i'm guessing there's no way to do this but, if you list the file
/proc/devices, you see only the character and block devices and the
major number corresponding to them:
Character devices:
1 mem
4 /dev/vc/0
4 tty
4 ttyS
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
14 sound
21 sg
29 fb
... etc etc ...
is there any way, from user space, to see the *minor* number region
corresponding to those entries? by way of explanation, in
fs/char_dev.c, you have the structure:
static struct char_device_struct {
struct char_device_struct *next;
unsigned int major;
unsigned int baseminor;
int minorct;
char name[64];
struct cdev *cdev; /* will die */
} *chrdevs[CHRDEV_MAJOR_HASH_SIZE];
so each structure clearly stores the "baseminor" and the "minorct".
but when it comes to print to the /proc/devices file, we read:
void chrdev_show(struct seq_file *f, off_t offset)
{
struct char_device_struct *cd;
if (offset < CHRDEV_MAJOR_HASH_SIZE) {
mutex_lock(&chrdevs_lock);
for (cd = chrdevs[offset]; cd; cd = cd->next)
seq_printf(f, "%3d %s\n", cd->major, cd->name);
mutex_unlock(&chrdevs_lock);
}
}
which displays only the major number and the name. is there any way
to easily get the rest of that information? is it displayed
elsewhere, possibly under /sys?
rday
--
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Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
Twitter: http://twitter.com/rpjday
"Kernel Newbie Corner" column @ linux.com: http://cli.gs/WG6WYX
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