FreeBSD/Linux Kernel Cross Reference
sys/sys/ipc.h

     /*      $NetBSD: ipc.h,v 1.37 2018/06/23 07:23:06 gson Exp $    */
     
     /*
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
     * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * This code is derived from software contributed to Berkeley by
     * the Systems Programming Group of the University of Utah Computer
     * Science Department.
     *
     * 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. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
     *
     *      @(#)ipc.h       8.4 (Berkeley) 2/19/95
     */
    
    /*
     * SVID compatible ipc.h file
     */
    
    #ifndef _SYS_IPC_H_
    #define _SYS_IPC_H_
    
    #include <sys/featuretest.h>
    #include <sys/types.h>
    
    struct ipc_perm {
            uid_t           uid;    /* user id */
            gid_t           gid;    /* group id */
            uid_t           cuid;   /* creator user id */
            gid_t           cgid;   /* creator group id */
            mode_t          mode;   /* r/w permission */
    
            /*
             * These members are private and used only in the internal
             * implementation of this interface.
             */
            unsigned short  _seq;   /* sequence # (to generate unique
                                       msg/sem/shm id) */
            key_t           _key;   /* user specified msg/sem/shm key */
    };
    
    #if defined(_NETBSD_SOURCE)
    /* Warning: 64-bit structure padding is needed here */
    struct ipc_perm_sysctl {
            uint64_t        _key;
            uid_t           uid;
            gid_t           gid;
            uid_t           cuid;
            gid_t           cgid;
            mode_t          mode;
            int16_t         _seq;
            int16_t         pad;
    };
    #endif /* _NETBSD_SOURCE */
    
    /* Common access type bits, used with ipcperm(). */
    #define IPC_R           000400  /* read permission */
    #define IPC_W           000200  /* write/alter permission */
    #define IPC_M           010000  /* permission to change control info */
    
    /* X/Open required constants (same values as system 5) */
    #define IPC_CREAT       001000  /* create entry if key does not exist */
    #define IPC_EXCL        002000  /* fail if key exists */
    #define IPC_NOWAIT      004000  /* error if request must wait */
    
    #define IPC_PRIVATE     (key_t)0 /* private key */
    
    #define IPC_RMID        0       /* remove identifier */
    #define IPC_SET         1       /* set options */
    #define IPC_STAT        2       /* get options */
    
   /*
    * Macros to convert between ipc ids and array indices or sequence ids.
    * The first of these is used by ipcs(1), and so is defined outside the
    * kernel as well.
    */
   #if defined(_NETBSD_SOURCE)
   #define IXSEQ_TO_IPCID(ix,perm) (((perm._seq) << 16) | (ix & 0xffff))
   #endif
   
   #ifdef _KERNEL
   #include <sys/sysctl.h>
   #define IPCID_TO_IX(id)         ((id) & 0xffff)
   #define IPCID_TO_SEQ(id)        (((id) >> 16) & 0xffff)
   
   struct kauth_cred;
   __BEGIN_DECLS
   int     ipcperm(struct kauth_cred *, struct ipc_perm *, int);
   
   void    sysvipcinit(void);
   void    sysvipcfini(void);
   __END_DECLS
   
   /*
    * sysctl helper routine for kern.ipc.sysvipc_info subtree.
    */
   
   #define SYSCTL_FILL_PERM(src, dst) do { \
           (dst)._key = (src)._key; \
           (dst).uid = (src).uid; \
           (dst).gid = (src).gid; \
           (dst).cuid = (src).cuid; \
           (dst).cgid = (src).cgid; \
           (dst).mode = (src).mode; \
           (dst)._seq = (src)._seq; \
   } while (/*CONSTCOND*/ 0)
   
   /*
    * Set-up the sysctl routine for COMPAT_50
    */
   
   __BEGIN_DECLS
   void sysvipc50_set_compat_sysctl(int (*)(SYSCTLFN_PROTO));
   __END_DECLS
   
   #else /* _KERNEL */
   __BEGIN_DECLS
   key_t   ftok(const char *, int);
   __END_DECLS
   #endif
   #endif /* !_SYS_IPC_H_ */

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