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: _XOPEN_SOURCE >= 700 || _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 direc-
       tory 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 oth-
       erwise 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 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.

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() func-
       tion leaves the setting of the close-on-exec flag unchanged for the file descriptor, fd.  POSIX.1-200x leaves it unspeci-
       fied 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 3.25 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)