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Annotation of coherent/d/PS2_KERNEL/include/sys/shm.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 4.0
                      3:  *     Copyright (c) 1982, 1992 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: 
                     16: extern int shmfd;              /* file descriptor to access shared memory */
                     17: 
                     18: 
                     19: /*
                     20: **     Permission Definitions.
                     21: */
                     22: #define        SHM_R   0400            /* read permission */
                     23: #define        SHM_W   0200            /* write permission */
                     24: 
                     25: /*
                     26: **     ipc_perm Mode Definitions.
                     27: */
                     28: #define        SHM_CLEAR       01000   /* clear segment on next attach */
                     29: #define        SHM_DEST        02000   /* destroy segment when # attached = 0 */
                     30: 
                     31: /*
                     32: **     Message Operations Flags.
                     33: */
                     34: #define        SHM_RDONLY      010000  /* attach read-only (else read-write) */
                     35: 
                     36: /*
                     37: **     There is a shared mem id data structure for each segment in the system.
                     38: */
                     39: struct shmid_ds {
                     40:        struct ipc_perm shm_perm;       /* operation permission struct */
                     41:        int             shm_segsz;      /* segment size */
                     42: #ifdef _I386
                     43:        unsigned short  shm_cpid;       /* pid of creator */
                     44:        unsigned short  shm_lpid;       /* pid of last shmop */
                     45: #else
                     46:        unsigned short  shm_lpid;       /* pid of last shmop */
                     47:        unsigned short  shm_cpid;       /* pid of creator */
                     48: #endif
                     49:        unsigned short  shm_nattch;     /* current # attached */
                     50: #ifndef _I386
                     51:        unsigned short  shm_cnattch;    /* in memory # attached */
                     52: #endif
                     53:        time_t          shm_atime;      /* last shmat time */
                     54:        time_t          shm_dtime;      /* last shmdt time */
                     55:        time_t          shm_ctime;      /* last change time */
                     56: };
                     57: 
                     58: /*
                     59: **     Ioctl Commands issued to Shared Memory Device Driver (on Coherent).
                     60: */
                     61: #define        SHMIOC  ('H'<<8)
                     62: #define        SHMCTL  (SHMIOC+'C')
                     63: #define        SHMGET  (SHMIOC+'G')
                     64: #define        SHMAT   (SHMIOC+'A')
                     65: #define        SHMDT   (SHMIOC+'D')
                     66: 
                     67: #endif

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