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OSX 10.6.2 - man page for rmdir (osx section 2)

RMDIR(2)						      BSD System Calls Manual							  RMDIR(2)

rmdir -- remove a directory file
#include <unistd.h> int rmdir(const char *path);
Rmdir() removes a directory file whose name is given by path. The directory must not have any entries other than '.' and '..'.
A 0 is returned if the remove succeeds; otherwise a -1 is returned and an error code is stored in the global location errno.
The named file is removed unless: [EACCES] Search permission is denied for a component of the path prefix. [EACCES] Write permission is denied on the directory containing the link to be removed. [EBUSY] The directory to be removed is the mount point for a mounted file system. [EFAULT] Path points outside the process's allocated address space. [EIO] An I/O error occurs while deleting the directory entry or deallocating the inode. [ELOOP] Too many symbolic links are encountered in translating the pathname. This is taken to be indicative of a looping symbolic link. [ENAMETOOLONG] A component of a pathname (possibly expanded by a symbolic link) exceeds {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters. [ENOENT] The named directory does not exist. [ENOTDIR] A component of the path is not a directory. [ENOTEMPTY] The named directory contains files other than '.' and '..' in it. [EPERM] The directory containing the directory to be removed is marked sticky, and neither the containing directory nor the direc- tory to be removed are owned by the effective user ID. [EROFS] The directory entry to be removed resides on a read-only file system.
mkdir(2), unlink(2)
The rmdir() function call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution