MKNOD(2) BSD Programmer's Manual MKNOD(2)
mknod - make a special file node
mknod(const char *path, mode_t mode, dev_t dev);
The device special file path is created with the major and minor device
numbers extracted from mode. The access permissions of path are descen-
dant from the umask(2) of the parent process.
If mode indicates a block or character special file, dev is a configura-
tion dependent specification of a character or block I/O device and the
superblock of the device. If mode does not indicate a block special or
character special device, dev is ignored.
Mknod() requires super-user privileges.
Upon successful completion a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
Mknod() will fail and the file will be not created if:
[ENOTDIR] A component of the path prefix is not a directory.
[EINVAL] The pathname contains a character with the high-order bit
A component of a pathname exceeded 255 characters, or an
entire path name exceeded 1023 characters.
[ENOENT] A component of the path prefix does not exist.
[EACCES] Search permission is denied for a component of the path
[ELOOP] Too many symbolic links were encountered in translating the
[EPERM] The process's effective user ID is not super-user.
[EPERM] The pathname contains a character with the high-order bit
[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 node is being
placed cannot be extended because there is no space left on
the file system containing the directory.
[ENOSPC] There are no free inodes on the file system on which the
node is being created.
[EDQUOT] The directory in which the entry for the new node is being
placed cannot be extended because the user's quota of disk
blocks on the file system containing the directory has been
[EDQUOT] The user's quota of inodes on the file system on which the
node is being created has been exhausted.
[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.
chmod(2), stat(2), umask(2)
A mknod function call appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution June 4, 1993 2