1DIRFD(3)                   Linux Programmer's Manual                  DIRFD(3)
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NAME

6       dirfd - get directory stream file descriptor
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SYNOPSIS

9       #include <sys/types.h>
10       #include <dirent.h>
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12       int dirfd(DIR *dirp);
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14   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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16       dirfd(): _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

19       The  function  dirfd()  returns the file descriptor associated with the
20       directory stream dirp.
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22       This descriptor is the one used internally by the directory stream.  As
23       a  result,  it  is  only useful for functions which do not depend on or
24       alter the file position, such as fstat(2) and fchdir(2).   It  will  be
25       automatically closed when closedir(3) is called.
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RETURN VALUE

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

32       POSIX.1-2008 specifies two errors, neither of which is returned by  the
33       current implementation.
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35       EINVAL dirp does not refer to a valid directory stream.
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37       ENOTSUP
38              The  implementation  does  not support the association of a file
39              descriptor with a directory.
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CONFORMING TO

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

46       The   prototype  for  dirfd()  is  only  available  if  _BSD_SOURCE  or
47       _SVID_SOURCE is defined.
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SEE ALSO

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

54       This  page  is  part of release 3.25 of the Linux man-pages project.  A
55       description of the project, and information about reporting  bugs,  can
56       be found at http://www.kernel.org/doc/man-pages/.
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60Linux                             2008-08-21                          DIRFD(3)
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