[9fans] libc struct Dir field type

[9fans] libc struct Dir field type

[Carsten Kunze]

Hello,

where is the type field of libc struct Dir documented?  In source I found a compare of field type with the char 'M'.  Where can I loop up what 'M' means?

    Carsten

Re: [9fans] libc struct Dir field type

[Charles Forsyth]

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On 19 October 2014 13:30, Carsten Kunze <carsten.kunze@arcor.de> wrote:

> where is the type field of libc struct Dir documented?  In source I found
> a compare of field type with the char 'M'.  Where can I loop up what 'M'
> means?
>


It's the Unicode character used to identify the device driver within a
kernel,
and are part of the device driver's Dev value. Only a few have any sort of
global
significance, and even that's probably a mistake.

cat /dev/drivers
for the map currently in use. /sys/src/9/port/master tries to keep track of
them,
but as you'll see some characters are used for several devices (not in use
simultaneously in the same kernel)

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Re: [9fans] libc struct Dir field type

[Charles Forsyth]

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On 19 October 2014 16:32, Charles Forsyth <charles.forsyth@gmail.com> wrote:

> Only a few have any sort of global
> significance, and even that's probably a mistake.
>

Ignore that: that statement's wrong since they appear in bind operations in
bind(1), bind(2), /lib/namespace and similar contexts.

I also forgot to add that ls -l shows you the type character: ls -l /dev
shows you where different names are produced.

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Re: [9fans] libc struct Dir field type

[Charles Forsyth]

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On 19 October 2014 16:36, Charles Forsyth <charles.forsyth@gmail.com> wrote:

> Only a few have any sort of global
> significance, and even that's probably a mistake.
>

What I really meant was that few programs care about Dir.type since most
don't care what serves the names
as long as they behave as expected. Relatively few programs use the # names
directly in bind(2) calls:
it's more common to set up a name space and then invoke a program.

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Re: [9fans] libc struct Dir field type

[Carsten Kunze]

> On 19 October 2014 16:36, Charles Forsyth <charles.forsyth@gmail.com>
> wrote:
>
> What I really meant was that few programs care about Dir.type since most
> don't care what serves the names
> as long as they behave as expected. Relatively few programs use the # names
> directly in bind(2) calls:
> it's more common to set up a name space and then invoke a program.

Thank you for your in-depth information!

   Carsten