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[linuxjm/LDP_man-pages.git] / original / man3 / isfdtype.3

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-'\" t
-.\" Copyright (C) 2014 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
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-.\" %%%LICENSE_END
-.\"
-.TH ISFDTYPE 3 2014-03-13 "Linux" "Linux Programmer's Manual"
-.SH NAME
-isfdtype \- test file type of a file descriptor
-.SH SYNOPSIS
-.nf
-.B #include <sys/stat.h>
-.B #include <sys/socket.h>
-
-.BI "int isfdtype(int " fd ", int " fdtype );
-.fi
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.BR isfdtype ():
-.ad l
-.RS 4
-.PD 0
-.TP 4
-Since glibc 2.20:
-_DEFAULT_SOURCE
-.TP 4
-Before glibc 2.20:
-_BSD_SOURCE || _SVID_SOURCE
-.PD
-.RE
-.ad b
-.SH DESCRIPTION
-The
-.BR isfdtype ()
-function tests whether the file descriptor
-.I fd
-refers to a file of type
-.IR fdtype .
-The
-.I fdtype
-argument specifies one of the
-.B S_IF*
-constants defined in
-.I <sys/stat.h>
-and documented in
-.BR stat (2)
-(e.g.,
-.BR S_IFREG ).
-.SH RETURN VALUE
-The
-.BR isfdtype ()
-function returns 1 if the file descriptor
-.I fd
-is of type
-.IR fdtype
-and 0 if it is not.
-On error, -1 is returned and
-.I errno
-is set to indicate the cause.
-.SH ERRORS
-The
-.BR isfdtype ()
-function can fail with any of the same errors as
-.BR fstat (3).
-.SH CONFORMING TO
-The
-.BR isfdtype ()
-function is not specified in any standard,
-but did appear in the draft POSIX.1g standard.
-It is present on OpenBSD and Tru64 UNIX
-(where the required header file in both cases is just
-.IR <sys/stat.h> ,
-as shown in the POSIX.1g draft),
-and possibly other systems.
-.SH NOTES
-Portable applications should use
-.BR fstat (3)
-instead.
-.SH SEE ALSO
-.BR fstat (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.