Name
fileno — obtain file descriptor of a stdio stream
Synopsis
#include <stdio.h>
int
fileno( |
FILE *stream); |
![[Note]](../stylesheet/note.png) |
Note | ||
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DESCRIPTION
The function fileno()
examines the argument stream and returns the integer
file descriptor used to implement this stream. The file
descriptor is still owned by stream and will be closed when
fclose(3) is called.
Duplicate the file descriptor with dup(2) before passing it to
code that might close it.
For the nonlocking counterpart, see unlocked_stdio(3).
RETURN VALUE
On success, fileno() returns
the file descriptor associated with stream. On failure, −1 is
returned and errno is set to
indicate the error.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
fileno() |
Thread safety | MT-Safe |
COLOPHON
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description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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Copyright (c) 1990, 1991 The Regents of the University of California. and Copyright (C) 2021 Michael Kerrisk <mtk.manpagesgmail.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. %%%LICENSE_START(BSD_4_CLAUSE_UCB) 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 acknowledgement: This product includes software developed by the University of California, Berkeley and its contributors. 4. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS 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 REGENTS OR 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. %%%LICENSE_END Converted for Linux, Mon Nov 29 14:24:40 1993, faithcs.unc.edu Added remark on EBADF for fileno, aeb, 2001-03-22 |