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SubjectRe: ENOIOCTLCMD?
On Sat, May 12, 2001 at 12:16:09PM +0100, Alan Cox wrote:
> > Can somebody explain the use of ENOIOCTLCMD? There are order of 170
> > uses in the kernel, but I don't see any guidelines for that use (nor
> > what prevents it from being seen by user programs).
>
> It should never be seen by apps. If it can be then it is wrong code.
> Basically you use it in things like
>
>
>
> int err = dev->ioctlfunc(dev, op, arg);
> if( err != -ENOIOCTLCMD)
> return err;
>
> /* Driver specific code does not support this ioctl */

I noticed this return coming out of the watchdog driver a
while ago when I was playing with it. I have taken a quick
look and it seems a few drivers do return this directly to
userspace. I'm not sure if this is complete but ...

diff -ur linux-2.4.4-ac8/drivers/block/swim3.c linux/drivers/block/swim3.c
--- linux-2.4.4-ac8/drivers/block/swim3.c Sat May 12 14:59:44 2001
+++ linux/drivers/block/swim3.c Sat May 12 15:22:30 2001
@@ -848,7 +848,7 @@
sizeof(struct floppy_struct));
return err;
}
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}

static int floppy_open(struct inode *inode, struct file *filp)
diff -ur linux-2.4.4-ac8/drivers/block/swim_iop.c linux/drivers/block/swim_iop.c
--- linux-2.4.4-ac8/drivers/block/swim_iop.c Wed Feb 16 10:56:45 2000
+++ linux/drivers/block/swim_iop.c Sat May 12 15:23:12 2001
@@ -363,7 +363,7 @@
sizeof(struct floppy_struct));
return err;
}
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}

static int floppy_open(struct inode *inode, struct file *filp)
diff -ur linux-2.4.4-ac8/drivers/char/acquirewdt.c linux/drivers/char/acquirewdt.c
--- linux-2.4.4-ac8/drivers/char/acquirewdt.c Fri Feb 9 11:30:22 2001
+++ linux/drivers/char/acquirewdt.c Sat May 12 15:14:49 2001
@@ -110,7 +110,7 @@
break;

default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}
return 0;
}
diff -ur linux-2.4.4-ac8/drivers/char/advantechwdt.c linux/drivers/char/advantechwdt.c
--- linux-2.4.4-ac8/drivers/char/advantechwdt.c Tue Mar 6 19:44:34 2001
+++ linux/drivers/char/advantechwdt.c Sat May 12 15:15:58 2001
@@ -120,7 +120,7 @@
break;

default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}
return 0;
}
diff -ur linux-2.4.4-ac8/drivers/char/i810-tco.c linux/drivers/char/i810-tco.c
--- linux-2.4.4-ac8/drivers/char/i810-tco.c Fri Dec 29 14:35:47 2000
+++ linux/drivers/char/i810-tco.c Sat May 12 15:02:47 2001
@@ -213,7 +213,7 @@
};
switch (cmd) {
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
if (copy_to_user
((struct watchdog_info *) arg, &ident, sizeof (ident)))
diff -ur linux-2.4.4-ac8/drivers/char/machzwd.c linux/drivers/char/machzwd.c
--- linux-2.4.4-ac8/drivers/char/machzwd.c Thu Apr 12 12:16:35 2001
+++ linux/drivers/char/machzwd.c Sat May 12 15:09:42 2001
@@ -357,7 +357,7 @@
break;

default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}

return 0;
diff -ur linux-2.4.4-ac8/drivers/char/mixcomwd.c linux/drivers/char/mixcomwd.c
--- linux-2.4.4-ac8/drivers/char/mixcomwd.c Sun Dec 3 17:45:21 2000
+++ linux/drivers/char/mixcomwd.c Sat May 12 15:15:18 2001
@@ -165,7 +165,7 @@
mixcomwd_ping();
break;
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}
return 0;
}
diff -ur linux-2.4.4-ac8/drivers/char/pc110pad.c linux/drivers/char/pc110pad.c
--- linux-2.4.4-ac8/drivers/char/pc110pad.c Sun Feb 4 10:05:29 2001
+++ linux/drivers/char/pc110pad.c Sat May 12 15:13:26 2001
@@ -766,7 +766,7 @@
current_params.tap_interval = new.tap_interval;
return 0;
}
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}


diff -ur linux-2.4.4-ac8/drivers/char/pcwd.c linux/drivers/char/pcwd.c
--- linux-2.4.4-ac8/drivers/char/pcwd.c Fri Apr 6 10:42:55 2001
+++ linux/drivers/char/pcwd.c Sat May 12 15:03:07 2001
@@ -247,7 +247,7 @@

switch(cmd) {
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;

case WDIOC_GETSUPPORT:
i = copy_to_user((void*)arg, &ident, sizeof(ident));
diff -ur linux-2.4.4-ac8/drivers/char/sbc60xxwdt.c linux/drivers/char/sbc60xxwdt.c
--- linux-2.4.4-ac8/drivers/char/sbc60xxwdt.c Fri Feb 9 11:30:22 2001
+++ linux/drivers/char/sbc60xxwdt.c Sat May 12 15:10:46 2001
@@ -241,7 +241,7 @@
switch(cmd)
{
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
case WDIOC_KEEPALIVE:
diff -ur linux-2.4.4-ac8/drivers/char/softdog.c linux/drivers/char/softdog.c
--- linux-2.4.4-ac8/drivers/char/softdog.c Tue Feb 13 14:13:43 2001
+++ linux/drivers/char/softdog.c Sat May 12 15:00:53 2001
@@ -132,7 +132,7 @@
};
switch (cmd) {
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
return -EFAULT;
diff -ur linux-2.4.4-ac8/drivers/char/wdt.c linux/drivers/char/wdt.c
--- linux-2.4.4-ac8/drivers/char/wdt.c Fri Feb 9 11:30:22 2001
+++ linux/drivers/char/wdt.c Sat May 12 15:06:40 2001
@@ -311,7 +311,7 @@
switch(cmd)
{
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;

diff -ur linux-2.4.4-ac8/drivers/char/wdt285.c linux/drivers/char/wdt285.c
--- linux-2.4.4-ac8/drivers/char/wdt285.c Mon Oct 16 12:58:51 2000
+++ linux/drivers/char/wdt285.c Sat May 12 15:00:53 2001
@@ -136,7 +136,7 @@
switch(cmd)
{
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
i = verify_area(VERIFY_WRITE, (void*) arg, sizeof(struct watchdog_info));
if (i)
diff -ur linux-2.4.4-ac8/drivers/char/wdt_pci.c linux/drivers/char/wdt_pci.c
--- linux-2.4.4-ac8/drivers/char/wdt_pci.c Fri Feb 9 11:30:22 2001
+++ linux/drivers/char/wdt_pci.c Sat May 12 15:00:53 2001
@@ -327,7 +327,7 @@
switch(cmd)
{
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;


--
Shane Wegner: shane@cm.nu
http://www.cm.nu/~shane/
PGP: 1024D/FFE3035D
A0ED DAC4 77EC D674 5487
5B5C 4F89 9A4E FFE3 035D
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