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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  directory  stream.   On
       error, NULL is returned, and errno is set appropriately.

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 attributes(7).

       ┌───────────────────────┬───────────────┬─────────┐
       │InterfaceAttributeValue   │
       ├───────────────────────┼───────────────┼─────────┤
       │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 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

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