.
Donn Cave, d...@avvanta.com
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it. But not well versed in the intricacies
of the GHC build, so please set me straight if I'm about to waste a lot
of time untangling it in the makefiles.
thanks!
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Quoth John Van Enk vane...@gmail.com,
[... example showing that PortNum is stored in network byte order ]
Notice that using the PortNum constructor does not at all do what the
user expects. This really should be a hidden constructor.
Could you elaborate, what does the user expect?
Quoth Deniz Dogan deniz.a.m.do...@gmail.com,
I have a small program which spawns a subprocess. However, when I hit
C-c, the subprocess won't die, instead it will just keep running until
it's done or until I kill it. I've looked around in System.Process for
something suitable for my needs, but
Quoth siki ga...@karamaan.com,
The actual problem is quite similar to the one that I provided or to the one
in the description of the proposed extension that you linked.
Someone on another forum suggested record functions but I'm not sure I
understood correctly how that would work around
Quoth Alex Queiroz asand...@gmail.com,
Actually some Scheme compilers have a c-declare form that lets
you create C functions, which can be called from C, Haskell, Java,
Ruby etc.
That would be like what you get with Haskell FFI export?
When I do this with nhc98, I need a nhc98 main, and
Quoth Cristiano Paris fr...@theshire.org,
I was a bit surprised by the strong reaction about my citation of
unsafePerformIO.
Well, there might be a couple of things going on here. Part of it is
how to guess the unstated context of a question - I'm fairly sure that
given a more thorough
Quoth br...@lorf.org,
On Tuesday, 14.04.09 at 22:13, Lennart Augustsson wrote:
So the right way to do this (like opening a file), is to try executing
it and let the OS tell you if it failed.
I know, but the various functions that create processes don't help me
know whether the program
Quoth br...@lorf.org,
execute :: FilePath - [String] - IO (Either ExecuteError ExitCode)
where 'ExecuteError' is a data type representing all the ways 'execute'
could fail and that 'execute p args' is supposed to
* ensure p exists
* get p's permissions
* ensure p is readable
* ensure p
Quoth Antoine Latter aslat...@gmail.com,
... I haven't put this into practice yet,
Really? haven't even tried it?
Well, this is just a comment, since I'm not a qualified guru or
anything, but I have been using the foreign array functions to do
some of the things you're doing by hand, which I
Quoth John Lato jwl...@gmail.com,
An exception is caused by some sort of interaction with the run-time
system (frequently a hardware issue). The programmer typically can't
check for these in advance, but can only attempt to recover after
they've happened.
An error is some sort of bug that
Quoth Jonathan Cast jonathancc...@fastmail.fm,
An `error' is any condition where the correct response is for the
programmer to change the source code :)
That's a broad category, that overlaps with conditions where there
are one or more correct responses for the original program as well.
If I
Quoth Henning Thielemann lemm...@henning-thielemann.de,
On Fri, 27 Mar 2009, Donn Cave wrote:
Quoth Jonathan Cast jonathancc...@fastmail.fm,
An `error' is any condition where the correct response is for the
programmer to change the source code :)
That's a broad category, that overlaps
Quoth Duncan Coutts duncan.cou...@worc.ox.ac.uk:
You must not do this. It breaks the semantics of the language.
Other people have given practical reasons why you should not but a
theoretical reason is that you've defined a non-continuous function.
That is impossible in the normal semantics
Quoth Lennart Augustsson lenn...@augustsson.net:
Some examples of what might happen:
OK, these are interesting phenomena. From a practical point of view,
though, I could see someone weighing the potential costs and benefits
of a exception handler outside IO like this, and these effects might
Quoth Jonathan Cast jonathancc...@fastmail.fm:
On Wed, 2009-03-25 at 09:15 -0700, Donn Cave wrote:
OK, these are interesting phenomena. From a practical point of view,
though, I could see someone weighing the potential costs and benefits
of a exception handler outside IO like
Quoth Jonathan Cast jonathancc...@fastmail.fm:
On Wed, 2009-03-25 at 10:00 -0700, Donn Cave wrote:
So I thought it would be interesting to explore statements like you
must not do this, and pure Haskell is not allowed to be
non-deterministic, in terms of practical effects. No one would
make
Manlio -- You may be missing the point of my suggestion, which is to help
people *find* code that suits them, rather than changing anyone's coding
style. Optimizing code for one segment of readers is pessimizing it for
another. Instead of dumbing down the smart code, I'd like to help your
mentioning HOC.
