cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / linux / shm.h

diff --git a/i686-linux-gnu-4.7/usr/include/linux/shm.h b/i686-linux-gnu-4.7/usr/include/linux/shm.h
new file mode 100644 (file)
index 0000000..168e552
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/linux/shm.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_SHM_H_
+#define _LINUX_SHM_H_
+
+#include <linux/ipc.h>
+#include <linux/errno.h>
+#include <asm-generic/hugetlb_encode.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>
+
+/*
+ * shmget() shmflg values.
+ */
+/* The bottom nine bits are the same as open(2) mode flags */
+#define SHM_R          0400    /* or S_IRUGO from <linux/stat.h> */
+#define SHM_W          0200    /* or S_IWUGO from <linux/stat.h> */
+/* Bits 9 & 10 are IPC_CREAT and IPC_EXCL */
+#define SHM_HUGETLB    04000   /* segment will use huge TLB pages */
+#define SHM_NORESERVE  010000  /* don't check for reservations */
+
+/*
+ * Huge page size encoding when SHM_HUGETLB is specified, and a huge page
+ * size other than the default is desired.  See hugetlb_encode.h
+ */
+#define SHM_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define SHM_HUGE_MASK  HUGETLB_FLAG_ENCODE_MASK
+
+#define SHM_HUGE_64KB  HUGETLB_FLAG_ENCODE_64KB
+#define SHM_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB
+#define SHM_HUGE_1MB   HUGETLB_FLAG_ENCODE_1MB
+#define SHM_HUGE_2MB   HUGETLB_FLAG_ENCODE_2MB
+#define SHM_HUGE_8MB   HUGETLB_FLAG_ENCODE_8MB
+#define SHM_HUGE_16MB  HUGETLB_FLAG_ENCODE_16MB
+#define SHM_HUGE_32MB  HUGETLB_FLAG_ENCODE_32MB
+#define SHM_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB
+#define SHM_HUGE_512MB HUGETLB_FLAG_ENCODE_512MB
+#define SHM_HUGE_1GB   HUGETLB_FLAG_ENCODE_1GB
+#define SHM_HUGE_2GB   HUGETLB_FLAG_ENCODE_2GB
+#define SHM_HUGE_16GB  HUGETLB_FLAG_ENCODE_16GB
+
+/*
+ * shmat() shmflg values
+ */
+#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
+#define SHM_STAT_ANY    15
+
+/* 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_ */