mknod man page on Ultrix

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mknod(2)							      mknod(2)

Name
       mknod - make a directory or a special file

Syntax
       #include <sys/types.h>
       #include <sys/stat.h>

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

Description
       The system call creates a new file whose name is path.  The mode of the
       new file (including special file bits) is initialized from mode,	 where
       the value of mode is interpreted as follows:

       S_IFMT-0170000  File type; one of the following:
	      S_IFIFO-0010000  FIFO special
	      S_IFCHR-0020000  Character special
	      S_IFDIR-0040000  Directory
	      S_IFBLK-0060000  Block special
	      S_IFREG-0100000
		   or 0000000  Ordinary file

       S_IRWXU-0007000 Execution mode; made from the following:
	      S_ISUID-0004000  Set user ID on execution
	      S_ISGID-0002000  Set group ID on execution
	      S_ISVTX-0001000  Save text image after execution

	       00777   Access permissions; made from the following:
	      S_IREAD-0000400  Read by owner
	      S_IWRITE-0000200 Write by owner
	      S_IEXEC-0000100  Execute (search on directory) by owner
	      s_IRWXG-0000070  Read, write, execute (search) by group
	      S_IRWXD-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 parent directory's	 group ID.

       Values of mode other than those in the preceeding  list	are  undefined
       and  should  not be used.  The low-order nine 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 If
       mode indicates a block or character special file, dev is	 a  configura‐
       tion  dependent	specification  of a character or block I/O device.  If
       mode does not indicate a block special or character special device, dev
       is ignored.

       For  file  types other than FIFO special, only the superuser can invoke
       the system call.

Return Values
       The system call returns a value of 0 upon successful completion.	  Oth‐
       erwise, returns a value of -1, and sets errno to indicate the error.

Diagnostics
       The  system call fails and the file mode is unchanged under the follow‐
       ing conditions:

       [EPERM]	      The process's effective user ID is not superuser.

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

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

       [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.

       [ELOOP]	      Too  many symbolic links were encountered in translating
		      the pathname.

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an
		      entire pathname exceeded 1023 characters.

       [EACCES]	      Search  permission is denied for a component of the path
		      prefix.

       [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.

       [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	direc‐
		      tory has been exhausted.

       [EDQUOT]	      The  user's  quota of inodes on the file system on which
		      the node 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 communi‐
		      cations protocol.

See Also
       mkdir(1), chmod(2), execve(2), stat(2), umask(2), fs(5)

								      mknod(2)
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