Libc-262.tar.gz

[apple/libc.git] / gen.subproj / ftok.3

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-.\"    $OpenBSD: ftok.3,v 1.8 1999/07/07 10:55:36 aaron Exp $
-.\"
-.\" Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd June 24, 1994
-.Dt FTOK 3
-.Os
-.Sh NAME
-.Nm ftok
-.Nd create IPC indentifier from a pathname
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/ipc.h>
-.Ft key_t
-.Fn ftok "const char *path" "int id" ;
-.Sh DESCRIPTION
-The
-.Fn ftok
-function attempts to create a unique key suitable for use with the
-.Xr msgget 2 ,
-.Xr semget 2
-and
-.Xr shmget 2
-functions given the
-.Fa path
-of an existing file and a user-selectable
-.Fa id .
-.Pp
-The specified
-.Fa path
-must refer to an existing file that is accessible to the calling process
-or the call will fail.  Also, note that links to files will return the
-same key, given the same
-.Fa id .
-Only the 8 least significant bits of
-.Fa id
-are used in the key generation; the rest of the bits are ignored.
-.Sh RETURN VALUES
-The
-.Fn ftok
-function will return (key_t)\-1 if
-.Fa path
-does not exist or if it cannot be accessed by the calling process.
-.Sh SEE ALSO
-.Xr msgget 2 ,
-.Xr semget 2 ,
-.Xr shmget 2
-.Sh HISTORY
-The
-.Fn ftok
-function originated with System V and is typically used by programs
-that use the System V IPC routines.
-.Sh AUTHOR
-Thorsten Lockert <tholo@sigmasoft.com>
-.Sh BUGS
-The returned key is computed based on the device and inode of the
-specified
-.Fa path
-in combination with the given
-.Fa id .
-Thus it is quite possible for the routine to return duplicate keys
-given that those fields are not 8- and 16-bit quantities like they
-were on System V based systems where this library routine's ancestors
-were originally created.