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Macros | |
- SHM_NO_PID
No pid protection - MPE/iX only
- SHM_PRIV_ACCESS
Privileged area - MPE/iX only
- SHM_RDONLY
Read access only
- SHM_RND
Round attach address (not implemented)
- SHM_DEST
Delete when attach = 0 (not implemented)
- SHM_CLEAR
Clear on first attach (not implemented)
- SHM_LOCK
Not implemented
- SHM_UNLOCK
Not implemented
Functions | |
If __STDC__ is defined:
extern char *shmat( int, char *m, int );
extern int shmctl( int, int, struct shmid_ds * );
extern int shmdt ( char * );
extern int shmget( key_t, int, int );
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If __STDC__ is not defined:
extern char *shmat( );
extern int shmctl( );
extern int shmdt ( );
extern int shmget( );
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Structures | |
Shared memory ID control structure:
struct shmid_ds {
struct ipc_perm shm_perm; /* permission structure */
int shm_segsz; /* segment size */
void *shm_ptbl; /* not used on MPE/iX */
pid_t shm_lpid; /* pid of last shmop call */
pid_t shm_cpid; /* pid of last change */
int shm_nattch; /* attached users */
int shm_cnattch; /* in memory attached users ?? */
time_t shm_atime; /* last shmat time */
time_t shm_dtime; /* last shmdt time */
time_t shm_ctime; /* last change time */
void *shm_ptr; /* pointer to the shm area. */
};
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