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opendir, fdopendir — open a directory
#include <sys/types.h> #include <dirent.h>
DIR
*opendir( |
const char *name) ; |
DIR
*fdopendir( |
int fd) ; |
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Note | |||||
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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.
The opendir
() and
fdopendir
() functions return a
pointer to the directory stream. On error, NULL is returned,
and errno
is set
appropriately.
Permission denied.
fd
is not a
valid file descriptor opened for reading.
Too many file descriptors in use by process.
Too many files are currently open in the system.
Directory does not exist, or name
is an empty
string.
Insufficient memory to complete the operation.
name
is not
a directory.
opendir
() is present on
SVr4, 4.3BSD, and specified in POSIX.1-2001. fdopendir
() is specified in
POSIX.1-2008.
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
.
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)