AT&T UNIX™PC Unix System V Users Manual - tenox

MKNOD (2) MKNOD (2)
NAME
mknod - make a directory, or a special or ordinary file
SYNOPSIS
int mknod (path, mode, dev)
char *path;
int mode, dev;
DESCRIPTION
Mknod creates a new file named by the path name pointed to by
path . The mode of the new file is initialized from mode, where
the value of mode is interpreted as follows:
0170000 file type; one of the following:
0010000 fifo special
0020000 character special
0040000 directory
0060000 block special
0100000 or 0000000 ordinary file
0004000 set user ID on execution
0002000 set group ID on execution
0001000 save text image after execution
0000777 access permissions; constructed from the following
0000400 read by owner
0000200 write by owner
0000100 execute (search on directory) by owner
0000070 read, write, execute (search) by group
0000007 read, write, execute (search) by others
The file's owner ID is set to the process's effective user ID. The
file's group ID is set to the process's effective group ID.
'
Values of mode other than those above are undefined and should
not be used. 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). If mode indicates
a block or character special file, dev is a configuration dependent
specification of a character or block I/0 device. If mode does not
indicate a block special or character special device, dev is ignored.
Mknod may be invoked only by the super-user for file types other
than FIFO special.
Mknod will fail and the new file will not be created if one or more
of the following are true:
The process's effective user ID is not super-user. [EPERMI
A component of the path prefix is not a directory.
[ENOTDffij
A component of the path prefix does not exist. [ENOENTI
The directory in which the file is to be created is located
on a read-only file system. [EROFSj
The named file exists. [EEXISTI
Path points outside the process's allocated address space.
[EFAULTj
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