opendir(3)



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

NAME
       opendir, fdopendir - open a directory

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

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

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

       fdopendir():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

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 The per-process limit on the number of open file descriptors has
              been reached.

       ENFILE The system-wide limit on the total number of open files has been
              reached.

       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  at-
       tributes(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
       Filename entries can be read from a directory stream using readdir(3).

       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 de-
       scriptor 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 4.16 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/.

GNU                               2017-09-15                        OPENDIR(3)

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