[9fans] lib9p

[9fans] lib9p

[YAMANASHI Takeshi]

I'm building a file server program on lib9p.

On providing the client read function, is it OK that the parent
process forks off a child and returns imediately, while the
child calls the respond() funtion after having done blocking
read() or something?  I'm concerning about the variable
'long *count' passed to srv->read() function for the sake of
returning the count of bytes.

I found srv() is calling the client read function as
	srv->read(r, r->fid, r->rbuf, &r->fcall.count, r->fcall.offset);
in /sys/src/lib9p/srv.c and doesn't care '*count' at all
after that.

So I think it's OK for the present.  But can I rely on it?
--
Sincerely,
YAMANASHI Takeshi

Re: [9fans] lib9p

[David Rubin]

okamoto@granite.cias.osakafu-u.ac.jp wrote:

> 'fuga' may come from Sebastian Bach!!!  :-)

...formally of Skid Row. He's playing in The Rocky Horror Show on
Broadway. If you can get backstage, you can ask him yourself :-)

	david

--
If 91 were prime, it would be a counterexample to your conjecture.
    -- Bruce Wheeler

Re: [9fans] lib9p

[okamoto]

>such a thing, hoge, fuga, honyarara, hogege, etc, etc.

I seem to get right of the origin honyarara...
'fuga' may come from Sebastian Bach!!!  :-)

Kenji

Re: [9fans] lib9p

[YAMANASHI Takeshi]

> I often see this usage of 'hoge' in Japanese BBS.   Do you know the
> origin of that word?   I can't image it. ^_^

Don't know the origin, but I remeber my supervisor
TADA Yoshikatsu, Assistant Professor used a lot of
such a thing, hoge, fuga, honyarara, hogege, etc, etc.
--
YAMANASHI Takeshi

Re: [9fans] lib9p

[okamoto]

>I often use "hoge" as a japanese substituion for

I often see this usage of 'hoge' in Japanese BBS.   Do you know the
origin of that word?   I can't image it. ^_^

Kenji

Re: [9fans] lib9p

[YAMANASHI Takeshi]

> What is "hoge" in srvread?

I often use "hoge" as a japanese substituion for
"foo", "bar" or such.  It seems easier to type
than foo, for me, at least. :)
--
YAMANASHI Takeshi

Re: [9fans] lib9p

[David Rubin]

YAMANASHI Takeshi wrote:

>         term% hget http://bata.cc.titech.ac.jp/uncover/liking/plan9/cursehide.tgz | gunzip | tar x

What is "hoge" in srvread?

	david

--
If 91 were prime, it would be a counterexample to your conjecture.
    -- Bruce Wheeler

Re: [9fans] lib9p

[YAMANASHI Takeshi]

Hi.

> After you
> respond to a flush request you have to make sure that
> r->oldreq will never get responded to.

I agree.  I'm pondering whether to make the parent to
kill the appropriate child in srv->flush(), or to make
the child to check validity of a Req *req before
calling respond(). Hmmm.
--
YAMANASHI Takeshi

Re: [9fans] lib9p

[Russ Cox]

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> When a program (acme in the above example) exits,
> the server fails on the assertion:
> 	assert failed: r == nr
> in lib9p.  I think I must make sure that 'Req *req'
> is valid before the child process calls respond().

See the discussion of flush in the man page.  After you
respond to a flush request you have to make sure that
r->oldreq will never get responded to.

Russ

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From: YAMANASHI Takeshi <uncover@beat.cc.titech.ac.jp>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] lib9p
Date: Tue, 18 Dec 2001 17:17:11 +0900
Message-ID: <12942.1008663431@beat.cc.titech.ac.jp>

From: "Russ Cox" <rsc@plan9.bell-labs.com>
> Sure, that's okay.

I got assured.

Now that I've finished my first Plan 9 file server,
I would like to let it go to the list.

try:
	term% hget http://bata.cc.titech.ac.jp/uncover/liking/plan9/cursehide.tgz | gunzip | tar x
	term% cd cursehide; mk install
	term% cursehide; acme

This server serves /dev/^(mouse cons cursor), hides the
mouse cursor on a keyboard input, and shows it again on
a mouse movement.

KNOWN BUG:
 When a program (acme in the above example) exits,
the server fails on the assertion:
	assert failed: r == nr
in lib9p.  I think I must make sure that 'Req *req'
is valid before the child process calls respond().
--
Sincerely,
YAMANASHI Takeshi

Re: [9fans] lib9p

[YAMANASHI Takeshi]

From: "Russ Cox" <rsc@plan9.bell-labs.com>
> Sure, that's okay.

I got assured.

Now that I've finished my first Plan 9 file server,
I would like to let it go to the list.

try:
	term% hget http://bata.cc.titech.ac.jp/uncover/liking/plan9/cursehide.tgz | gunzip | tar x
	term% cd cursehide; mk install
	term% cursehide; acme

This server serves /dev/^(mouse cons cursor), hides the
mouse cursor on a keyboard input, and shows it again on
a mouse movement.

KNOWN BUG:
 When a program (acme in the above example) exits,
the server fails on the assertion:
	assert failed: r == nr
in lib9p.  I think I must make sure that 'Req *req'
is valid before the child process calls respond().
--
Sincerely,
YAMANASHI Takeshi

Re: [9fans] lib9p

[Russ Cox]

Sure, that's okay.  It does care about count
afterward: the Req r sticks around until you call
respond, at which point r->fcall.count gets used
in the response.

Russ