ioctl: assume that all ioctl commands have unsigned int type

In linux, ioctl command number has a 32-bit unsigned integer type:
	fs/ioctl.c:SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
If the kernel completely ignores other bits on 64-bit architectures,
why should strace care?
Let's follow the kernel and treat it as unsigned int.

* defs.h (struct_ioctlent): Change "code" type to "unsigned int".
(ioctl_decode, ioctl_lookup, block_ioctl, loop_ioctl, mtd_ioctl,
ubi_ioctl, ptp_ioctl, scsi_ioctl, sock_ioctl, term_ioctl, rtc_ioctl,
v4l2_ioctl): Likewise.
* ioctl.c (ioctl_decode, ioctl_lookup, compare, ioctl_next_match):
Likewise.
* block.c (block_ioctl): Likewise.
* loop.c (loop_ioctl): Likewise.
* mtd.c (mtd_ioctl, ubi_ioctl): Likewise.
* ptp.c (ptp_ioctl): Likewise.
* scsi.c (scsi_ioctl): Likewise.
* sock.c (sock_ioctl): Likewise.
* term.c (term_ioctl): Likewise.
* time.c (rtc_ioctl): Likewise.
* v4l2.c (v4l2_ioctl): Likewise.
* ioctlsort.c (struct ioctlent, compare, main): Likewise.

block.c

@@ -103,7 +103,7 @@ print_blkpg_req(struct tcb *tcp, struct blkpg_ioctl_arg *blkpg)
 }
 
 int
-block_ioctl(struct tcb *tcp, long code, long arg)
+block_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	switch (code) {
 	/* take arg as a value, not as a pointer */

defs.h

@@ -396,7 +396,7 @@ typedef struct sysent {
 
 typedef struct ioctlent {
 	const char *symbol;
-	unsigned long code;
+	unsigned int code;
 } struct_ioctlent;
 
 /* Trace Control Block */
@@ -731,20 +731,19 @@ extern void tprint_open_modes(int);
 extern const char *sprint_open_modes(int);
 extern void print_loff_t(struct tcb *, long);
 
-extern const struct_ioctlent *ioctl_lookup(unsigned long);
+extern const struct_ioctlent *ioctl_lookup(const unsigned int);
 extern const struct_ioctlent *ioctl_next_match(const struct_ioctlent *);
-extern int ioctl_decode(struct tcb *, long, long);
-extern int term_ioctl(struct tcb *, long, long);
-extern int sock_ioctl(struct tcb *, long, long);
-extern int proc_ioctl(struct tcb *, int, int);
-extern int rtc_ioctl(struct tcb *, long, long);
-extern int scsi_ioctl(struct tcb *, long, long);
-extern int block_ioctl(struct tcb *, long, long);
-extern int v4l2_ioctl(struct tcb *, unsigned long, long);
-extern int mtd_ioctl(struct tcb *, long, long);
-extern int ubi_ioctl(struct tcb *, long, long);
-extern int loop_ioctl(struct tcb *, long, long);
-extern int ptp_ioctl(struct tcb *, long, long);
+extern int ioctl_decode(struct tcb *, const unsigned int, long);
+extern int block_ioctl(struct tcb *, const unsigned int, long);
+extern int loop_ioctl(struct tcb *, const unsigned int, long);
+extern int mtd_ioctl(struct tcb *, const unsigned int, long);
+extern int ptp_ioctl(struct tcb *, const unsigned int, long);
+extern int rtc_ioctl(struct tcb *, const unsigned int, long);
+extern int scsi_ioctl(struct tcb *, const unsigned int, long);
+extern int sock_ioctl(struct tcb *, const unsigned int, long);
+extern int term_ioctl(struct tcb *, const unsigned int, long);
+extern int ubi_ioctl(struct tcb *, const unsigned int, long);
+extern int v4l2_ioctl(struct tcb *, const unsigned int, long);
 
 extern int tv_nz(const struct timeval *);
 extern int tv_cmp(const struct timeval *, const struct timeval *);

ioctl.c

@@ -34,18 +34,18 @@
 static int
 compare(const void *a, const void *b)
 {
-	unsigned long code1 = (unsigned long) a;
-	unsigned long code2 = ((struct_ioctlent *) b)->code;
+	const unsigned int code1 = (const unsigned long) a;
+	const unsigned int code2 = ((struct_ioctlent *) b)->code;
 	return (code1 > code2) ? 1 : (code1 < code2) ? -1 : 0;
 }
 
 const struct_ioctlent *
-ioctl_lookup(unsigned long code)
+ioctl_lookup(unsigned int code)
 {
 	struct_ioctlent *iop;
 
