ISFDTYPE
Section: Linux Programmer's Manual (3)
Updated: 2014-03-13
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NAME
isfdtype - test file type of a file descriptor
SYNOPSIS
#include <sys/stat.h>
#include <sys/socket.h>
int isfdtype(int fd, int fdtype);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
isfdtype():
-
- Since glibc 2.20:
-
_DEFAULT_SOURCE
- Before glibc 2.20:
-
_BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
The
isfdtype()
function tests whether the file descriptor
fd
refers to a file of type
fdtype.
The
fdtype
argument specifies one of the
S_IF*
constants defined in
<sys/stat.h>
and documented in
stat(2)
(e.g.,
S_IFREG).
RETURN VALUE
The
isfdtype()
function returns 1 if the file descriptor
fd
is of type
fdtype
and 0 if it is not.
On error, -1 is returned and
errno
is set to indicate the cause.
ERRORS
The
isfdtype()
function can fail with any of the same errors as
fstat(3).
CONFORMING TO
The
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
<sys/stat.h>,
as shown in the POSIX.1g draft),
and possibly other systems.
NOTES
Portable applications should use
fstat(3)
instead.
SEE ALSO
fstat(3)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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