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 suc- cessful call to fdopendir(), fd is used internally by the implementa- tion, and should not otherwise be used by the application.
RETURN VALUE The opendir() and fdopendir() functions return a pointer to the direc- tory 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 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 information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
GNU 2008-08-06 OPENDIR(3)