 	code &= (_IOC_NRMASK<<_IOC_NRSHIFT) | (_IOC_TYPEMASK<<_IOC_TYPESHIFT);
-	iop = bsearch((void*)code, ioctlent,
+	iop = bsearch((const void *) (const unsigned long) code, ioctlent,
 			nioctlents, sizeof(ioctlent[0]), compare);
 	while (iop > ioctlent) {
 		iop--;
@@ -60,9 +60,7 @@ ioctl_lookup(unsigned long code)
 const struct_ioctlent *
 ioctl_next_match(const struct_ioctlent *iop)
 {
-	unsigned long code;
-
-	code = iop->code;
+	const unsigned int code = iop->code;
 	iop++;
 	if (iop < ioctlent + nioctlents && iop->code == code)
 		return iop;
@@ -70,9 +68,9 @@ ioctl_next_match(const struct_ioctlent *iop)
 }
 
 int
-ioctl_decode(struct tcb *tcp, long code, long arg)
+ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
 {
-	switch ((code >> 8) & 0xff) {
+	switch (_IOC_TYPE(code)) {
 #if defined(ALPHA) || defined(POWERPC)
 	case 'f': case 't': case 'T':
 #else /* !ALPHA */

ioctlsort.c

@@ -13,7 +13,7 @@
 struct ioctlent {
 	const char*	header;
 	const char*	name;
-	unsigned long	code;
+	unsigned int	code;
 };
 
 struct ioctlent ioctls[] = {
@@ -23,8 +23,8 @@ struct ioctlent ioctls[] = {
 int nioctls = sizeof(ioctls) / sizeof(ioctls[0]);
 
 int compare(const void* a, const void* b) {
-	unsigned long code1 = ((struct ioctlent *) a)->code;
-	unsigned long code2 = ((struct ioctlent *) b)->code;
+	unsigned int code1 = ((struct ioctlent *) a)->code;
+	unsigned int code2 = ((struct ioctlent *) b)->code;
 	const char *name1 = ((struct ioctlent *) a)->name;
 	const char *name2 = ((struct ioctlent *) b)->name;
 	return (code1 > code2) ? 1 : (code1 < code2) ? -1 : strcmp(name1, name2);
@@ -51,7 +51,7 @@ int main(int argc, char** argv) {
 	for (i = 0; i < nioctls; i++)
 		if (i == 0 || ioctls[i-1].code != ioctls[i].code ||
 		    is_not_prefix(ioctls[i-1].name, ioctls[i].name))
-			printf("\t{\"%s\",\t\"%s\",\t%#06lx},\n",
+			printf("\t{\"%s\",\t\"%s\",\t%#06x},\n",
 				ioctls[i].header, ioctls[i].name, ioctls[i].code);
 
 	return 0;

loop.c

@@ -34,7 +34,8 @@
 #include "xlat/loop_flags_options.h"
 #include "xlat/loop_crypt_type_options.h"
 
-int loop_ioctl(struct tcb *tcp, long code, long arg)
+int
+loop_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	struct loop_info info;
 	struct loop_info64 info64;

mtd.c

@@ -47,7 +47,8 @@
 #include "xlat/mtd_otp_options.h"
 #include "xlat/mtd_nandecc_options.h"
 
-int mtd_ioctl(struct tcb *tcp, long code, long arg)
+int
+mtd_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	struct mtd_info_user minfo;
 	struct erase_info_user einfo;
@@ -252,7 +253,8 @@ int mtd_ioctl(struct tcb *tcp, long code, long arg)
 #include "xlat/ubi_volume_types.h"
 #include "xlat/ubi_volume_props.h"
 
-int ubi_ioctl(struct tcb *tcp, long code, long arg)
+int
+ubi_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	struct ubi_mkvol_req mkvol;
 	struct ubi_rsvol_req rsvol;

ptp.c

@@ -4,7 +4,8 @@
 
 #include "xlat/ptp_flags_options.h"
 
-int ptp_ioctl(struct tcb *tcp, long code, long arg)
+int
+ptp_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	if (!verbose(tcp))
 		return 0;

scsi.c

@@ -103,7 +103,7 @@ print_sg_io_res(struct tcb *tcp, struct sg_io_hdr *sg_io)
 }
 
 int
-scsi_ioctl(struct tcb *tcp, long code, long arg)
+scsi_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	switch (code) {
 	case SG_IO:

sock.c

@@ -52,7 +52,7 @@ print_addr(struct tcb *tcp, long addr, struct ifreq *ifr)
 }
 
 int
-sock_ioctl(struct tcb *tcp, long code, long arg)
+sock_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	struct ifreq ifr;
 	struct ifconf ifc;

term.c

@@ -44,7 +44,8 @@
 #include "xlat/baud_options.h"
 #include "xlat/modem_flags.h"
 
-int term_ioctl(struct tcb *tcp, long code, long arg)
+int
+term_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	struct termios tios;
 	struct termio tio;

time.c

@@ -739,7 +739,7 @@ print_rtc(struct tcb *tcp, const struct rtc_time *rt)
 }
 
 int
-rtc_ioctl(struct tcb *tcp, long code, long arg)
+rtc_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	switch (code) {
 	case RTC_ALM_SET:

v4l2.c

@@ -149,7 +149,7 @@ static void print_v4l2_format_fmt(const struct v4l2_format *f)
 }
 
 int
-v4l2_ioctl(struct tcb *tcp, unsigned long code, long arg)
+v4l2_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 {
 	if (!verbose(tcp))
 		return 0;