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From: b4@gewt.net (Cory Smelosky)
Subject: [TUHS] Mach for i386 / Mt Xinu or other
Date: Tue, 21 Feb 2017 08:38:49 -0800	[thread overview]
Message-ID: <58AC6D19.9010100@gewt.net> (raw)
In-Reply-To: <094c861a-e7ef-3e79-9d70-ada7e579d127@aueb.gr>

Diomidis Spinellis wrote:
> On 21/02/2017 17:18, Joerg Schilling wrote:
>>> Requiring "pass through SCSI" for a CD burner violates the UNIX
>>> philosophy that everything is a file (which implies that reading and
>>> writing data be implemented, where possible, through the read and write
>>> system calls rather than through special interfaces specific to a device
>>> type).
>>
>> You are incorrectly informed:
>>
>> Writing CDs is a highly complex task. No known kernel is able to do that
>> internally.
>>
>> So the only useful method is to use SCSI pass through.
>
> This is an interesting point. However, controlling the C/A/T
> phototypesetter 20 years before writable CD-ROM appeared, was also a
> very complex task, yet it was accomplished through a simple device file.
> Controlling a voice modem is also complex, time-critical, and requires
> bidirectional communication. Again, voice modems were controlled through
> a character device file.

How would you handle the different writing methods? Separate device 
files or an ioctl on a generic device node?

(not arguing - genuinely curious about your theory)

>
> One can envisage a CD-ROM device driver abstracting the commands
> required for writing CD-ROMs into a text-based interface made available
> though a character device. These precedents demonstrate that the SCSI
> pass through was an unneeded architecture-violating shortcut.
>
> Arguably, the same can also be claimed for the networking system calls.
>
> Diomidis
>



  reply	other threads:[~2017-02-21 16:38 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-16  7:28 [TUHS] Mushi and Bagu Rudi Blom
2017-02-16  9:36 ` jsteve
2017-02-16 10:42   ` Nick Downing
2017-02-16 13:49     ` Rudi Blom
2017-02-17 11:30       ` [TUHS] Mach for i386 / Mt Xinu or other jsteve
2017-02-17 14:22         ` Clem Cole
2017-02-17 16:13           ` Chet Ramey
2017-02-17 14:29         ` Clem Cole
2017-02-17 17:23           ` Warner Losh
2017-02-18 22:25           ` Nemo
2017-02-19  6:20             ` jsteve
2017-02-19  7:01               ` Steve Nickolas
2017-02-19 13:46                 ` Jason Stevens
2017-02-19 15:44                   ` Larry McVoy
2017-02-20 18:14                     ` Joerg Schilling
2017-02-20 22:24                       ` Larry McVoy
2017-02-20 23:16                         ` Steve Johnson
2017-02-20 23:18                           ` Larry McVoy
2017-02-20 23:25                             ` Steve Johnson
2017-02-20 23:20                           ` Steve Nickolas
2017-02-21  0:12                             ` Wesley Parish
2017-02-21  1:05                               ` Steve Nickolas
2017-02-21 10:30                         ` Joerg Schilling
2017-02-21 13:47                           ` Random832
2017-02-21 15:18                             ` Joerg Schilling
2017-02-21 15:54                               ` Diomidis Spinellis
2017-02-21 16:38                                 ` Cory Smelosky [this message]
2017-02-21 16:48                                 ` Joerg Schilling
2017-02-21 16:32                               ` Random832
2017-02-21 16:55                                 ` Joerg Schilling
2017-02-21 17:10                                   ` Dan Cross
2017-02-21 19:44                                     ` Joerg Schilling
2017-02-21 21:17                                       ` Dan Cross
2017-02-21 21:37                           ` Larry McVoy
2017-02-22  8:57                             ` jsteve
2017-02-22  9:56                               ` Michael Kjörling
2017-02-22 10:26                                 ` jsteve
2017-02-22 10:29                               ` Joerg Schilling
2017-02-19 21:19               ` Clem Cole
2017-02-20  0:29                 ` Nick Downing
2017-02-20  1:58                   ` Clem Cole
2017-02-20  1:29                 ` Cory Smelosky
2017-02-19 22:59               ` Derek Fawcus
2017-02-17 15:47 Atindra Chaturvedi
2017-02-17 16:55 Noel Chiappa
2017-02-17 20:04 ` Clem Cole
2017-02-19  5:48 Jason Stevens
2017-02-20  6:38 Rudi Blom
2017-02-21  4:16 Doug McIlroy
2017-02-21 12:02 Noel Chiappa
2017-02-21 12:24 ` Steffen Nurpmeso
2017-02-21 12:57   ` Michael Kjörling
2017-02-21 15:02 ` Clem Cole
2017-02-22  1:50   ` Dan Cross
2017-02-22  2:25     ` Steve Nickolas
2017-02-22  3:11     ` Clem Cole
2017-02-22  4:07       ` Dan Cross
2017-02-22  4:17         ` Larry McVoy
2017-02-23 15:31           ` Nemo
2017-02-23 16:00             ` Clem Cole
2017-02-23 16:50               ` Nemo
2017-02-23 22:02               ` Dave Horsfall
2017-02-24  1:30                 ` Clem Cole
2017-02-24 20:54                   ` Dave Horsfall
2017-02-24  1:01               ` Jason Stevens
2017-02-22 10:16       ` jsteve
2017-02-21 15:15 ` Chet Ramey
2017-02-21 16:47 ` Larry McVoy
2017-02-21 18:58   ` Clem Cole
2017-02-21 19:21     ` Larry McVoy
2017-02-21 20:17       ` Clem Cole
2017-02-21 20:28       ` Steve Nickolas
2017-02-21 20:32         ` Larry McVoy
2017-02-21 22:58           ` Wesley Parish
2017-02-22  1:19             ` Clem Cole
2017-02-22  9:00             ` jsteve
2017-02-22  0:52   ` Andy Kosela
2017-02-22  1:04     ` ron minnich
2017-02-22  1:33       ` jason-tuhs
2017-02-22  3:18       ` Larry McVoy
2017-02-22  3:45         ` ron minnich
2017-02-22  4:06           ` Larry McVoy
2017-02-22  4:11             ` Larry McVoy
2017-02-21 16:25 Noel Chiappa
2017-02-21 21:49 Noel Chiappa
2017-02-21 23:10 ` Nick Downing
2017-02-21 23:14 ` Arthur Krewat
2017-02-22  1:22 Rudi Blom
2017-02-22  3:08 ` Cory Smelosky
2017-02-22  3:51 Rudi Blom
2017-02-26 18:33 Norman Wilson
2017-02-28 20:26 ` Dave Horsfall

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