opendir(3) — Linux manual page


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

NAME         top

       opendir, fdopendir - open a directory

SYNOPSIS         top

       #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)):

           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:

DESCRIPTION         top

       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         top

       The opendir() and fdopendir() functions return a pointer to the
       directory stream.  On error, NULL is returned, and errno is set

ERRORS         top

       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.

              name is not a directory.

VERSIONS         top

       fdopendir() is available in glibc since version 2.4.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface              Attribute     Value   │
       │opendir(), fdopendir() │ Thread safety │ MT-Safe │

CONFORMING TO         top

       opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
       fdopendir() is specified in POSIX.1-2008.

NOTES         top

       Filename entries can be read from a directory stream using

       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,

SEE ALSO         top

       open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
       seekdir(3), telldir(3)

COLOPHON         top

       This page is part of release 5.09 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

GNU                              2017-09-15                       OPENDIR(3)

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