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Annotation of Net2/sys/shm.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 University of Utah.
                      3:  * Copyright (c) 1990 The Regents of the University of California.
                      4:  * All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * the Systems Programming Group of the University of Utah Computer
                      8:  * Science Department.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  *
                     38:  *     @(#)shm.h       7.2 (Berkeley) 2/5/91
                     39:  */
                     40: 
                     41: /*
                     42:  * SVID compatible shm.h file
                     43:  */
                     44: #ifndef _SHM_H_
                     45: #define _SHM_H_
                     46: 
                     47: #ifdef KERNEL
                     48: #include "ipc.h"
                     49: #else
                     50: #include <sys/ipc.h>
                     51: #endif
                     52: 
                     53: struct shmid_ds {
                     54:        struct  ipc_perm shm_perm;      /* operation perms */
                     55:        int     shm_segsz;              /* size of segment (bytes) */
                     56:        ushort  shm_cpid;               /* pid, creator */
                     57:        ushort  shm_lpid;               /* pid, last operation */
                     58:        short   shm_nattch;             /* no. of current attaches */
                     59:        time_t  shm_atime;              /* last attach time */
                     60:        time_t  shm_dtime;              /* last detach time */
                     61:        time_t  shm_ctime;              /* last change time */
                     62:        void    *shm_handle;            /* internal handle for shm segment */
                     63: };
                     64: 
                     65: /*
                     66:  * System 5 style catch-all structure for shared memory constants that
                     67:  * might be of interest to user programs.  Do we really want/need this?
                     68:  */
                     69: struct shminfo {
                     70:        int     shmmax;         /* max shared memory segment size (bytes) */
                     71:        int     shmmin;         /* min shared memory segment size (bytes) */
                     72:        int     shmmni;         /* max number of shared memory identifiers */
                     73:        int     shmseg;         /* max shared memory segments per process */
                     74:        int     shmall;         /* max amount of shared memory (pages) */
                     75: };
                     76: 
                     77: /* internal "mode" bits */
                     78: #define        SHM_ALLOC       01000   /* segment is allocated */
                     79: #define        SHM_DEST        02000   /* segment will be destroyed on last detach */
                     80: 
                     81: /* SVID required constants (same values as system 5) */
                     82: #define        SHM_RDONLY      010000  /* read-only access */
                     83: #define        SHM_RND         020000  /* round attach address to SHMLBA boundary */
                     84: 
                     85: /* implementation constants */
                     86: #define        SHMLBA          CLBYTES /* segment low boundary address multiple */
                     87: #define        SHMMMNI         512     /* maximum value for shminfo.shmmni */
                     88: 
                     89: #ifdef KERNEL
                     90: struct shmid_ds        *shmsegs;
                     91: struct shminfo         shminfo;
                     92: #endif
                     93: 
                     94: #endif /* !_SHM_H_ */

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