svn commit: r198714 - head/sbin/mknod

[Ed Schouten]

Hello Christian,

* Christian Brueffer <brueffer at FreeBSD.org> wrote:
> The majors file was removed long ago, 0 should be used instead.

It's a bit more complex than that. Right now devices are automatically
numbered, using a 32-bits integer. The following macros are used to
obtain the minor and major numbers (see <sys/types.h>):

| #define major(x)	((int)(((u_int)(x) >> 8)&0xff))	/* major number */
| #define minor(x)	((int)((x)&0xffff00ff))		/* minor number */

This means that a device number above 255 may (or may not) have a
non-zero major number. Just run the following code:

| #include <fcntl.h>
| #include <stdlib.h>
| #include <unistd.h>
| 
| int
| main(int argc, char *argv[])
| {
| 
| 	while (posix_openpt(O_RDWR|O_NOCTTY) >= 0);
| 	sleep(30);
| 	return (0);
| }

On my system it even generates device nodes in /dev/pts with a major
number of 4. I wrote a manpage for these macros some time ago. See
makedev(3).

-- 
 Ed Schouten <ed at 80386.nl>
 WWW: http://80386.nl/
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