From ckeen at pestilenz.org  Fri Feb  4 08:56:38 2022
From: ckeen at pestilenz.org (Christian Kellermann)
Date: Fri, 4 Feb 2022 09:56:38 +0100
Subject: [Newbies] Sending UDP broadcasts
Message-ID: <YfzqRkEIGQwGZs/9@pestilenz.org>

Dear List,

I am trying to send a UDP broadcast on a Linux host with the following code:

```
s := Socket newUDP.

s setOption:  'SO_BROADCAST' value: 1.
[[(Delay forSeconds: numberOfSeconds) wait.
	 s sendUDPData: shoutout toHost: '255.255.255.255' port: (self portNumber) ]
repeat] fork.
```

I always get a Primitive Failed error for the sendUDPData message.
shoutout is a string in this case.

What am I missing for this example?

Versions used are: 

Squeak5.3
latest update: #19470
unix linux-gnu x86_64

Open Smalltalk Cog[Spur] VM [CoInterpreterPrimitives VMMaker.oscog-eem.3142]
Unix built on Feb  4 2022 08:41:04 Compiler: Clang 13.0.0
platform sources revision VM: 202201220125 

Kind regards,

Christian


-- 
May you be peaceful, may you live in safety, may you be free from
suffering, and may you live with ease. Also encrypt mails to me:
gpg key 0x068757350D0328634B833B65C537678F6BC627B5


From ckeen at pestilenz.org  Fri Feb  4 09:10:36 2022
From: ckeen at pestilenz.org (Christian Kellermann)
Date: Fri, 4 Feb 2022 10:10:36 +0100
Subject: [Newbies] Help with FFI
In-Reply-To: <20210210160900.GL41298@pestilenz.org>
References: <20210210160900.GL41298@pestilenz.org>
Message-ID: <YfztjCi+8xwdEA9K@pestilenz.org>

* Christian Kellermann <ckeen at pestilenz.org> [210210 17:09]:
> I want to find my way around the FFI module and how to use it in squeak.
> No let's step back. I want to use a a binding to libsodium form Tony
> (https://www.eighty-twenty.org/2013/06/11/nacl-for-squeak-and-pharo)
> and ended up using the Crypto-Nacl-HernanMoralesDurand.13.mcz package
> as the most recent one from Tony seemed to be Pharo's FFI syntax, as Tobias suggested to me.
> 
> However each of the supplied tests return a 'module not found error' on my
> 64 bit Linux Squeak 5.3+updates with the bundled VM.
> 
> So I tried the Unix examples there and none of those work either, so
> before I dig deeper into this I'd like to get some kind of re-assurance
> of what I should expect to work on this particular setup.
> 
> The FFI Tests from the bundled package all pass though.
> 
> So my questions are:
> 
> 1. Are the Unix FFI examples supposed to work?
> 2. Is the Crypto-Nacl package I want to use recent enough for the FFI?
> 3. Is the documentation in swiki still up to date for squeak 5.3?
> 4. What's the logic for searching and loading the shared object to bind to
>    and where do I have to look in the opensmalltalk-vm code?
 
Dear future C-Keen and archive googlers,

To answer my own question here using my own build opensmalltalk-vm solved the issue, since
the FFI plugin that came with the release bundle did not seem to work.

Kind regards,

Present C-Keen...

-- 
May you be peaceful, may you live in safety, may you be free from
suffering, and may you live with ease. Also encrypt mails to me:
gpg key 0x068757350D0328634B833B65C537678F6BC627B5


From Das.Linux at gmx.de  Fri Feb  4 13:01:48 2022
From: Das.Linux at gmx.de (Tobias Pape)
Date: Fri, 4 Feb 2022 14:01:48 +0100
Subject: [Newbies] Help with FFI
In-Reply-To: <YfztjCi+8xwdEA9K@pestilenz.org>
References: <20210210160900.GL41298@pestilenz.org>
 <YfztjCi+8xwdEA9K@pestilenz.org>
Message-ID: <91E442C3-E38D-404B-BD3A-624289EDC017@gmx.de>

