From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- include/uapi/linux/shm.h | 80 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 include/uapi/linux/shm.h (limited to 'include/uapi/linux/shm.h') diff --git a/include/uapi/linux/shm.h b/include/uapi/linux/shm.h new file mode 100644 index 000000000..1fbf24ea3 --- /dev/null +++ b/include/uapi/linux/shm.h @@ -0,0 +1,80 @@ +#ifndef _UAPI_LINUX_SHM_H_ +#define _UAPI_LINUX_SHM_H_ + +#include +#include +#ifndef __KERNEL__ +#include +#endif + +/* + * 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 + +/* permission flag for shmget */ +#define SHM_R 0400 /* or S_IRUGO from */ +#define SHM_W 0200 /* or S_IWUGO from */ + +/* 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 /* _UAPI_LINUX_SHM_H_ */ -- cgit v1.2.3-54-g00ecf