8a54d267f0
- sys_getbiosbuffer feature is gone (from kernel; available from vm) - bump version number because munmap() calls that newly compiled binaries will do trigger an ugly (but harmless) error message in older VM's - some new VM calls and flags, the new IPC calls - some new CR0 register bits - added files for shared memory
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
#ifndef _SYS_SHM_H
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#define _SYS_SHM_H
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <unistd.h>
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typedef unsigned long int shmatt_t;
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#define SHMLBA getpagesize()
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#define SHMMNI 4096
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#define SHMSEG 32 /* max shared segs per process */
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struct shmid_ds
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{
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struct ipc_perm shm_perm; /* Ownership and permissions */
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size_t shm_segsz; /* Size of segment (bytes) */
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time_t shm_atime; /* Last attach time */
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time_t shm_dtime; /* Last detach time */
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time_t shm_ctime; /* Last change time */
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pid_t shm_cpid; /* PID of creator */
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pid_t shm_lpid; /* PID of last shmat()/shmdt() */
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shmatt_t shm_nattch; /* No. of current attaches */
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};
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/* Permission flag for shmget. */
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#define SHM_R 0400
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#define SHM_W 0200
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#define SHM_RDONLY 010000 /* attach read-only else read-write */
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#define SHM_RND 020000 /* round attach address to SHMLBA */
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/* shm_mode upper byte flags */
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#define SHM_DEST 01000 /* segment will be destroyed on last detach */
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#define SHM_LOCKED 02000 /* segment will not be swapped */
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/* ipcs ctl commands */
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#define SHM_STAT 13
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#define SHM_INFO 14
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struct shminfo
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{
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unsigned long int shmmax;
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unsigned long int shmmin;
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unsigned long int shmmni;
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unsigned long int shmseg;
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unsigned long int shmall;
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};
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struct shm_info
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{
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int used_ids;
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unsigned long int shm_tot; /* total allocated shm */
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unsigned long int shm_rss; /* total resident shm */
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unsigned long int shm_swp; /* total swapped shm */
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unsigned long int swap_attempts;
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unsigned long int swap_successes;
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};
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/* The following System V style IPC functions implement a shared memory
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* facility. The definition is found in XPG4.2.
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*/
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/* Shared memory control operation. */
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_PROTOTYPE( int shmctl, (int __shmid, int __cmd, struct shmid_ds *__buf));
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/* Get shared memory segment. */
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_PROTOTYPE( int shmget, (key_t __key, size_t __size, int __shmflg));
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/* Attach shared memory segment. */
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_PROTOTYPE( void *shmat, (int __shmid, const void *__shmaddr, int __shmflg));
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/* Deattach shared memory segment. */
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_PROTOTYPE( int shmdt, (const void *__shmaddr));
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#endif /* _SYS_SHM_H */
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