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Annotation of coherent/d/286_KERNEL/USRSRC/io/ipc.c, revision 1.1

1.1     ! root        1: /* $Header: /usr/src/sys/i8086/drv/RCS/ipc.c,v 2.1 88/09/03 13:06:15 src Exp $
        !             2:  *
        !             3:  *     The  information  contained herein  is a trade secret  of INETCO
        !             4:  *     Systems, and is confidential information.   It is provided under
        !             5:  *     a license agreement,  and may be copied or disclosed  only under
        !             6:  *     the terms of that agreement.   Any reproduction or disclosure of
        !             7:  *     this  material  without  the express  written  authorization  of
        !             8:  *     INETCO Systems or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     Copyright (c) 1985
        !            11:  *     An unpublished work by INETCO Systems, Ltd.
        !            12:  *     All rights reserved.
        !            13:  */
        !            14: 
        !            15: /*
        !            16:  * Inter-Process Communication.
        !            17:  *
        !            18:  * $Log:       /usr/src/sys/i8086/drv/RCS/ipc.c,v $
        !            19:  * Revision 2.1        88/09/03  13:06:15      src
        !            20:  * *** empty log message ***
        !            21:  * 
        !            22:  * Revision 1.1        88/03/24  17:05:02      src
        !            23:  * Initial revision
        !            24:  * 
        !            25:  */
        !            26: #include <coherent.h>
        !            27: #include <sys/ipc.h>
        !            28: #include <sys/uproc.h>
        !            29: 
        !            30: /*
        !            31:  * Determine Inter-Process Communication Access Permissions.
        !            32:  *
        !            33:  *     Input:  p = pointer to inter-process communication permission struct.
        !            34:  *
        !            35:  *     Action: If super user, permissions are 0600.
        !            36:  *             If uid is that of the creator or owner of the message id,
        !            37:  *                     use user permissions.
        !            38:  *             If gid is that of the creator or owner of the message id,
        !            39:  *                     use group permissions.
        !            40:  *             Otherwise, use others permissions.
        !            41:  *
        !            42:  *     Output: 0600 = Read/Alter permission.
        !            43:  *             0400 = Read permission.
        !            44:  *             0200 = Alter permission.
        !            45:  *                0 = No permission.
        !            46:  */
        !            47: 
        !            48: ipcaccess( p )
        !            49: 
        !            50: register struct ipc_perm * p;
        !            51: 
        !            52: {
        !            53:        if ( u.u_uid == 0 )
        !            54:                return 0600;
        !            55: 
        !            56:        if ((u.u_uid == p->uid) || (u.u_uid == p->cuid))
        !            57:                return p->mode & 0600;
        !            58: 
        !            59:        if ((u.u_gid == p->gid) || (u.u_gid == p->cgid))
        !            60:                return (p->mode << 3) & 0600;
        !            61: 
        !            62:        return (p->mode << 6) & 0600;
        !            63: }

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