numerous fixes to sysv ipc

some of these definitions were just plain wrong, others based on
outdated ancient "non-64" versions of the kernel interface.

as much as possible has now been moved out of bits/*

these changes break abi (the old abi for these functions was wrong),
but since they were not working anyway it can hardly matter.

include/sys/shm.h

@@ -10,6 +10,34 @@
 #include <sys/ipc.h>
 #include <bits/shm.h>
 
+#define SHM_RDONLY 010000
+#define SHM_RND    020000
+#define SHM_REMAP  040000
+#define SHM_EXEC   0100000
+
+#define SHM_LOCK 11
+#define SHM_UNLOCK 12
+#define SHM_STAT 13
+#define SHM_INFO 14
+#define SHM_DEST 01000
+#define SHM_LOCKED 02000
+#define SHM_HUGETLB 04000
+#define SHM_NORESERVE 010000
+
+struct shminfo {
+	unsigned long shmmax, shmmin, shmmni, shmseg, shmall, __unused[4];
+};
+
+struct shm_info {
+	int used_ids;
+	unsigned long shm_tot, shm_rss, shm_swp;
+#ifdef _GNU_SOURCE
+	unsigned long swap_attempts, swap_successes;
+#else
+	unsigned long __reserved[2];
+#endif
+};
+
 void *shmat(int, const void *, int);
 int shmctl(int, int, struct shmid_ds *);
 int shmdt(const void *);