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 directory 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 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

       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  set-
       ting  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 4.15 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)