implemented
-in the specific BIO type.
-The trailing NUL is not included in the length returned by
-.Fn BIO_gets .
-.Pp
-A 0 or -1 return is not necessarily an indication of an error.
-In particular when the source/sink is non-blocking or of a certain type
-it may merely be an indication that no data is currently available and that
-the application should retry the operation later.
-.Sh SEE ALSO
-.Xr BIO_meth_new 3 ,
-.Xr BIO_new 3 ,
-.Xr BIO_should_retry 3
-.Sh HISTORY
-.Fn BIO_read ,
-.Fn BIO_gets ,
-.Fn BIO_write ,
-and
-.Fn BIO_puts
-first appeared in SSLeay 0.6.0 and have been available since
-.Ox 2.4 .