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-'\" t
-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" and Copyright (C) 2021 Michael Kerrisk <mtk.manpages@gmail.com>
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek and the American National Standards Committee X3,
-.\" on Information Processing Systems.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\" Converted for Linux, Mon Nov 29 14:24:40 1993, faith@cs.unc.edu
-.\" Added remark on EBADF for fileno, aeb, 2001-03-22
-.\"
-.TH fileno 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fileno \- obtain file descriptor of a stdio stream
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.P
-.BI "int fileno(FILE *" stream );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR fileno ():
-.nf
- _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-The function
-.BR fileno ()
-examines the argument
-.I stream
-and returns the integer file descriptor used to implement this stream.
-The file descriptor is still owned by
-.I stream
-and will be closed when
-.BR fclose (3)
-is called.
-Duplicate the file descriptor with
-.BR dup (2)
-before passing it to code that might close it.
-.P
-For the nonlocking counterpart, see
-.BR unlocked_stdio (3).
-.SH RETURN VALUE
-On success,
-.BR fileno ()
-returns the file descriptor associated with
-.IR stream .
-On failure, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I stream
-is not associated with a file.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR fileno ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH SEE ALSO
-.BR open (2),
-.BR fdopen (3),
-.BR stdio (3),
-.BR unlocked_stdio (3)