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

NAME
       opendir, fdopendir - open a directory

SYNOPSIS
       #include 
       #include 

       DIR *opendir(const char *name);
       DIR *fdopendir(int fd);

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

       fdopendir():
           Since glibc 2.10:
               XOPENSOURCE >= 700 || POSIXCSOURCE >= 200809L
           Before glibc 2.10:
               GNUSOURCE

DESCRIPTION
       The  opendir()  function  opens a directory stream corresponding to the
       directory name, and returns a pointer to  the  directory  stream.   The
       stream is positioned at the first entry in the directory.

       The  fdopendir()  function  is  like opendir(), but returns a directory
       stream for the directory referred to by the open  file  descriptor  fd.
       After  a  successful  call to fdopendir(), fd is used internally by the
       implementation, and should not otherwise be used by the application.

RETURN VALUE
       The opendir() and fdopendir() functions return a pointer to the  direc‐
       tory  stream.   On  error, NULL is returned, and errno is set appropri‐
       ately.

ERRORS
       EACCES Permission denied.

       EBADF  fd is not a valid file descriptor opened for reading.

       EMFILE Too many file descriptors in use by process.

       ENFILE Too many files are currently open in the system.

       ENOENT Directory does not exist, or name is an empty string.

       ENOMEM Insufficient memory to complete the operation.

       ENOTDIR
              name is not a directory.

VERSIONS
       fdopendir() is available in glibc since version 2.4.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       ┌───────────────────────┬───────────────┬─────────┐
       │Interface              │ Attribute     │ Value   │
       ├───────────────────────┼───────────────┼─────────┤
       │opendir(), fdopendir() │ Thread safety │ MT-Safe │
       └───────────────────────┴───────────────┴─────────┘
CONFORMING TO
       opendir()  is  present  on SVr4, 4.3BSD, and specified in POSIX.1-2001.
       fdopendir() is specified in POSIX.1-2008.

NOTES
       The underlying file descriptor of the directory stream can be  obtained
       using dirfd(3).

       The  opendir()  function  sets  the  close-on-exec  flag  for  the file
       descriptor underlying the DIR *.  The fdopendir() function  leaves  the
       setting  of  the  close-on-exec flag unchanged for the file descriptor,
       fd.  POSIX.1-200x leaves it unspecified whether a  successful  call  to
       fdopendir()  will  set  the close-on-exec flag for the file descriptor,
       fd.

SEE ALSO
       open(2), closedir(3), dirfd(3), readdir(3),  rewinddir(3),  scandir(3),
       seekdir(3), telldir(3)

COLOPHON
       This  page  is  part of release 3.53 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/.



GNU                               2010-06-20                        OPENDIR(3)