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opendir(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|STANDARDS \|STANDARDS \|NOTES \|SEE ALSO \|COLOPHON

opendir(3)               Library Functions Manualopendir(3)

NAME top

       opendir, fdopendir - open a directory

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <sys/types.h>#include <dirent.h>DIR *opendir(const char *name);DIR *fdopendir(intfd);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):fdopendir():           Since glibc 2.10:               _POSIX_C_SOURCE >= 200809L           Before glibc 2.10:               _GNU_SOURCE

DESCRIPTION top

       Theopendir() function opens a directory stream corresponding to       the directoryname, and returns a pointer to the directory stream.       The stream is positioned at the first entry in the directory.       Thefdopendir() function is likeopendir(), but returns a       directory stream for the directory referred to by the open file       descriptorfd.  After a successful call tofdopendir(),fd is used       internally by the implementation, and should not otherwise be used       by the application.

RETURN VALUE top

       Theopendir() andfdopendir() functions return a pointer to the       directory stream.  On error, NULL is returned, anderrno is set to       indicate the error.

ERRORS top

EACCESPermission denied.EBADFfd is not a valid file descriptor opened for reading.EMFILEThe per-process limit on the number of open file              descriptors has been reached.ENFILEThe system-wide limit on the total number of open files has              been reached.ENOENTDirectory does not exist, orname is an empty string.ENOMEMInsufficient memory to complete the operation.ENOTDIRname is not a directory.

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │opendir(),fdopendir()               │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       POSIX.1-2008.

STANDARDS top

opendir()              SVr4, 4.3BSD, POSIX.1-2001.fdopendir()              POSIX.1-2008.  glibc 2.4.

NOTES top

       Filename entries can be read from a directory stream usingreaddir(3).       The underlying file descriptor of the directory stream can be       obtained usingdirfd(3).       Theopendir() function sets the close-on-exec flag for the file       descriptor underlying theDIR *.  Thefdopendir() 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 tofdopendir() will set the close-on-exec flag for       the file descriptor,fd.

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17opendir(3)

Pages that refer to this page:close_range(2), execve(2), fanotify_mark(2), fork(2), open(2), closedir(3), dirfd(3), fts(3), getdirentries(3), glob(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)