patch-1.3.48 linux/arch/mips/kernel/ipc.c

• Lines: 114
• Date: Wed Dec 13 12:39:43 1995
• Orig file: v1.3.47/linux/arch/mips/kernel/ipc.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.47/linux/arch/mips/kernel/ipc.c linux/arch/mips/kernel/ipc.c
@@ -0,0 +1,113 @@
+/*
+ * linux/arch/mips/kernel/ipc.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/i386
+ * platform.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+
+#include <asm/segment.h>
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly;  removing this will need some minor
+ * changes in libc.
+ */
+asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
+{
+#ifdef CONFIG_SYSVIPC
+	int version;
+
+	version = call >> 16; /* hack for backward compatibility */
+	call &= 0xffff;
+
+	if (call <= SEMCTL)
+		switch (call) {
+		case SEMOP:
+			return sys_semop (first, (struct sembuf *)ptr, second);
+		case SEMGET:
+			return sys_semget (first, second, third);
+		case SEMCTL: {
+			union semun fourth;
+			int err;
+			if (!ptr)
+				return -EINVAL;
+			if ((err = verify_area (VERIFY_READ, ptr, sizeof(long))))
+				return err;
+			fourth.__pad = (void *) get_fs_long(ptr);
+			return sys_semctl (first, second, third, fourth);
+			}
+		default:
+			return -EINVAL;
+		}
+	if (call <= MSGCTL) 
+		switch (call) {
+		case MSGSND:
+			return sys_msgsnd (first, (struct msgbuf *) ptr, 
+					   second, third);
+		case MSGRCV:
+			switch (version) {
+			case 0: {
+				struct ipc_kludge tmp;
+				int err;
+				if (!ptr)
+					return -EINVAL;
+				if ((err = verify_area (VERIFY_READ, ptr, sizeof(tmp))))
+					return err;
+				memcpy_fromfs (&tmp,(struct ipc_kludge *) ptr,
+					       sizeof (tmp));
+				return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
+				}
+			case 1: default:
+				return sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
+			}
+		case MSGGET:
+			return sys_msgget ((key_t) first, second);
+		case MSGCTL:
+			return sys_msgctl (first, second, (struct msqid_ds *) ptr);
+		default:
+			return -EINVAL;
+		}
+	if (call <= SHMCTL) 
+		switch (call) {
+		case SHMAT:
+			switch (version) {
+			case 0: default: {
+				ulong raddr;
+				int err;
+				if ((err = verify_area(VERIFY_WRITE, (ulong*) third, sizeof(ulong))))
+					return err;
+				err = sys_shmat (first, (char *) ptr, second, &raddr);
+				if (err)
+					return err;
+				put_fs_long (raddr, (ulong *) third);
+				return 0;
+				}
+			case 1:	/* iBCS2 emulator entry point */
+				if (get_fs() != get_ds())
+					return -EINVAL;
+				return sys_shmat (first, (char *) ptr, second, (ulong *) third);
+			}
+		case SHMDT: 
+			return sys_shmdt ((char *)ptr);
+		case SHMGET:
+			return sys_shmget (first, second, third);
+		case SHMCTL:
+			return sys_shmctl (first, second, (struct shmid_ds *) ptr);
+		default:
+			return -EINVAL;
+		}
+	return -EINVAL;
+#else /* CONFIG_SYSVIPC */
+	return -ENOSYS;
+#endif /* CONFIG_SYSVIPC */
+}