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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);

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() 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 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()  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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2008-08-06                        OPENDIR(3)