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-.\" Copyright (C) 2014 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH isfdtype 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-isfdtype \- test file type of a file descriptor
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/stat.h>
-.B #include <sys/socket.h>
-.PP
-.BI "int isfdtype(int " fd ", int " fdtype );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR isfdtype ():
-.nf
-    Since glibc 2.20:
-        _DEFAULT_SOURCE
-    Before glibc 2.20:
-        _BSD_SOURCE || _SVID_SOURCE
-.fi
-.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
-.I fdtype
-and 0 if it is not.
-On failure, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-The
-.BR isfdtype ()
-function can fail with any of the same errors as
-.BR fstat (2).
-.SH VERSIONS
-Portable applications should use
-.BR fstat (2)
-instead.
-.SH STANDARDS
-None.
-.SH HISTORY
-It appeared 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).
-.SH SEE ALSO
-.BR fstat (2)