Add a tool to decode ioctl commands.

One or more ioctl command values can be passed as arguments on the command
line.  For each value, the command is broken down into it's components
(direction, group, number, and length).  In addition, if a command has a
known name it is output via sysdecode_ioctlname().

Reviewed by:	kib, emaste, avg
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D6851

2 files changed, 104 insertions, 0 deletions

diff --git a/tools/tools/decioctl/Makefile b/tools/tools/decioctl/Makefile
new file mode 100644
index 0000000..55aa785
--- /dev/null
+++ b/tools/tools/decioctl/Makefile
@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+PROG=	decioctl
+SRCS=	decioctl.c
+MAN=
+BINDIR?= /usr/bin
+
+LIBADD=	sysdecode
+
+.include <bsd.prog.mk>
diff --git a/tools/tools/decioctl/decioctl.c b/tools/tools/decioctl/decioctl.c
new file mode 100644
index 0000000..3b0e20f
--- /dev/null
+++ b/tools/tools/decioctl/decioctl.c
@@ -0,0 +1,94 @@
+/*-
+ * Copyright (c) 2005-2006,2016 John H. Baldwin <jhb@FreeBSD.org>
+ * 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.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/ioccom.h>
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysdecode.h>
+
+static void
+usage(char **av)
+{
+	fprintf(stderr, "%s: <ioctl> [ ... ]\n", av[0]);
+	exit(1);
+}
+
+int
+main(int ac, char **av)
+{
+	unsigned long cmd;
+	const char *name;
+	char *cp;
+	int group, i;
+
+	if (ac < 2)
+		usage(av);
+	printf("  command :  dir  group num  len name\n");
+	for (i = 1; i < ac; i++) {
+		errno = 0;
+		cmd = strtoul(av[i], &cp, 0);
+		if (*cp != '\0' || errno != 0) {
+			fprintf(stderr, "Invalid integer: %s\n", av[i]);
+			usage(av);
+		}
+		printf("0x%08lx: ", cmd);
+		switch (cmd & IOC_DIRMASK) {
+		case IOC_VOID:
+			printf("VOID ");
+			break;
+		case IOC_OUT:
+			printf("OUT  ");
+			break;
+		case IOC_IN:
+			printf("IN   ");
+			break;
+		case IOC_INOUT:
+			printf("INOUT");
+			break;
+		default:
+			printf("%01lx ???", (cmd & IOC_DIRMASK) >> 29);
+			break;
+		}
+		printf(" ");
+		group = IOCGROUP(cmd);
+		if (isprint(group))
+			printf(" '%c' ", group);
+		else
+			printf(" 0x%02x", group);
+		printf(" %3lu %4lu", cmd & 0xff, IOCPARM_LEN(cmd));
+		name = sysdecode_ioctlname(cmd);
+		if (name != NULL)
+			printf(" %s", name);
+		printf("\n");
+	}
+	return (0);
+}