mkdir(2)mkdir(2)Namemkdir - make a directory file
The system call 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. For further information,
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. For further information, see
A 0 return value indicates success. A -1 return value indicates an
error, and an error code is stored in errno.
The system call fails and a directory is not created if the following
[EISDIR] The named file is a directory, and the arguments specify it
is to be opened for writing.
[ENOTDIR] A component of the path prefix is not a directory.
A component of a pathname exceeded 255 characters, or an
entire pathname exceeded 1023 characters.
[ENOENT] A component of the path prefix does not exist or the path
argument points to an empty string and the environment
defined is POSIX or SYSTEM_FIVE.
[EACCES] Search permission is denied for a component of the path
prefix, or write permission is denied on the parent direc‐
tory to be created.
[EROFS] The named file resides on a read-only file system.
[EEXIST] The named file exists.
[EFAULT] The path points outside the process's allocated address
[ELOOP] Too many symbolic links were encountered in translating the
[EIO] An I/O error occurred while reading from or writing to the
[EIO] An I/O error occurred while making the directory entry or
allocating the inode.
[ENOSPC] The directory in which the entry for the new directory 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 that will contain the direc‐
[ENOSPC] There are no free inodes on the file system on which the
directory is being created.
[EDQUOT] The directory in which the entry for the new directory is
being placed cannot be extended, because the user's quota
of disk blocks on the file system containing the directory
has been exhausted.
[EDQUOT] The new directory cannot be created, because the user's
quota of disk blocks on the file system that will contain
the directory has been exhausted.
[EDQUOT] The user's quota of inodes on the file system on which the
directory is being created has been exhausted.
[ESTALE] The file handle given in the argument is invalid. The file
referred to by that file handle no longer exists or has
[ETIMEDOUT] A "connect" request or remote file operation failed because
the connected party did not properly respond after a period
of time that is dependent on the communications protocol.
[EMLINK] The link count of the parent directory would exceed
See Alsochmod(2), stat(2), umask(2)mkdir(2)