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    Command:

    dirfd

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <dirent.h>
    
           int dirfd(DIR *dirp);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           dirfd():
               _BSD_SOURCE || _SVID_SOURCE
               || /* Since glibc 2.10: */
                   (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
    
    
    

    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  useful only 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, and errno is set to indicate the cause of the error.
    
    
    

    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.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The dirfd() function is thread-safe.
    
    
    

    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  available  only  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)
    
    
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