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Annotation of coherent/f/usr/include.78/sys/shm.h, revision 1.1.1.1

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 __SYS_SHM_H__
                      7: #define        __SYS_SHM_H__
                      8: /*
                      9: **     IPC Shared Memory Facility.
                     10: */
                     11: #include <sys/ipc.h>
                     12: #include <sys/_time.h>
                     13: 
                     14: extern int shmfd;              /* file descriptor to access shared memory */
                     15: 
                     16: /*
                     17: **     Permission Definitions.
                     18: */
                     19: #define        SHM_R   0400            /* read permission */
                     20: #define        SHM_W   0200            /* write permission */
                     21: 
                     22: /*
                     23: **     ipc_perm Mode Definitions.
                     24: */
                     25: #define        SHM_CLEAR       01000   /* clear segment on next attach */
                     26: #define        SHM_DEST        02000   /* destroy segment when # attached = 0 */
                     27: 
                     28: /*
                     29: **     Message Operations Flags.
                     30: */
                     31: #define        SHM_RDONLY      010000  /* attach read-only (else read-write) */
                     32: #define SHM_RND                020000  /* round attach address to SHMLBA */
                     33: 
                     34: /* 
                     35:  * Shared memory control operations (are not included in iBCS2)
                     36:  * COHERENT 4.0.x does not use a swapper.
                     37:  */
                     38: #define        SHM_LOCK        3       /* lock shared memory segment in core */
                     39: #define SHM_UNLOCK     4       /* unlock shared memory segment */
                     40: 
                     41: /*
                     42: **     There is a shared mem id data structure for each segment in the system.
                     43: */
                     44: struct shmid_ds {
                     45:        struct ipc_perm shm_perm;       /* operation permission struct */
                     46:        int             shm_segsz;      /* segment size */
                     47: #ifdef _I386
                     48:        unsigned short  shm_cpid;       /* pid of creator */
                     49:        unsigned short  shm_lpid;       /* pid of last shmop */
                     50: #else
                     51:        unsigned short  shm_lpid;       /* pid of last shmop */
                     52:        unsigned short  shm_cpid;       /* pid of creator */
                     53: #endif
                     54:        unsigned short  shm_nattch;     /* current # attached */
                     55: #ifndef _I386
                     56:        unsigned short  shm_cnattch;    /* in memory # attached */
                     57: #endif
                     58:        time_t          shm_atime;      /* last shmat time */
                     59:        time_t          shm_dtime;      /* last shmdt time */
                     60:        time_t          shm_ctime;      /* last change time */
                     61: };
                     62: 
                     63: /*
                     64: **     Ioctl Commands issued to Shared Memory Device Driver (on Coherent).
                     65: */
                     66: #define        SHMIOC  ('H'<<8)
                     67: #define        SHMCTL  (SHMIOC+'C')
                     68: #define        SHMGET  (SHMIOC+'G')
                     69: #define        SHMAT   (SHMIOC+'A')
                     70: #define        SHMDT   (SHMIOC+'D')
                     71: 
                     72: #endif

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