obtain minor device number

QNX Newsgroups (Archives) qdn.public.qnxrtp.applications
1

Hi,

In the chapter -" writing a resource manager" of the book- “get started
with qnx neutrino2” , it is said that calling the rsrcdbmgr_devno_attach()
can obtain major and minor device number. However, I couldn’t find it
in the Library Reference. Is there other functions to obtain minor device
number?


Thanks.

2

Belinda <yye@borg.cs.dal.ca> wrote:

Hi,

In the chapter -" writing a resource manager" of the book- “get started
with qnx neutrino2” , it is said that calling the rsrcdbmgr_devno_attach()
can obtain major and minor device number. However, I couldn’t find it
in the Library Reference. Is there other functions to obtain minor device
number?

It is there … I assure you. Perhaps you spelt it wrong
in the search. Look through the contents and you should
see several rsrcdbmgr_* functions. In any case:
rsrcdbmgr_devno_attach()

Get a major and minor number

Synopsis:


#include <sys/rsrcdbmgr.h>
#include <sys/rsrcdbmsg.h>

dev_t rsrcdbmgr_devno_attach( char *name,
int minor_request,
int flags );


Library:

libc

Description:

The function rsrcdbmgr_devno_attach() gets a name major number and
minor_request minor number. You can extract the major and minor number
values from dev_t using the major() and minor() macros defined in
<sys/types.h> (see stat() for descriptions). There’s a maximum of 64
majors and a maximum of 1024 minors.
Presently, there are no flags (flags = 0).

Returns:

A major and minor number. If you specify -1 in minor_request, the
function returns the first free minor number. If an error occurs, the
function returns -1 and sets errno.

Errors:

EINVAL Invalid argument.


Examples:


#include <sys/rsrcdbmgr.h>
#include <sys/rsrcdbmsg.h>

char *dev_name;
int myminor_request, flags=0;
dev_t major_minor;

major_minor = rsrcdbmgr_devno_attach
( dev_name, myminor_request, flags );

…

rsrcdbmgr_devno_detach( major_minor, flags );

Thomas

Thomas (toe-mah) Fletcher QNX Software Systems
thomasf@qnx.com Core OS Technology Group
(613)-591-0931 http://www.qnx.com/

3

Hello Belinda,

The online docs have this information at
http://qdn.qnx.com/support/docs/neutrino_2.11_en/lib_ref/r/rsrcdbmgr_devno_attach.html

Regards,
Dave B.


Belinda wrote:

Hi,

In the chapter -" writing a resource manager" of the book- “get started
with qnx neutrino2” , it is said that calling the rsrcdbmgr_devno_attach()
can obtain major and minor device number. However, I couldn’t find it
in the Library Reference. Is there other functions to obtain minor device
number?


Thanks.