diff options
Diffstat (limited to 'include/linux/shm.h')
| -rw-r--r-- | include/linux/shm.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/include/linux/shm.h b/include/linux/shm.h new file mode 100644 index 00000000..92808b86 --- /dev/null +++ b/include/linux/shm.h @@ -0,0 +1,130 @@ +#ifndef _LINUX_SHM_H_ +#define _LINUX_SHM_H_ + +#include <linux/ipc.h> +#include <linux/errno.h> +#ifdef __KERNEL__ +#include <asm/page.h> +#else +#include <unistd.h> +#endif + +/* + * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can + * be increased by sysctl + */ + +#define SHMMAX 0x2000000 /* max shared seg size (bytes) */ +#define SHMMIN 1 /* min shared seg size (bytes) */ +#define SHMMNI 4096 /* max num of segs system wide */ +#ifdef __KERNEL__ +#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ +#else +#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16)) +#endif +#define SHMSEG SHMMNI /* max shared segs per process */ + +#ifdef __KERNEL__ +#include <asm/shmparam.h> +#endif + +/* Obsolete, used only for backwards compatibility and libc5 compiles */ +struct shmid_ds { + struct ipc_perm shm_perm; /* operation perms */ + int shm_segsz; /* size of segment (bytes) */ + __kernel_time_t shm_atime; /* last attach time */ + __kernel_time_t shm_dtime; /* last detach time */ + __kernel_time_t shm_ctime; /* last change time */ + __kernel_ipc_pid_t shm_cpid; /* pid of creator */ + __kernel_ipc_pid_t shm_lpid; /* pid of last operator */ + unsigned short shm_nattch; /* no. of current attaches */ + unsigned short shm_unused; /* compatibility */ + void *shm_unused2; /* ditto - used by DIPC */ + void *shm_unused3; /* unused */ +}; + +/* Include the definition of shmid64_ds and shminfo64 */ +#include <asm/shmbuf.h> + +/* permission flag for shmget */ +#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ +#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ + +/* mode for attach */ +#define SHM_RDONLY 010000 /* read-only access */ +#define SHM_RND 020000 /* round attach address to SHMLBA boundary */ +#define SHM_REMAP 040000 /* take-over region on attach */ +#define SHM_EXEC 0100000 /* execution access */ + +/* super user shmctl commands */ +#define SHM_LOCK 11 +#define SHM_UNLOCK 12 + +/* ipcs ctl commands */ +#define SHM_STAT 13 +#define SHM_INFO 14 + +/* Obsolete, used only for backwards compatibility */ +struct shminfo { + int shmmax; + int shmmin; + int shmmni; + int shmseg; + int shmall; +}; + +struct shm_info { + int used_ids; + unsigned long shm_tot; /* total allocated shm */ + unsigned long shm_rss; /* total resident shm */ + unsigned long shm_swp; /* total swapped shm */ + unsigned long swap_attempts; + unsigned long swap_successes; +}; + +#ifdef __KERNEL__ +struct shmid_kernel /* private to the kernel */ +{ + struct kern_ipc_perm shm_perm; + struct file * shm_file; + unsigned long shm_nattch; + unsigned long shm_segsz; + time_t shm_atim; + time_t shm_dtim; + time_t shm_ctim; + pid_t shm_cprid; + pid_t shm_lprid; + struct user_struct *mlock_user; + + /* The task created the shm object. NULL if the task is dead. */ + struct task_struct *shm_creator; +}; + +/* shm_mode upper byte flags */ +#define SHM_DEST 01000 /* segment will be destroyed on last detach */ +#define SHM_LOCKED 02000 /* segment will not be swapped */ +#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ +#define SHM_NORESERVE 010000 /* don't check for reservations */ + +#ifdef CONFIG_SYSVIPC +long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr); +extern int is_file_shm_hugepages(struct file *file); +extern void exit_shm(struct task_struct *task); +#else +static inline long do_shmat(int shmid, char __user *shmaddr, + int shmflg, unsigned long *addr) +{ + return -ENOSYS; +} +static inline int is_file_shm_hugepages(struct file *file) +{ + return 0; +} +static inline void exit_shm(struct task_struct *task) +{ +} +#endif + +#endif /* __KERNEL__ */ + +#endif /* _LINUX_SHM_H_ */ |