patch-1.3.2 linux/arch/i386/kernel/sys_i386.c

• Lines: 137
• Date: Fri Jun 16 21:11:21 1995
• Orig file: v1.3.1/linux/arch/i386/kernel/sys_i386.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.1/linux/arch/i386/kernel/sys_i386.c linux/arch/i386/kernel/sys_i386.c
@@ -0,0 +1,136 @@
+/*
+ * linux/arch/i386/kernel/sys_i386.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 <linux/stat.h>
+
+#include <asm/segment.h>
+
+/*
+ * Perform the select(nd, in, out, ex, tv) system call.
+ * Linux/i386 didn't use to be able to handle 5 system call
+ * parameters, so the old select used a memory block for
+ * parameter passing..
+ */
+extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
+
+asmlinkage int old_select(unsigned long *buffer)
+{
+	int n;
+	fd_set *inp;
+	fd_set *outp;
+	fd_set *exp;
+	struct timeval *tvp;
+
+	n = verify_area(VERIFY_READ, buffer, 5*sizeof(unsigned long));
+	if (n)
+		return n;
+	n = get_user(buffer);
+	inp = (fd_set *) get_user(buffer+1);
+	outp = (fd_set *) get_user(buffer+2);
+	exp = (fd_set *) get_user(buffer+3);
+	tvp = (struct timeval *) get_user(buffer+4);
+	return sys_select(n, inp, outp, exp, tvp);
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
+{
+	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;
+}