Dear any-time ckeen

> On 4. Feb 2022, at 10:10, Christian Kellermann <ckeen at pestilenz.org> wrote:
> 
> * Christian Kellermann <ckeen at pestilenz.org> [210210 17:09]:
>> I want to find my way around the FFI module and how to use it in squeak.
>> No let's step back. I want to use a a binding to libsodium form Tony
>> (https://www.eighty-twenty.org/2013/06/11/nacl-for-squeak-and-pharo)
>> and ended up using the Crypto-Nacl-HernanMoralesDurand.13.mcz package
>> as the most recent one from Tony seemed to be Pharo's FFI syntax, as Tobias suggested to me.
>> 
>> However each of the supplied tests return a 'module not found error' on my
>> 64 bit Linux Squeak 5.3+updates with the bundled VM.
>> 
>> So I tried the Unix examples there and none of those work either, so
>> before I dig deeper into this I'd like to get some kind of re-assurance
>> of what I should expect to work on this particular setup.
>> 
>> The FFI Tests from the bundled package all pass though.
>> 
>> So my questions are:
>> 
>> 1. Are the Unix FFI examples supposed to work?
>> 2. Is the Crypto-Nacl package I want to use recent enough for the FFI?
>> 3. Is the documentation in swiki still up to date for squeak 5.3?
>> 4. What's the logic for searching and loading the shared object to bind to
>>   and where do I have to look in the opensmalltalk-vm code?
> 
> Dear future C-Keen and archive googlers,
> 
> To answer my own question here using my own build opensmalltalk-vm solved the issue, since
> the FFI plugin that came with the release bundle did not seem to work.

Thanks for the info! and Thanks for sharing, even after this time :D.
Could you share which vm bundled the non-working FFI plugin?
Best regards
	-Tobias

[cc squeak-dev/vm-dev]

From Das.Linux at gmx.de  Fri Feb  4 13:46:36 2022
From: Das.Linux at gmx.de (Tobias Pape)
Date: Fri, 4 Feb 2022 14:46:36 +0100
Subject: [Newbies] Sending UDP broadcasts
In-Reply-To: <YfzqRkEIGQwGZs/9@pestilenz.org>
References: <YfzqRkEIGQwGZs/9@pestilenz.org>
Message-ID: <5FC1775E-C12C-482D-8221-0D0CBA337516@gmx.de>

Hi Christian

> On 4. Feb 2022, at 09:56, Christian Kellermann <ckeen at pestilenz.org> wrote:
> 
> Dear List,
> 
> I am trying to send a UDP broadcast on a Linux host with the following code:
> 
> ```
> s := Socket newUDP.
> 
> s setOption:  'SO_BROADCAST' value: 1.
> [[(Delay forSeconds: numberOfSeconds) wait.
> 	 s sendUDPData: shoutout toHost: '255.255.255.255' port: (self portNumber) ]
> repeat] fork.
> ```
> 
> I always get a Primitive Failed error for the sendUDPData message.
> shoutout is a string in this case.
> 
> What am I missing for this example?

The host is not a string but rather an address. Try this:

```
addr :=  NetNameResolver addressForName: '255.255.255.255' timeout: 10.
s := Socket newUDP.

s setOption:  'SO_BROADCAST' value: 1.
[[(Delay forSeconds: numberOfSeconds) wait.
	 s sendUDPData: shoutout toHost: addr port: (self portNumber) ]
repeat] fork.
```

see also the lone sender of #sendUDPData:toHost:port:  and subsequently 
#sendData:toHost:port: in Socket>>timeTestUDP:

```
"..."
	serverAddr := NetNameResolver addressForName: serverName timeout: 10.
	serverAddr = nil 
		ifTrue: [self error: 'Could not find the address for ' , serverName].
	s := self newUDP.	"a 'random' port number will be allocated by the system"
"..."
	s 
		sendData: '!'
		toHost: serverAddr
		port: 13.	"13 is the daytime service"
	Transcript show: 'the time server reports: ' , s receiveData.
```

