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Annotation of coherent/c/usr/include/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 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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