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FreeBSD 11.0 - man page for rmdir (freebsd section 2)

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

rmdir -- remove a directory file
Standard C Library (libc, -lc)
#include <unistd.h> int rmdir(const char *path);
The rmdir() system call removes a directory file whose name is given by path. The directory must not have any entries other than '.' and '..'.
The rmdir() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
The named file is removed unless: [ENOTDIR] A component of the path is not a directory. [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. [ENOENT] The named directory does not exist. [ELOOP] Too many symbolic links were encountered in translating the pathname. [ENOTEMPTY] The named directory contains files other than '.' and '..' in it. [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. [EPERM] The directory to be removed has its immutable, undeletable or append-only flag set, see the chflags(2) manual page for more information. [EPERM] The parent directory of the directory to be removed has its immutable or append-only flag set. [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. [EINVAL] The last component of the path is '.' or '..'. [EBUSY] The directory to be removed is the mount point for a mounted file system. [EIO] An I/O error occurred while deleting the directory entry or deallocating the inode. [EROFS] The directory entry to be removed resides on a read-only file system. [EFAULT] The path argument points outside the process's allocated address space.
mkdir(2), unlink(2)
The rmdir() system call appeared in 4.2BSD.
December 9, 2006 BSD