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Quoth Joe Fredette jfred...@gmail.com:
| Hehe, I love it. Sloth is a synonym for Lazyness in English too, and
| they're so freaking cute... :)
... and so freaking slow! :)
Donn
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in
their vocabulary) and arguably better style.
Would you mind presenting the better style argument? To me, the
above could not be clearer, so it seems like the version with fix
could be only as clear, at best.
Thanks,
Donn cave
PS - granted that forever is a fine alternative to either, I
Quoth Neil Mitchell ndmitch...@gmail.com:
Is there a Haskell-Expect module? Something that would allow me to
control an external Unix program via its stdin/stdout/stderr?
System.Process does what you want, I think:
It might not. Expect uses pseudottys (cf. openpty()), and select().
Quoth Robert Greayer robgrea...@yahoo.com:
The Java reinventions largely exist because of the huge deployment-time
benefits you get from pure-Java code (cross-platform portability of
compiled (byte) code, dynamic loading of compiled code over a network,
etc.). Such reinventions are much less
Quoth John A. De Goes j...@n-brain.net:
| Take a language like Ruby or Python (or Java, or C#, etc.). The vast
| majority of code written in these languages does not get down to the
| C level. When I say, vast majority, I'm referring to 99.999%.
| That's because the standard libraries
I tried to build GHC 6.10.1 on NetBSD 4.0 this afternoon, and ran into
an error, where cabal-bin calls the stage2 ghc in utils/installPackage.
pthread_mutex_unlock() is called, evidently from fileLock(), with an
invalid mutex.
NetBSD's pthread implementation differs from Linux in its intolerance
Quoth brian brianchina60...@gmail.com:
| On Fri, Dec 26, 2008 at 1:55 PM, Jeff Heard jefferson.r.he...@gmail.com
wrote:
| Off the top of my head, I would say that the traditional meaning of
| Show could be changed to Serial, where serial encompasses both Read
| and Show -- possibly we could find
Quoth Tim Docker [EMAIL PROTECTED]:
| Hence I seem to need a means of detecting that a socket has been closed
| remotely, without actually reading from it. . Does anyone know how to do
| this? One reference I've found is this:
|
| http://stefan.buettcher.org/cs/conn_closed.html
|
| Apparently
Quoth Duncan Coutts [EMAIL PROTECTED]:
| On Thu, 2008-11-27 at 11:38 -0500, Brandon S. Allbery KF8NH wrote:
|
| The way this is usually handled in the non-threaded case is to either
| use SIGCHLD or non-blocking waitpid() so that green threads can
| continue running. I'm a little surprised
Quoth Maurcio [EMAIL PROTECTED]:
| I have not found examples of this in documentation
| or hackage packages: how can I deal with funcions
| returning not pointers to structs but structs
| thenselves?
|
| struct example {...
|
| example function_name (...
|
| My intuition said I could try a data
Quoth Maurcio [EMAIL PROTECTED]:
| (...) Ironically, that's actually just what the original
| function is doing - cf. struct return convention, where the
| caller allocates space and passes a pointer as a hidden
| parameter. (...)
|
| Can I be sure things always goes like
Quoth Duncan Coutts [EMAIL PROTECTED]:
| On Tue, 2008-11-18 at 11:51 +, Ross Paterson wrote:
| But it could be a reserved word synonymous with \. After all, \ can
| occur in operator symbols, but the operator \ is reserved.
|
| Presumably that would let you do (\ x - ...) but not (\x - )
Quoth Colin Paul Adams [EMAIL PROTECTED]:
| Is there a way to call Haskell code from other languages? I have looked on
| the wiki, and as far as I can see, it only talks about the other way
| round (when Haskell is the main program).
There sure is a way to call from other languages - cf. foreign
the importance of closing the write end of your own pipe,
and not letting pipe fds leak into child processes.
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in this context, then maybe
it isn't such a generally useful language that people ought to be worried
about learning it.
