MKDIR(2)
NAME
mkdir − make a directory file
USAGE
mkdir(path, mode) char *path; int mode;
DESCRIPTION
Mkdir creates a new directory file with the name path. Mode sets the new directory’s 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).
NOTES
The DOMAIN System’s single level store architecture requires that all filesystem objects be readable in order to be writable or executable. Since write-only or execute-only files would be unusable in DOMAIN/IX, modes that specify 02 (write-only) or 01 (execute-only) are ORed with 0400 to force read permission. This applies to the owner, group, and world portions of the mode word. For example, if mode 0631 were specified, the mode applied to the file would actually be 0675.
RETURN VALUE
A successful call returns zero. A failed call returns -1 and sets errno as indicated below.
ERRORS
Mkdir will fail and no directory will be created if:
[EPERM] The path argument contains a byte with the high-order bit set.
[ENOTDIR] A component of the path prefix is not a directory.
[ENOENT] A component of the path prefix does not exist.
[EROFS] The named file resides on a read-only file system.
[EEXIST] The named file already exists.
[EFAULT] Path points outside the process’s allocated address space.
[ELOOP] The call encountered too many symbolic links in translating the pathname.
[EIO] An I/O error occurred while the call was writing to the file system.