NAME

mkdir − make a directory file

SYNOPSIS

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

REMARKS

Not all systems implement this as a system call; some use a library call to the mkdir(1) command to achieve the same effect.  The errors documented below will appear in any case, and no error messages will ever be printed.

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 the process’s effective group ID. 

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:

­[ENOSPC] Not enough space on the file system. 

[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.  The reliable detection of this error will be implementation dependent. 

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

[ENAMETOOLONG] The path specified exceeds MAXPATHLEN characters. 

AUTHOR

Mkdir was developed by the University of California, Berkeley California, Computer Science Division, Department of Electrical Engineering and Computer Science. 

SEE ALSO

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

Hewlett-Packard Company  —  Version B.1,  May 11, 2021