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REVOKE(2)		      System Calls Manual		     REVOKE(2)

NAME
       revoke -- revoke	file access

LIBRARY
       Standard	C Library (libc, -lc)

SYNOPSIS
       #include	<unistd.h>

       int
       revoke(const char *path);

DESCRIPTION
       The  revoke() system call invalidates all current open file descriptors
       in the system for the file named	by path.  Subsequent operations	on any
       such descriptors	fail, with the exceptions that a read()	from a charac-
       ter device file which has been revoked returns a	count of zero (end  of
       file),  and  a close() system call will succeed.	 If the	file is	a spe-
       cial file for a device which is open,  the  device  close  function  is
       called  as  if  all open	references to the file had been	closed using a
       special close method which does not block.

       Access to a file	may be revoked only by its owner or  the  super	 user.
       The  revoke()  system  call  is	currently supported only for block and
       character special device	files.	It is normally used to prepare a  ter-
       minal device for	a new login session, preventing	any access by a	previ-
       ous user	of the terminal.

RETURN VALUES
       The  revoke() function returns the value	0 if successful; otherwise the
       value -1	is returned and	the global variable errno is set  to  indicate
       the error.

ERRORS
       Access to the named file	is revoked unless one of the following:

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

       [ENAMETOOLONG]	  A  component	of a pathname exceeded 255 characters,
			  or an	entire path name exceeded 1024 characters.

       [ENOENT]		  The named file or a component	of the path name  does
			  not exist.

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

       [ELOOP]		  Too many symbolic links were encountered  in	trans-
			  lating the pathname.

       [EFAULT]		  The path argument points outside the process's allo-
			  cated	address	space.

       [EINVAL]		  The implementation does not support the revoke() op-
			  eration on the named file.

       [EPERM]		  The  caller is neither the owner of the file nor the
			  super	user.

SEE ALSO
       revoke(1), close(2)

HISTORY
       The revoke() system call	first appeared in 4.3BSD-Reno.

BUGS
       The non-blocking	close method is	only correctly implemented for	termi-
       nal devices.

FreeBSD	13.2		       January 25, 2016			     REVOKE(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY | BUGS

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