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-.\" $OpenBSD: BIO_s_fd.3,v 1.13 2023/11/16 20:19:23 schwarze Exp $
-.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2022 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" The original 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: November 16 2023 $
-.Dt BIO_S_FD 3
-.Os
-.Sh NAME
-.Nm BIO_s_fd ,
-.Nm BIO_set_fd ,
-.Nm BIO_get_fd ,
-.Nm BIO_new_fd ,
-.Nm BIO_fd_non_fatal_error ,
-.Nm BIO_fd_should_retry
-.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
-.Ft int
-.Fn BIO_fd_non_fatal_error "int errnum"
-.Ft int
-.Fn BIO_fd_should_retry "int retval"
-.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 .
-.Pp
-.Fn BIO_get_fd
-places the file descriptor in
-.Fa c
-if it is not
-.Dv NULL
-and also returns the file descriptor.
-.Pp
-.Fn BIO_new_fd
-returns a file descriptor BIO using
-.Fa fd
-and
-.Fa close_flag .
-.Pp
-.Fn BIO_fd_non_fatal_error
-determines whether the error status code
-.Fa errnum
-represents a recoverable error.
-.Fn BIO_fd_should_retry
-determines whether a recoverable error occurred by inspecting both
-.Xr errno 2
-and
-.Fa retval ,
-which is supposed to usually be
-the return value of a previously called function like
-.Xr BIO_read 3
-or
-.Xr BIO_write 3 .
-These two functions are mostly used internally; in application code,
-it is usually easier and more robust to use
-.Xr BIO_should_retry 3 ,
-which works for any BIO type.
-.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
-.Xr BIO_ctrl 3
-.Fa cmd
-arguments correspond to macros as follows:
-.Bl -column BIO_CTRL_GET_CLOSE BIO_get_close(3) -offset 3n
-.It Fa cmd No constant    Ta corresponding macro
-.It Dv BIO_C_FILE_SEEK    Ta Xr BIO_seek 3
-.It Dv BIO_C_FILE_TELL    Ta Xr BIO_tell 3
-.It Dv BIO_C_GET_FD       Ta Fn BIO_get_fd
-.It Dv BIO_C_SET_FD       Ta Fn BIO_set_fd
-.It Dv BIO_CTRL_GET_CLOSE Ta Xr BIO_get_close 3
-.It Dv BIO_CTRL_RESET     Ta Xr BIO_reset 3
-.It Dv BIO_CTRL_SET_CLOSE Ta Xr BIO_set_close 3
-.El
-.Sh RETURN VALUES
-.Fn BIO_s_fd
-returns the file descriptor BIO method.
-.Pp
-When called on a file descriptor BIO object,
-.Xr BIO_method_type 3
-returns the constant
-.Dv BIO_TYPE_FD
-and
-.Xr BIO_method_name 3
-returns a pointer to the static string
-.Qq file descriptor .
-.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.
-.Pp
-.Fn BIO_fd_non_fatal_error
-returns 1 if
-.Fa errnum
-is
-.Dv EAGAIN ,
-.Dv EALREADY ,
-.Dv EINPROGRESS ,
-.Dv EINTR ,
-or
-.Dv ENOTCONN
-and 0 otherwise, even if
-.Fa errnum
-is 0.
-.Pp
-.Fn BIO_fd_should_retry
-returns 1 if
-.Fn BIO_fd_non_fatal_error errno
-is 1 and
-.Fa retval
-is either 0 or \-1, or 0 otherwise.
-.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 ,
-.Xr BIO_should_retry 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_fd_should_retry
-in SSLeay 0.6.5, and
-.Fn BIO_new_fd
-and
-.Fn BIO_fd_non_fatal_error
-in SSLeay 0.8.0.
-All these functions have been available since
-.Ox 2.4 .