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the arguments, but runCommand [only] invokes the shell.
If you want runProcess to invoke the shell:
runProcess /bin/sh [-c, commandLine] ...
(... ought to be [sh, -c commandLine], but the way I remember it
ghc gratuitously prevents you from specifying argv 0.)
Donn Cave, [EMAIL
! ;-)
Well, to be precise, C++ got that from C. What C++ adds to it:
fy(a.fx(b), c) (in Haskell, fy (fx a b) c)
I wouldn't worry too much about one letter identifiers and so forth.
Many programmers will secretly be rather attracted to this kind of thing.
Donn Cave, [EMAIL PROTECTED
should leave this to the programmer - support
processes, OS threads, or user threads without undue work-around burdens.
Otherwise we'll be stuck like the Python community is, defending this
approach as a religious argument. We have enough of those already.
Donn Cave, [EMAIL PROTECTED
Quoth Philip Weaver [EMAIL PROTECTED]:
| On Fri, Sep 12, 2008 at 5:13 AM, Ian Lynagh [EMAIL PROTECTED] wrote:
| On Mon, Sep 08, 2008 at 10:08:27PM +0200, Thorkil Naur wrote:
|
| take the latest (7.0) FreeBSD and install that.
|
| So, it would be useful to know, which FreeBSD version would you
Prelude.catch and
Control.Exception.catch
Though in an example like that, you'll need to force evaluation to
actually catch the exception.
f _ = return something went wrong
t = return $! show $ too short list !! 100
... Control.Exception.catch t f
(note $! instead of $ in t.)
Donn Cave
when
it isn't in a path automatically searched by the compiler, and
2) NetBSD renamed system functions. (They also include the above
mentioned ELF_ST_TYPE patch.) These patches are applied by the
NetBSD package maintainer, but are also available separately
through the package system.
Donn
strings
to parse.
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to a ByteString or something, would have to think about it.
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Quoth brian [EMAIL PROTECTED]:
| On Fri, Aug 29, 2008 at 11:15 AM, Donn Cave [EMAIL PROTECTED] wrote:
| Quoth brian [EMAIL PROTECTED]:
|
| | I want to use Parsec to parse NNTP data coming to me from a handle I
| | get from connectTo.
|
| I would implement the network service
| input data stream
Quoth Thomas Schilling [EMAIL PROTECTED]:
| ... Haskell can learn from
| O'Caml, O'Caml can learn from Haskell. I also think that most users
| of either language actually know that.
I'd like to start with a name for it.
- Objective CAML (name of the language)
- ocaml (name of the
Quoth John Goerzen [EMAIL PROTECTED]:
...
| One problem with that is that if I use specific parsing library foo,
| then only others that are familiar with specific parsing library foo can
| hack on it.
Well, you asked. For me, the parsing is a relatively minor part of the
problem and maybe not
Quoth John Goerzen [EMAIL PROTECTED]:
| Donn Cave wrote:
...
| So I would let the application come up with the data. In general,
|
| Well, your response here begs the question of how much you want to
| automate from the application. Yes, there are multiple ways of
| communicating with IMAP
case the application gets more
data from the server and tries again.
--
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that the function hopenssl
was looking for is commonly missing in SSL builds.
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On Sat, 07 Jun 2008 05:14:02 +0100
Simon Marlow [EMAIL PROTECTED] wrote:
Donn Cave wrote:
On Thu, 5 Jun 2008 09:23:36 -0700
Donn Cave [EMAIL PROTECTED] wrote:
... It looks like, in base anyway, this actually goes in a .h file,
to a pattern like
... ah, never mind that, I see
On Thu, 5 Jun 2008 09:23:36 -0700
Donn Cave [EMAIL PROTECTED] wrote:
... It looks like, in base anyway, this actually goes in a .h file,
to a pattern like
... ah, never mind that, I see those wrappers are not the sort I need.
--
Donn Cave [EMAIL PROTECTED
On Mon, 02 Jun 2008 09:36:41 +0100
Simon Marlow [EMAIL PROTECTED] wrote:
Donn Cave wrote:
...
20080531 and NetBSD-amd64 4.0, not so good:
GHCi, version 6.8.2.20080531: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
Bad system call (core
work around this problem?
