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-.\"     $OpenBSD: BIO_s_fd.3,v 1.9 2018/05/01 17:05:05 schwarze Exp $
-.\"     OpenSSL 9b86974e Aug 17 15:21:33 2015 -0400
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000 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
-.\" OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: May 1 2018 $
-.Dt BIO_S_FD 3
-.Os
-.Sh NAME
-.Nm BIO_s_fd ,
-.Nm BIO_set_fd ,
-.Nm BIO_get_fd ,
-.Nm BIO_new_fd
-.Nd file descriptor BIO
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Ft const BIO_METHOD *
-.Fo BIO_s_fd
-.Fa "void"
-.Fc
-.Ft long
-.Fo BIO_set_fd
-.Fa "BIO *b"
-.Fa "int fd"
-.Fa "long close_flag"
-.Fc
-.Ft long
-.Fo BIO_get_fd
-.Fa "BIO *b"
-.Fa "int *c"
-.Fc
-.Ft BIO *
-.Fo BIO_new_fd
-.Fa "int fd"
-.Fa "int close_flag"
-.Fc
-.Sh DESCRIPTION
-.Fn BIO_s_fd
-returns the file descriptor BIO method.
-This is a wrapper around the platform's file descriptor routines such as
-.Xr read 2
-and
-.Xr write 2 .
-.Pp
-.Xr BIO_read 3
-and
-.Xr BIO_write 3
-read or write the underlying descriptor.
-.Xr BIO_puts 3
-is supported but
-.Xr BIO_gets 3
-is not.
-.Pp
-If the close flag is set,
-.Xr close 2
-is called on the underlying file descriptor when the
-.Vt BIO
-is freed.
-.Pp
-.Xr BIO_reset 3
-attempts to set the file pointer to the start of the file using
-.Fn lseek fd 0 0 .
-.Pp
-.Xr BIO_seek 3
-sets the file pointer to position
-.Fa ofs
-from start of file using
-.Fn lseek fd ofs 0 .
-.Pp
-.Xr BIO_tell 3
-returns the current file position by calling
-.Fn lseek fd 0 1 .
-.Pp
-.Fn BIO_set_fd
-sets the file descriptor of
-.Vt BIO
-.Fa b
-to
-.Fa fd
-and the close flag to
-.Fa close_flag .
-It is currently implemented as a macro.
-.Pp
-.Fn BIO_get_fd
-places the file descriptor in
-.Fa c
-if it is not
-.Dv NULL
-and also returns the file descriptor.
-It is currently implemented as a macro.
-.Pp
-.Fn BIO_new_fd
-returns a file descriptor BIO using
-.Fa fd
-and
-.Fa close_flag .
-.Pp
-The behaviour of
-.Xr BIO_read 3
-and
-.Xr BIO_write 3
-depends on the behavior of the platform's
-.Xr read 2
-and
-.Xr write 2
-calls on the descriptor.
-If the underlying file descriptor is in a non-blocking mode,
-then the BIO will behave in the manner described in the
-.Xr BIO_read 3
-and
-.Xr BIO_should_retry 3
-manual pages.
-.Pp
-File descriptor BIOs should not be used for socket I/O.
-Use socket BIOs instead.
-.Pp
-.Fn BIO_set_fd
-and
-.Fn BIO_get_fd
-are implemented as macros.
-.Sh RETURN VALUES
-.Fn BIO_s_fd
-returns the file descriptor BIO method.
-.Pp
-.Fn BIO_set_fd
-always returns 1.
-.Pp
-.Fn BIO_get_fd
-returns the file descriptor or -1 if the
-.Vt BIO
-has not been initialized.
-.Pp
-.Fn BIO_new_fd
-returns the newly allocated
-.Vt BIO
-or
-.Dv NULL
-if an error occurred.
-.Sh EXAMPLES
-This is a file descriptor BIO version of "Hello World":
-.Bd -literal -offset indent
-BIO *out;
-out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
-BIO_printf(out, "Hello World\en");
-BIO_free(out);
-.Ed
-.Sh SEE ALSO
-.Xr BIO_new 3 ,
-.Xr BIO_read 3 ,
-.Xr BIO_s_socket 3 ,
-.Xr BIO_seek 3
-.Sh HISTORY
-.Fn BIO_s_fd ,
-.Fn BIO_set_fd ,
-and
-.Fn BIO_get_fd
-first appeared in SSLeay 0.6.0.
-.Fn BIO_new_fd
-first appeared in SSLeay 0.8.0.
-All these functions have been available since
-.Ox 2.4 .