mkdir - create a directory
int mkdir(const char *pathname, mode_t mode);
() attempts to create a directory named pathname
The argument mode
specifies the permissions to use. It is modified by the
in the usual way: the permissions of the created
directory are (mode
& 0777). Other mode bits of
the created directory depend on the operating system. For Linux, see below.
The newly created directory will be owned by the effective user ID of the
process. If the directory containing the file has the set-group-ID bit set, or
if the file system is mounted with BSD group semantics (mount -o
or, synonymously mount -o grpid
), the new directory will
inherit the group ownership from its parent; otherwise it will be owned by the
effective group ID of the process.
If the parent directory has the set-group-ID bit set then so will the newly
() returns zero on success, or -1 if an error occurred (in which
is set appropriately).
- The parent directory does not allow write permission to the
process, or one of the directories in pathname did not allow search
permission. (See also path_resolution(7).)
- pathname already exists (not necessarily as a
directory). This includes the case where pathname is a symbolic
link, dangling or not.
- pathname points outside your accessible address
- Too many symbolic links were encountered in resolving
- The number of links to the parent directory would exceed
- pathname was too long.
- A directory component in pathname does not exist or
is a dangling symbolic link.
- Insufficient kernel memory was available.
- The device containing pathname has no room for the
- The new directory cannot be created because the user's disk
quota is exhausted.
- A component used as a directory in pathname is not,
in fact, a directory.
- The file system containing pathname does not support
the creation of directories.
- pathname refers to a file on a read-only file
SVr4, BSD, POSIX.1-2001.
Under Linux apart from the permission bits, only the S_ISVTX
mode bit is
honored. That is, under Linux the created directory actually gets mode
& 01777). See also stat(2)
There are many infelicities in the protocol underlying NFS. Some of these affect
This page is part of release 3.44 of the Linux man-pages
description of the project, and information about reporting bugs, can be found