| #ifndef _LINUX_SHM_H_ |
| #define _LINUX_SHM_H_ |
| |
| #include <linux/ipc.h> |
| #include <linux/errno.h> |
| #include <unistd.h> |
| |
| /* |
| * SHMMNI, SHMMAX and SHMALL are default upper limits which can be |
| * modified by sysctl. The SHMMAX and SHMALL values have been chosen to |
| * be as large possible without facilitating scenarios where userspace |
| * causes overflows when adjusting the limits via operations of the form |
| * "retrieve current limit; add X; update limit". It is therefore not |
| * advised to make SHMMAX and SHMALL any larger. These limits are |
| * suitable for both 32 and 64-bit systems. |
| */ |
| #define SHMMIN 1 /* min shared seg size (bytes) */ |
| #define SHMMNI 4096 /* max num of segs system wide */ |
| #define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */ |
| #define SHMALL (ULONG_MAX - (1UL << 24)) /* max shm system wide (pages) */ |
| #define SHMSEG SHMMNI /* max shared segs per process */ |
| |
| /* 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; |
| __kernel_ulong_t shm_tot; /* total allocated shm */ |
| __kernel_ulong_t shm_rss; /* total resident shm */ |
| __kernel_ulong_t shm_swp; /* total swapped shm */ |
| __kernel_ulong_t swap_attempts; |
| __kernel_ulong_t swap_successes; |
| }; |
| |
| |
| #endif /* _LINUX_SHM_H_ */ |
