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Annotation of coherent/b/kernel/io.386/ipc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Inter-Process Communication common access routine.
        !             3:  *
        !             4:  * $Log:       ipc.c,v $
        !             5:  * Revision 1.3  93/04/14  10:11:48  root
        !             6:  * r75
        !             7:  * 
        !             8:  * Revision 1.1        88/03/24  17:05:02      src
        !             9:  * Initial revision
        !            10:  * 
        !            11:  */
        !            12: #include <sys/coherent.h>
        !            13: #include <sys/ipc.h>
        !            14: 
        !            15: /*
        !            16:  * Determine Inter-Process Communication Access Permissions.
        !            17:  *
        !            18:  *     Input:  p = pointer to inter-process communication permission struct.
        !            19:  *
        !            20:  *     Action: If super user, permissions are 0600.
        !            21:  *             If uid is that of the creator or owner of the message id,
        !            22:  *                     use user permissions.
        !            23:  *             If gid is that of the creator or owner of the message id,
        !            24:  *                     use group permissions.
        !            25:  *             Otherwise, use others permissions.
        !            26:  *
        !            27:  *     Output: 0600 = Read/Alter permission.
        !            28:  *             0400 = Read permission.
        !            29:  *             0200 = Alter permission.
        !            30:  *                0 = No permission.
        !            31:  */
        !            32: int
        !            33: ipcaccess(p)
        !            34: register struct ipc_perm * p;
        !            35: {
        !            36:        if (u.u_uid == 0)
        !            37:                return 0600;
        !            38: 
        !            39:        if ((u.u_uid == p->uid) || (u.u_uid == p->cuid))
        !            40:                return p->mode & 0600;
        !            41: 
        !            42:        if ((u.u_gid == p->gid) || (u.u_gid == p->cgid))
        !            43:                return (p->mode << 3) & 0600;
        !            44: 
        !            45:        return (p->mode << 6) & 0600;
        !            46: }

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