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mknod(2)							     mknod(2)



NAME
  mknod	- Creates an FIFO or special file

LIBRARY

  Standard C Library (libc.a)

SYNOPSIS

  #include <&lt;sys/stat.h>&gt;

  int mknod (
	  const	char *path,
	  int mode,
	  dev_t	device );

STANDARDS

  Interfaces documented	on this	reference page conform to industry standards
  as follows:

  mknod():  POSIX.1, XPG4-UNIX

  Refer	to the standards(5) reference page for more information	about indus-
  try standards	and associated tags.

  Standards: standards(5)

PARAMETERS

  path	    Names the new file.	 If the	final component	of the path parameter
	    names a symbolic link, the link will be traversed and pathname
	    resolution will continue.

  mode	    Specifies the file type, attributes, and access permissions. This
	    parameter is constructed by	logically ORing	values described in
	    the	sys/mode.h header file.

  device    Depends upon the configuration and is used only if the mode
	    parameter specifies	a block	or character special file.  If the
	    file you specify is	a remote file, the value of the	device param-
	    eter must be meaningful on the node	where the file resides.

DESCRIPTION

  The mknod() function creates a special file or FIFO.	Using the mknod()
  function to create file types	other than FIFO	special	requires superuser
  privilege.

  For the mknod() function to complete successfully, a process must have
  search permission and	write permission in the	parent directory of the	path
  parameter.

  The new file has the following characteristics:

    +  File type as specified by the mode parameter.

    +  Owner ID	set to the process effective user ID.

    +  Group ID	set to the group ID of its parent directory.

    +  Permission and attribute	bits set according to the value	of the mode
       parameter. All bits set in the process file mode	creation mask are
       cleared.	 See the umask() function.

RETURN VALUES

  Upon successful completion of	the mknod() function a value of	0 (zero) is
  returned.  Otherwise,	a value	of -1 is returned and errno is set to indi-
  cate the error.

ERRORS

  If the mknod() function fails, the new file is not created and errno may be
  set to one of	the following values:

  [EACCES]  A component	of the path prefix denies search permission, or	write
	    permission is denied on the	parent directory of the	FIFO to	be
	    created.

  [EDQUOT]  The	directory in which the entry for the new link is being placed
	    cannot be extended because the user's quota	of disk	blocks or
	    inodes on the file system is exhausted.

  [EEXIST]  The	named file exists.

  [EIO]	    While accessing the	file system, an	I/O error occurred.

  [EINVAL]  An invalid argument	has been specified.

  [ENAMETOOLONG]
	    The	length of the path parameter exceeds PATH_MAX or a pathname
	    component is longer	than NAME_MAX.

  [ENOENT]  A component	of the path prefix does	not exist or the path parame-
	    ter	points to an empty string.

  [ENOSPC]  The	directory that would contain the new file cannot be extended
	    or the file	system is out of file allocation resources.

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

  [EPERM]   The	mode parameter specifies a file	type other than	FIFO and the
	    calling process does not have the sufficient privilege.

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

RELATED	INFORMATION

  Functions: chmod(2), mkdir(2), open(2), umask(2), stat(2)

  Commands: chmod(1), mkdir(1)

  Standards: standards(5)