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Standard C Library Functionsopendir(3C)


NAME

 opendir, fdopendir - open directory

SYNOPSIS

 
#include <sys/types.h>
#include <dirent.h>
DIR *opendir(const char *dirname);
 DIR *fdopendir(int fildes);

DESCRIPTION

 

The opendir() function opens a directory stream corresponding to the directory named by the dirname argument.

The fdopendir() function opens a directory stream for the directory file descriptor fildes. The directory file discriptor should not be used or closed following a successful function call, as this might cause undefined results from future operations on the directory stream obtained from the call. Use closedir(3C) to close a directory stream.

The directory stream is positioned at the first entry. If the type DIR is implemented using a file descriptor, applications will only be able to open up to a total of {OPEN_MAX} files and directories. A successful call to any of the exec functions will close any directory streams that are open in the calling process. See exec(2).

RETURN VALUES

 

Upon successful completion, opendir() and fdopendir() return a pointer to an object of type DIR. Otherwise, a null pointer is returned and errno is set to indicate the error.

ERRORS

 

The opendir() function will fail if:

EACCES
Search permission is denied for the component of the path prefix of dirname or read permission is denied for dirname.
ELOOP
Too many symbolic links were encountered in resolving path.
ENAMETOOLONG
The length of the dirname argument exceeds {PATH_MAX}, or a path name component is longer than {NAME_MAX} while {_POSIX_NO_TRUNC} is in effect.
ENOENT
A component of dirname does not name an existing directory or dirname is an empty string.
ENOTDIR
A component of dirname is not a directory.

The fdopendir() function will fail if:

ENOTDIR
The file descriptor fildes does not reference a directory.

The opendir() function may fail if:

EMFILE
There are {OPEN_MAX} file descriptors currently open in the calling process.
ENAMETOOLONG
Pathname resolution of a symbolic link produced an intermediate result whose length exceeds PATH_MAX.
ENFILE
Too many files are currently open on the system.

USAGE

 

The opendir() and fdopendir() functions should be used in conjunction with readdir(3C), closedir(3C) and rewinddir(3C) to examine the contents of the directory (see the EXAMPLES section in readdir(3C)). This method is recommended for portability.

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface Stabilityopendir is Standard; fdopendir is Evolving
MT-LevelSafe

SEE ALSO

 

lstat(2), symlink(2), closedir(3C), readdir(3C), rewinddir(3C), attributes(5)


SunOS 5.9Go To TopLast Changed 1 Aug 2001

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.