Best regards
	-Tobias

> 
> Versions used are: 
> 
> Squeak5.3
> latest update: #19470
> unix linux-gnu x86_64
> 
> Open Smalltalk Cog[Spur] VM [CoInterpreterPrimitives VMMaker.oscog-eem.3142]
> Unix built on Feb  4 2022 08:41:04 Compiler: Clang 13.0.0
> platform sources revision VM: 202201220125 
> 
> Kind regards,
> 
> Christian




From ckeen at pestilenz.org  Fri Feb  4 16:32:03 2022
From: ckeen at pestilenz.org (Christian Kellermann)
Date: Fri, 4 Feb 2022 17:32:03 +0100
Subject: [Newbies] Sending UDP broadcasts
In-Reply-To: <5FC1775E-C12C-482D-8221-0D0CBA337516@gmx.de>
References: <YfzqRkEIGQwGZs/9@pestilenz.org>
 <5FC1775E-C12C-482D-8221-0D0CBA337516@gmx.de>
Message-ID: <Yf1VA5xbFFJZianh@pestilenz.org>

Hey Tobias!

* Tobias Pape <Das.Linux at gmx.de> [220204 14:46]:
> The host is not a string but rather an address. Try this:
> 
> ```
> addr :=  NetNameResolver addressForName: '255.255.255.255' timeout: 10.
> s := Socket newUDP.
> 
> s setOption:  'SO_BROADCAST' value: 1.
> [[(Delay forSeconds: numberOfSeconds) wait.
> 	 s sendUDPData: shoutout toHost: addr port: (self portNumber) ]
> repeat] fork.
> ```

Oh, duh! Yes of course. I stopped at the <prim> call pragma, I should have gone deeper.
I somehow missed the example in the code.

Another error state for invalid parameters might have helped here in general though.

Thanks for your patience explaining all this.

Cheers,

Christian

-- 
May you be peaceful, may you live in safety, may you be free from
suffering, and may you live with ease. Also encrypt mails to me:
gpg key 0x068757350D0328634B833B65C537678F6BC627B5


From Das.Linux at gmx.de  Fri Feb  4 16:54:36 2022
From: Das.Linux at gmx.de (Tobias Pape)
Date: Fri, 4 Feb 2022 17:54:36 +0100
Subject: [Newbies] Sending UDP broadcasts
In-Reply-To: <Yf1VA5xbFFJZianh@pestilenz.org>
References: <YfzqRkEIGQwGZs/9@pestilenz.org>
 <5FC1775E-C12C-482D-8221-0D0CBA337516@gmx.de>
 <Yf1VA5xbFFJZianh@pestilenz.org>
Message-ID: <3FCF68C9-D776-4C3B-8030-51E515E200E9@gmx.de>

Hey

> On 4. Feb 2022, at 17:32, Christian Kellermann <ckeen at pestilenz.org> wrote:
> 
> Hey Tobias!
> 
> * Tobias Pape <Das.Linux at gmx.de> [220204 14:46]:
>> The host is not a string but rather an address. Try this:
>> 
>> ```
>> addr :=  NetNameResolver addressForName: '255.255.255.255' timeout: 10.
>> s := Socket newUDP.
>> 
>> s setOption:  'SO_BROADCAST' value: 1.
>> [[(Delay forSeconds: numberOfSeconds) wait.
>> 	 s sendUDPData: shoutout toHost: addr port: (self portNumber) ]
>> repeat] fork.
>> ```
> 
> Oh, duh! Yes of course. I stopped at the <prim> call pragma, I should have gone deeper.
> I somehow missed the example in the code.

No worries!


> 
> Another error state for invalid parameters might have helped here in general though.

Funnily enough, the primitive does this for all sort of things:
(c code generated from SLANG:
	https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/src/plugins/SocketPlugin/SocketPlugin.c#L2053
) but not the host.
This might be because things changed over time, and, indeed, there used to be a variant to pass
a host in a different manner.

> 
> Thanks for your patience explaining all this.

No, no worries at all.
I actually debugged the VM until i reached here:
	https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/src/plugins/SocketPlugin/SocketPlugin.c#L2108
and, yes, sz was not 4, and yes, primitiveFail should probably be primitiveFailFor(PrimErrBadArgument) 

:D

Best regards
	-Tobias
> 
> Cheers,
> 
> Christian