Copyright (c) 1983 Regents of the University of California.
All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.

@(#)mkdir.2 6.3 (Berkeley) 08/07/85

C 5 mkdir - make a directory file

mkdir(path, mode)
char *path;
int mode;

Mkdir creates a new directory file with name path . The mode of the new file is initialized from mode . (The protection part of the mode is modified by the process's mode mask; see umask (2)).

The directory's owner ID is set to the process's effective user ID. The directory's group ID is set to that of the parent directory in which it is created.

The low-order 9 bits of mode are modified by the process's file mode creation mask: all bits set in the process's file mode creation mask are cleared. See umask (2).

A 0 return value indicates success. A -1 return value indicates an error, and an error code is stored in errno. Mkdir will fail and no directory will be created if:

15 [ENOTDIR] A component of the path prefix is not a directory.

15 [EINVAL] The pathname contains a character with the high-order bit set.

15 [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

15 [ENOENT] A component of the path prefix does not exist.

15 [EACCES] Search permission is denied for a component of the path prefix.

15 [ELOOP] Too many symbolic links were encountered in translating the pathname.

15 [EPERM] The path argument contains a byte with the high-order bit set.

15 [EROFS] The named file resides on a read-only file system.

15 [EEXIST] The named file exists.

15 [EIO] An I/O error occurred while making the directory entry or allocating the inode.

15 [EFAULT] Path points outside the process's allocated address space.

15 [EIO] An I/O error occured while writing to the file system.

chmod(2), stat(2), umask(2)