Move the mkioctls script to libsysdecode and use it to generate a

sysdecode_ioctlname() function.  This function matches the behavior
of the truss variant in that it returns a pointer to a string description
for known ioctls.  The caller is responsible for displaying unknown
ioctl requests.  For kdump this meant moving the logic to handle unknown
ioctl requests out of the generated function and into an ioctlname()
function in kdump.c instead.

Differential Revision:	https://reviews.freebsd.org/D4610

lib/libsysdecode/Makefile

@@ -4,10 +4,31 @@
 
 LIB=	sysdecode
 
-SRCS=	utrace.c
+SRCS=	ioctl.c utrace.c
 INCS=	sysdecode.h
 
 MAN+=	sysdecode.3 \
+	sysdecode_ioctlname.3 \
 	sysdecode_utrace.3
 
+CLEANFILES= ioctl.c
+
+.if defined(COMPAT_32BIT)
+CPP+=	-m32
+.endif
+
+.if ${MK_PF} != "no"
+CFLAGS+=-DPF
+.endif
+
+# Workaround duplicate declarations in <netinet/ip_compat.h>
+CFLAGS.gcc.ioctl.c+= -Wno-redundant-decls
+CFLAGS.gcc+=	${CFLAGS.gcc.${.IMPSRC}}
+
+ioctl.c: mkioctls
+	env MACHINE=${MACHINE} CPP="${CPP}" \
+		/bin/sh ${.CURDIR}/mkioctls ${DESTDIR}${INCLUDEDIR} > ${.TARGET}
+
+beforedepend: ioctl.c
+
 .include <bsd.lib.mk>

lib/libsysdecode/mkioctls

@@ -1,19 +1,15 @@
 #!/bin/sh
 #
 # $FreeBSD$
-#
-# When editing this script, keep in mind that truss also uses it.
-#
 
 set -e
 
-if [ $# -ne 2 -o \( $1 != "print" -a $1 != "return" \) ]; then
-	echo "usage: sh $0 print|return include-dir"
+if [ $# -ne 1 ]; then
+	echo "usage: sh $0 include-dir"
 	exit 1
 fi
 
-style="$1"
-includedir="$2"
+includedir="$1"
 
 LC_ALL=C; export LC_ALL
 
@@ -40,7 +36,7 @@ esac
 
 awk -v x="$ioctl_includes" 'BEGIN {print x}' |
 	$CPP -nostdinc -I$includedir -dM -DCOMPAT_43TTY - |
-	awk -v ioctl_includes="$ioctl_includes" -v style="$style" '
+	awk -v ioctl_includes="$ioctl_includes" '
 BEGIN {
 	print "/* XXX obnoxious prerequisites. */"
 	print "#define COMPAT_43"
@@ -68,20 +64,12 @@ BEGIN {
 	print "#include <cam/cam.h>"
 	print "#include <stddef.h>"
 	print "#include <stdint.h>"
+	print "#include <sysdecode.h>"
 	print ""
 	print ioctl_includes
 	print ""
-	if (style == "print") {
-		print "void ioctlname(unsigned long val, int decimal);"
-		print ""
-		print "void"
-		print "ioctlname(unsigned long val, int decimal)"
-	} else {
-		print "const char *ioctlname(unsigned long val);"
-		print ""
-		print "const char *"
-		print "ioctlname(unsigned long val)"
-	}
+	print "const char *"
+	print "sysdecode_ioctlname(unsigned long val)"
 	print "{"
 	print "\tconst char *str = NULL;"
 	print ""
@@ -103,16 +91,7 @@ BEGIN {
 }
 END {
 	print ""
-	if (style == "print") {
-		print "\tif (str != NULL)"
-		print "\t\tprintf(\"%s\", str);"
-		print "\telse if (decimal)"
-		print "\t\tprintf(\"%lu\", val);"
-		print "\telse"
-		print "\t\tprintf(\"%#lx\", val);"
-	} else {
-		print "\treturn (str);"
-	}
+	print "\treturn (str);"
 	print "}"
 }
 '

lib/libsysdecode/sysdecode.3

@@ -39,6 +39,7 @@ The
 library includes several functions that provide descriptive names of
 values associated with system calls.
 .Sh SEE ALSO
+.Xr sysdecode_ioctlname 3 ,
 .Xr sysdecode_utrace 3
 .Sh HISTORY
 The

lib/libsysdecode/sysdecode.h

@@ -29,6 +29,7 @@
 #ifndef __SYSDECODE_H__
 #define	__SYSDECODE_H__
 
+const char *sysdecode_ioctlname(unsigned long _val);
 int	sysdecode_utrace(FILE *_fp, void *_buf, size_t _len);
 
