Round of cleanups and enhancements. These include (in random order):

o  Introduce private types for use in linux syscalls for two reasons:
   1. establish type independence for ease in porting and,
   2. provide a visual queue as to which syscalls have proper
      prototypes to further cleanup the i386/alpha split.
   Linuxulator types are prefixed by 'l_'. void and char have not
   been "virtualized".

o  Provide dummy functions for all syscalls and remove dummy functions
   or implementations of truely obsolete syscalls.

o  Sanitize the shm*, sem* and msg* syscalls.

o  Make a first attempt to implement the linux_sysctl syscall. At this
   time it only returns one MIB (KERN_VERSION), but most importantly,
   it tells us when we need to add additional sysctls :-)

o  Bump the kenel version up to 2.4.2 (this is not the same as the
   KERN_VERSION MIB, BTW).

o  Implement new syscalls, of which most are specific to i386. Our
   syscall table is now up to date with Linux 2.4.2. Some highlights:
   -  Implement the 32-bit uid_t and gid_t bases syscalls.
   -  Implement a couple of 64-bit file size/offset bases syscalls.

o  Fix or improve numerous syscalls and prototypes.

o  Reduce style(9) violations while I'm here. Especially indentation
   inconsistencies within the same file are addressed. Re-indenting
   did not obfuscate actual changes to the extend that it could not
   be combined.

NOTE: I spend some time testing these changes and found that if there
      were regressions, they were not caused by these changes AFAICT.
      It was observed that installing a RH 7.1 runtime environment
      did make matters worse. Hangs and/or reboots have been observed
      with and without these changes, so when it failed to make life
      better in cases it doesn't look like it made it worse.

1 files changed, 120 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_sysctl.c b/sys/compat/linux/linux_sysctl.c
new file mode 100644
index 0000000..14c5a6f
--- /dev/null
+++ b/sys/compat/linux/linux_sysctl.c
@@ -0,0 +1,120 @@
+/*-
+ * Copyright (c) 2001 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "opt_compat.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/sysproto.h>
+
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#include <compat/linux/linux_util.h>
+
+#define	LINUX_CTL_KERN		1
+#define	LINUX_CTL_VM		2
+#define	LINUX_CTL_NET		3
+#define	LINUX_CTL_PROC		4
+#define	LINUX_CTL_FS		5
+#define	LINUX_CTL_DEBUG		6
+#define	LINUX_CTL_DEV		7
+#define	LINUX_CTL_BUS		8
+
+/* CTL_KERN names */
+#define	LINUX_KERN_OSTYPE	1
+#define	LINUX_KERN_OSRELEASE	2
+#define	LINUX_KERN_OSREV	3
+#define	LINUX_KERN_VERSION	4
+
+static int
+handle_string(struct l___sysctl_args *la, char *value)
+{
+	int error;
+
+	if (la->oldval != NULL) {
+		l_int len = strlen(value);
+		error = copyout(value, la->oldval, len + 1);
+		if (!error && la->oldlenp != NULL)
+			error = copyout(&len, la->oldlenp, sizeof(len));
+		if (error)
+			return (error);
+	}
+
+	if (la->newval != NULL)
+		return (ENOTDIR);
+
+	return (0);
+}
+
+int
+linux_sysctl(struct proc *p, struct linux_sysctl_args *args)
+{
+	struct l___sysctl_args la;
+	l_int *mib;
+	int error, i;
+	caddr_t sg;
+
+	error = copyin((caddr_t)args->args, &la, sizeof(la));
+	if (error)
+		return (error);
+
+	if (la.nlen == 0 || la.nlen > LINUX_CTL_MAXNAME)
+		return (ENOTDIR);
+
+	sg = stackgap_init();
+	mib = stackgap_alloc(&sg, la.nlen * sizeof(l_int));
+	error = copyin(la.name, mib, la.nlen * sizeof(l_int));
+	if (error)
+		return (error);
+
+	switch (mib[0]) {
+	case LINUX_CTL_KERN:
+		if (la.nlen < 2)
+			break;
+
+		switch (mib[1]) {
+		case LINUX_KERN_VERSION:
+			return (handle_string(&la, version));
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	printf("linux: sysctl: unhandled name=");
+	for (i = 0; i < la.nlen; i++)
+		printf("%c%d", (i) ? ',' : '{', mib[i]);
+	printf("}\n");
+
+	return (ENOTDIR);
+}