isfdtype(3) [linux man page]

ISFDTYPE(3)						     Linux Programmer's Manual						       ISFDTYPE(3)

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)

Linux								    2014-03-13							       ISFDTYPE(3)

DIRFD(3)						     Linux Programmer's Manual							  DIRFD(3)

NAME

       dirfd - get directory stream file descriptor

SYNOPSIS

       #include <sys/types.h>
       #include <dirent.h>

       int dirfd(DIR *dirp);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       dirfd():
	   Since glibc 2.10:
	       _BSD_SOURCE || _SVID_SOURCE || _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700
	   Before glibc 2.10:
	       _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

       The function dirfd() returns the file descriptor associated with the directory stream dirp.

       This descriptor is the one used internally by the directory stream.  As a result, it is only useful for functions which do not depend on or
       alter the file position, such as fstat(2) and fchdir(2).  It will be automatically closed when closedir(3) is called.

RETURN VALUE

       On success, a nonnegative file descriptor is returned.  On error, -1 is returned.

ERRORS

       POSIX.1-2008 specifies two errors, neither of which is returned by the current implementation.

       EINVAL dirp does not refer to a valid directory stream.

       ENOTSUP
	      The implementation does not support the association of a file descriptor with a directory.

CONFORMING TO

       POSIX.1-2008.  This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.

NOTES

       The prototype for dirfd() is only available if _BSD_SOURCE or _SVID_SOURCE is defined.

SEE ALSO

       open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2010-09-20								  DIRFD(3)