mkdir(2) System Calls Manual mkdir(2)
Name
mkdir - make a directory file
Syntax
#include <sys/types.h>
#include <sys/stat.h>
mkdir(path, mode)
char *path;
mode_t mode;
Description
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, see
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
Return Values
A 0 return value indicates success. A -1 return value indicates an error, and an error code is stored in errno.
Diagnostics
The system call fails and a directory is not created if the following occurs:
[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.
[ENAMETOOLONG]
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 directory 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 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.
[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 directory.
[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 been
revoked.
[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 {LINK_MAX}.
See Also
chmod(2), stat(2), umask(2)
mkdir(2)
