NAME

mkdir − make a directory file

SYNOPSIS

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

DESCRIPTION

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).

RETURN VALUE

A 0 return value indicates success.  A −1 return value indicates an error, and an error code is stored in errno. 

ERRORS

Mkdir will fail and no directory will be created if:

[EPERM] The process’s effective user ID is not super-user. 

[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 exists. 

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

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

[EIO] An I/O error occurred while reading from or writing to the file system. 

[ENOENT] The path name is too long. 

[EACCES] A component of the path prefix denies search permission. 

[ENOSPC] The directory in which the entry for the new file is being placed cannot be extended because there is no space left on the file system containing the directory. 

[ENOSPC] The new directory cannot be created because there is no space left on the file system which will contain the directory. 

[ENOSPC] There are no free inodes on the file system on which the directory is being created. 

SEE ALSO

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

4BSD