| ftok.3 (14054) | ftok.3 (16091) |
|---|---|
| 1.\" Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 9 unchanged lines hidden (view full) --- 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 19.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 21.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 23.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 24.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" | 1.\" Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 9 unchanged lines hidden (view full) --- 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 19.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 21.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 23.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 24.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" |
| 26.\" $Id: ftok.3,v 1.2 1996/01/30 18:12:32 mpp Exp $ | 26.\" $Id: ftok.3,v 1.3 1996/02/12 07:06:23 mpp Exp $ |
| 27.Dd June 24, 1994 28.Os 29.Dt ftok 3 30.Sh NAME 31.Nm ftok 32.Nd create IPC identifier from path name 33.Sh SYNOPSIS 34.Fd #include <sys/types.h> 35.Fd #include <sys/ipc.h> 36.Ft key_t | 27.Dd June 24, 1994 28.Os 29.Dt ftok 3 30.Sh NAME 31.Nm ftok 32.Nd create IPC identifier from path name 33.Sh SYNOPSIS 34.Fd #include <sys/types.h> 35.Fd #include <sys/ipc.h> 36.Ft key_t |
| 37.Fn ftok "const char *path" "char id" ; | 37.Fn ftok "const char *path" "int id" ; |
| 38.Sh DESCRIPTION 39.Bf -symbolic 40This function is available from the compatibility library, libcompat. 41.Ef 42The 43.Fn ftok 44function attempts to create a unique key suitable for use with the 45.Xr msgget 3 , --- 19 unchanged lines hidden (view full) --- 65does not exist or if it cannot be accessed by the calling process. 66.Sh SEE ALSO 67.Xr semget 2 , 68.Xr shmget 2 , 69.Xr msgget 3 70.Sh HISTORY 71The 72.Fn ftok | 38.Sh DESCRIPTION 39.Bf -symbolic 40This function is available from the compatibility library, libcompat. 41.Ef 42The 43.Fn ftok 44function attempts to create a unique key suitable for use with the 45.Xr msgget 3 , --- 19 unchanged lines hidden (view full) --- 65does not exist or if it cannot be accessed by the calling process. 66.Sh SEE ALSO 67.Xr semget 2 , 68.Xr shmget 2 , 69.Xr msgget 3 70.Sh HISTORY 71The 72.Fn ftok |
| 73function originate with System V and is typically used by programs | 73function originates with System V and is typically used by programs |
| 74that use the System V IPC routines. 75.Sh AUTHOR 76.Bl -tag 77Thorsten Lockert <tholo@sigmasoft.com> 78.El 79.Sh BUGS | 74that use the System V IPC routines. 75.Sh AUTHOR 76.Bl -tag 77Thorsten Lockert <tholo@sigmasoft.com> 78.El 79.Sh BUGS |
| 80The returned key is computed based on the device and inode of the | 80The returned key is computed based on the device minor number and inode of the |
| 81specified 82.Fa path | 81specified 82.Fa path |
| 83in combination with the given | 83in combination with the lower 8 bits of the given |
| 84.Fa id . | 84.Fa id . |
| 85Thus is is quite possible for the routine to return duplicate keys 86given that those fields are not 8- and 16-bit quantities like they 87were on System V based systems where this library routine's ancestor 88were originally created. | 85Thus is is quite possible for the routine to return duplicate keys. |