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

     /* $FreeBSD: releng/12.0/sys/sys/shm.h 329348 2018-02-16 01:33:01Z brooks $ */
     /*      $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
     
     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 1994 Adam Glass
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Adam Glass.
     * 4. 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.
     */
    
    /*
     * As defined+described in "X/Open System Interfaces and Headers"
     *                         Issue 4, p. XXX
     */
    
    #ifndef _SYS_SHM_H_
    #define _SYS_SHM_H_
    
    #include <sys/cdefs.h>
    #ifdef _WANT_SYSVSHM_INTERNALS
    #define _WANT_SYSVIPC_INTERNALS
    #endif
    #include <sys/ipc.h>
    #include <sys/_types.h>
    
    #include <machine/param.h>
    
    #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */
    #define SHM_RND     020000  /* Round attach address to SHMLBA */
    #define SHMLBA      PAGE_SIZE /* Segment low boundary address multiple */
    
    /* "official" access mode definitions; somewhat braindead since you have
       to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
    #define SHM_R       (IPC_R)
    #define SHM_W       (IPC_W)
    
    /* predefine tbd *LOCK shmctl commands */
    #define SHM_LOCK        11
    #define SHM_UNLOCK      12
    
    /* ipcs shmctl commands for Linux compatibility */
    #define SHM_STAT        13
    #define SHM_INFO        14
    
    #ifndef _PID_T_DECLARED
    typedef __pid_t         pid_t;
    #define _PID_T_DECLARED
    #endif
    
    #ifndef _TIME_T_DECLARED
    typedef __time_t        time_t;
    #define _TIME_T_DECLARED
    #endif
    
    #ifndef _SIZE_T_DECLARED
    typedef __size_t        size_t;
    #define _SIZE_T_DECLARED
    #endif
    
    #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
        defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
    struct shmid_ds_old {
            struct ipc_perm_old shm_perm;   /* operation permission structure */
            int             shm_segsz;      /* size of segment in bytes */
            pid_t           shm_lpid;   /* process ID of last shared memory op */
            pid_t           shm_cpid;       /* process ID of creator */
            short           shm_nattch;     /* number of current attaches */
            time_t          shm_atime;      /* time of last shmat() */
            time_t          shm_dtime;      /* time of last shmdt() */
            time_t          shm_ctime;      /* time of last change by shmctl() */
            void           *shm_internal;   /* sysv stupidity */
    };
    #endif
    
   typedef unsigned int shmatt_t;
   
   struct shmid_ds {
           struct ipc_perm shm_perm;       /* operation permission structure */
           size_t          shm_segsz;      /* size of segment in bytes */
           pid_t           shm_lpid;   /* process ID of last shared memory op */
           pid_t           shm_cpid;       /* process ID of creator */
           shmatt_t        shm_nattch;     /* number of current attaches */
           time_t          shm_atime;      /* time of last shmat() */
           time_t          shm_dtime;      /* time of last shmdt() */
           time_t          shm_ctime;      /* time of last change by shmctl() */
   };
   
   #if defined(_KERNEL) || defined(_WANT_SYSVSHM_INTERNALS)
   /*
    * System 5 style catch-all structure for shared memory constants that
    * might be of interest to user programs.  Do we really want/need this?
    */
   struct shminfo {
           u_long  shmmax;         /* max shared memory segment size (bytes) */
           u_long  shmmin;         /* max shared memory segment size (bytes) */
           u_long  shmmni;         /* max number of shared memory identifiers */
           u_long  shmseg;         /* max shared memory segments per process */
           u_long  shmall;         /* max amount of shared memory (pages) */
   };
   
   struct vm_object;
   
   /* 
    * Add a kernel wrapper to the shmid_ds struct so that private info (like the
    * MAC label) can be added to it, without changing the user interface.
    */
   struct shmid_kernel {
           struct shmid_ds u;
           struct vm_object *object;
           struct label *label;    /* MAC label */
           struct ucred *cred;     /* creator's credendials */
   };
   #endif
   
   struct shm_info {
           int used_ids;
           unsigned long shm_tot;
           unsigned long shm_rss;
           unsigned long shm_swp;
           unsigned long swap_attempts;
           unsigned long swap_successes;
   };
   
   #ifdef _KERNEL
   struct proc;
   struct vmspace;
   
   extern struct shminfo   shminfo;
   
   void    shmexit(struct vmspace *);
   void    shmfork(struct proc *, struct proc *);
   
   #else /* !_KERNEL */
   
   #include <sys/cdefs.h>
   
   #ifndef _SIZE_T_DECLARED
   typedef __size_t        size_t;
   #define _SIZE_T_DECLARED
   #endif
   
   __BEGIN_DECLS
   #if __BSD_VISIBLE
   int shmsys(int, ...);
   #endif
   void *shmat(int, const void *, int);
   int shmget(key_t, size_t, int);
   int shmctl(int, int, struct shmid_ds *);
   int shmdt(const void *);
   __END_DECLS
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_SHM_H_ */

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