MKNOD(S)                 XENIX System V                  MKNOD(S)



     Name
          mknod - Makes a directory, or a special or ordinary file.

     Syntax
          int mknod (path, mode, dev)
          char *path;
          int mode, dev;

     Description
          mknod creates a new file named by the pathname 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 Named pipe special
                    0020000 Character special
                    0040000 Directory
                    0050000 Name special file
                    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

          Values of mode other than those above are undefined and
          should not be used.

          The file's owner ID is set to the process' effective user
          ID.  The file's group ID is set to the process' effective
          group ID.

          The low-order 9 bits of mode are modified by the process'
          file mode creation mask: all bits set in the process' file
          mode creation mask are cleared.  See umask(S).  If mode
          indicates a block, character, or name special file, then dev
          is a configuration-dependent specification of a character or
          block I/O device.  If mode does not indicate a block,
          character, or name special file, then dev is ignored.  For
          block and character special files, dev is the special file's
          device number.  For name special files, dev is the type of
          the name file, either a shared memory file or a semaphore.



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     MKNOD(S)                 XENIX System V                  MKNOD(S)



          mknod may be invoked only by the super-user for file types
          other than named pipe-special files.

          mknod will fail and the new file will not be created if one
          or more of the following are true:

               The process' effective user ID is not super-user.
               [EPERM]

               A component of the path prefix is not a directory.
               [ENOTDIR]

               A component of the path prefix does not exist.
               [ENOENT]

               A component of the path prefix denies search
               permission.  [EACCES]

               The directory in which the file is to be created is
               located on a read-only file system.  [EROFS]

               The named file exists.  [EEXIST]

               path points outside the process' allocated address
               space.  [EFAULT]

               The directory to contain the new file cannot be
               extended.  [ENOSPC]

     Return Value
          Upon successful completion a value of 0 is returned.
          Otherwise, a value of -1 is returned and errno is set to
          indicate the error.

     See Also
          chmod(S), creatsem(S), exec(S), filesystem(F), mkdir(C),
          mknod(C), sdget(S), umask(S),

     Notes
          Semaphore files should be created with the creatsem(S)
          system call.

          Share data files should be created with the sdget(S) system
          call.











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