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Annotation of coherent/c/usr/include/sys/shm.h, revision 1.1

1.1     ! root        1: /* (-lgl
        !             2:  *     COHERENT Version 3.0
        !             3:  *     Copyright (c) 1982, 1990 by Mark Williams Company.
        !             4:  *     All rights reserved. May not be copied without permission.
        !             5:  -lgl) */
        !             6: #ifndef SHM_H
        !             7: #define        SHM_H
        !             8: /*
        !             9: **     IPC Shared Memory Facility.
        !            10: */
        !            11: 
        !            12: #include <sys/ipc.h>
        !            13: #include <sys/types.h>
        !            14: 
        !            15: extern int shmfd;              /* file descriptor to access shared memory */
        !            16: 
        !            17: /*
        !            18: **     Permission Definitions.
        !            19: */
        !            20: #define        SHM_R   0400            /* read permission */
        !            21: #define        SHM_W   0200            /* write permission */
        !            22: 
        !            23: /*
        !            24: **     ipc_perm Mode Definitions.
        !            25: */
        !            26: #define        SHM_CLEAR       01000   /* clear segment on next attach */
        !            27: #define        SHM_DEST        02000   /* destroy segment when # attached = 0 */
        !            28: 
        !            29: /*
        !            30: **     Message Operations Flags.
        !            31: */
        !            32: #define        SHM_RDONLY      010000  /* attach read-only (else read-write) */
        !            33: 
        !            34: /*
        !            35: **     There is a shared mem id data structure for each segment in the system.
        !            36: */
        !            37: struct shmid_ds {
        !            38:        struct ipc_perm shm_perm;       /* operation permission struct */
        !            39:        int             shm_segsz;      /* segment size */
        !            40:        unsigned short  shm_lpid;       /* pid of last shmop */
        !            41:        unsigned short  shm_cpid;       /* pid of creator */
        !            42:        unsigned short  shm_nattch;     /* current # attached */
        !            43:        unsigned short  shm_cnattch;    /* in memory # attached */
        !            44:        time_t          shm_atime;      /* last shmat time */
        !            45:        time_t          shm_dtime;      /* last shmdt time */
        !            46:        time_t          shm_ctime;      /* last change time */
        !            47: };
        !            48: 
        !            49: /*
        !            50: **     Ioctl Commands issued to Shared Memory Device Driver (on Coherent).
        !            51: */
        !            52: #define        SHMIOC  ('H'<<8)
        !            53: #define        SHMCTL  (SHMIOC+'C')
        !            54: #define        SHMGET  (SHMIOC+'G')
        !            55: #define        SHMAT   (SHMIOC+'A')
        !            56: #define        SHMDT   (SHMIOC+'D')
        !            57: 
        !            58: #endif

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