 #endif /* !__SYSDECODE_H__ */

lib/libsysdecode/sysdecode_ioctlname.3

@@ -0,0 +1,57 @@
+.\"
+.\" Copyright (c) 2015 John 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 12, 2015
+.Dt sysdecode_ioctlname 3
+.Os
+.Sh NAME
+.Nm sysdecode_ioctlname
+.Nd lookup name of device control command
+.Sh LIBRARY
+.Lb libsysdecode
+.Sh SYNOPSIS
+.Ft conts char *
+.Fn sysdecode_ioctlname "unsigned long request"
+.Sh DESCRIPTION
+The
+.Fn sysdecode_ioctlname
+function returns the name of a device control request identified by
+.Fa request .
+A table of names is generated during the build of the
+.Nm sysdecode
+library from system headers that maps device control request values to
+the name of the corresponding C macro.
+.Sh RETURN VALUES
+The
+.Fn sysdecode_ioctlname
+function returns the name of a device control request if
+.Fa request
+is a known value;
+otherwise
+.Dv NULL .
+.Sh SEE ALSO
+.Xr sysdecode 3

usr.bin/kdump/Makefile

@@ -6,7 +6,7 @@
 .PATH: ${.CURDIR}/../ktrace
 
 PROG=		kdump
-SRCS=		kdump_subr.c kdump_subr.h kdump.c ioctl.c subr.c
+SRCS=		kdump_subr.c kdump_subr.h kdump.c subr.c
 CFLAGS+=	-I${.CURDIR}/../ktrace -I${.CURDIR} -I${.CURDIR}/../.. -I.
 
 LIBADD=		sysdecode
@@ -15,15 +15,9 @@ LIBADD+=	capsicum
 CFLAGS+=-DHAVE_LIBCAPSICUM
 .endif
 
-.if ${MK_PF} != "no"
-CFLAGS+=-DPF
-.endif
-
 NO_WERROR?=	YES
 
-CLEANFILES=	ioctl.c kdump_subr.c kdump_subr.h
-
-beforedepend: ioctl.c
+CLEANFILES=	kdump_subr.c kdump_subr.h
 
 .if (${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386")
 beforedepend: linux_syscalls.c
@@ -44,10 +38,6 @@ linux32_syscalls.c: linux32_syscalls.conf
 	    ${.CURDIR}/../../sys/${MACHINE_ARCH}/linux32/syscalls.master ${.CURDIR}/linux32_syscalls.conf
 .endif
 
-ioctl.c: mkioctls
-	env MACHINE=${MACHINE} CPP="${CPP}" \
-	    sh ${.CURDIR}/mkioctls print ${DESTDIR}${INCLUDEDIR} > ${.TARGET}
-
 kdump_subr.h: mksubr
 	sh ${.CURDIR}/mksubr ${DESTDIR}${INCLUDEDIR} | \
 	    sed -n 's/^\([a-z].*)\)$$/void \1;/p' >${.TARGET}

usr.bin/kdump/kdump.c

@@ -116,7 +116,6 @@ void ktrfault(struct ktr_fault *);
 void ktrfaultend(struct ktr_faultend *);
 void limitfd(int fd);
 void usage(void);
-void ioctlname(unsigned long, int);
 
 #define	TIMESTAMP_NONE		0x0
 #define	TIMESTAMP_ABSOLUTE	0x1
@@ -693,6 +692,20 @@ dumpheader(struct ktr_header *kth)
 #undef KTRACE
 int nsyscalls = sizeof (syscallnames) / sizeof (syscallnames[0]);
 
+static void
+ioctlname(unsigned long val)
+{
+	const char *str;
+
+	str = sysdecode_ioctlname(val);
+	if (str != NULL)
+		printf("%s", str);
+	else if (decimal)
+		printf("%lu", val);
+	else
+		printf("%#lx", val);
+}
+
 void
 ktrsyscall(struct ktr_syscall *ktr, u_int flags)
 {
@@ -741,7 +754,7 @@ ktrsyscall(struct ktr_syscall *ktr, u_int flags)
 			case SYS_ioctl: {
 				print_number(ip, narg, c);
 				putchar(c);
-				ioctlname(*ip, decimal);
+				ioctlname(*ip);
 				c = ',';
 				ip++;
 				narg--;

usr.bin/truss/Makefile

@@ -2,16 +2,11 @@
 
 NO_WERROR=
 PROG=	truss
-SRCS=	cloudabi.c ioctl.c main.c setup.c syscalls.c
+SRCS=	cloudabi.c main.c setup.c syscalls.c
 
 LIBADD=	sysdecode
 
 CFLAGS+= -I${.CURDIR} -I. -I${.CURDIR}/../../sys
-CLEANFILES= ioctl.c
-
-ioctl.c: ${.CURDIR}/../kdump/mkioctls
-	env MACHINE=${MACHINE} CPP="${CPP}" \
-		/bin/sh ${.CURDIR}/../kdump/mkioctls return ${DESTDIR}${INCLUDEDIR} > ${.TARGET}
 
 # Define where to generate syscalls for each ABI.
 ABI_SYSPATH.freebsd=		sys/kern

usr.bin/truss/syscalls.c

@@ -1315,7 +1315,7 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 		unsigned long cmd;
 
 		cmd = args[sc->offset];
-		temp = ioctlname(cmd);
+		temp = sysdecode_ioctlname(cmd);
 		if (temp)
 			fputs(temp, fp);
 		else {