Yes, so the NetBSD package maintainer suggested, after I wrote to him
about this. He expressed some interest in getting the amd64 build into
the package system, as there have been requests (currently supports only
the i386 platform), so I'm going to pursue that.
--
Donn
smoothly.
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On Sat, 10 May 2008 10:35:12 +0100
Emil Skoeldberg [EMAIL PROTECTED] wrote:
On Fri, May 09, 2008 at 10:21:19PM -0700, Donn Cave wrote:
So here I am with 64 bit Athlon hardware, running amd64
NetBSD (a.k.a. x86_64), reasonably motivated to compile
Haskell.
So, we are in the same boat
(), unsetenv(), etc.
So if that's agreeable, don't take the file I put on-line, I'll
build up another one.
thanks
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don't use mmap(), then support for MAP_32BIT is no concern?
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!
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. I will
follow up off list if I get anywhere interesting with it, either
to parties to this exchange or maybe glasgow-haskell-users would
be an appropriate place.
--
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http
/netbsd .hc files from i386/netbsd -- where
there's already a working ghc.
I have ghc 6.4.1 on NetBSD 3.0 i386. That's the idea, right? as
apparently 6.8 is known to not build from .hc files. I don't
understand `with headers starting to diverge'.
Donn Cave, [EMAIL PROTECTED]
--
Donn
files to build 6.6.1 on NetBSD,
and then use 6.6.1 to build 6.8 or whatever the current
version may be by the time I get there?
--
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that
runInteractiveProcess has
an inadequate API, since you can't indicate whether the
interaction with
the other process should happen in text or binary mode.
I don't see any reason to support text mode.
Doesn't hGetLine imply text mode? What does Line mean, otherwise?
Donn Cave
that causes the program to fail mysteriously.
Donn Cave, [EMAIL PROTECTED]
--
import System.Posix.Terminal (TerminalMode(..), TerminalState(..),
withoutMode, getTerminalAttributes, setTerminalAttributes,
openPseudoTerminal
would use error.
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On Apr 16, 2008, at 10:25 AM, Brandon S. Allbery KF8NH wrote:
On Apr 16, 2008, at 13:23 , Miguel Mitrofanov wrote:
You are insulting other Unixes. It works on Mac OS X, for example.
Not just that, but IIRC Linux was late to the party: Solaris got /
dev/fd/ and /dev/stdin before Linux got
to work around the Haskell non-blocking, or the ReadWrite
non-blocking?
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On Mar 18, 2008, at 12:00 PM, Thomas Schilling wrote:
... I think it's worth to try to make it clear that static typing
can help programmers new to the code easily check where things are
used and gives them the confidence that their changes won't
introduce unintended side effects.
It's
be
caught outside IO?
(Of course, I do _not_ propose to write code per the expanded
example above - that's only a partial expansion, and already too
cumbersome to be useful. It's only a conceptual model.)
Donn Cave, [EMAIL PROTECTED]
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On Mar 10, 2008, at 5:48 PM, Jonathan Cast wrote:
On 10 Mar 2008, at 12:37 AM, Donn Cave wrote:
...
An exception is, for me, any state that isn't properly accounted
for in its
immediate context. openFile could return 'Maybe Handle', but it
doesn't,
so the context demands a Handle
On Mar 12, 2008, at 6:34 AM, Brandon S. Allbery KF8NH wrote:
On Mar 11, 2008, at 14:27 , Donn Cave wrote:
readLDAPMessage s = let [(_, msgID), (tag, body)] = berList s in
LDAPMessage (berInt msgID) (readResponse tag body)
I go on to account for all the LDAP stuff I need in about
On Mar 12, 2008, at 12:32 PM, Brandon S. Allbery KF8NH wrote:
On Mar 12, 2008, at 14:17 , Donn Cave wrote:
Sure. It isn't a lot of code, so I subjected it to Either-ization
as an experiment, and I did indeed take the monad procedural route.
Monad != procedural, unless you insist on do
On Mar 12, 2008, at 2:10 PM, Henning Thielemann wrote:
On Wed, 12 Mar 2008, Donn Cave wrote:
On Mar 12, 2008, at 12:32 PM, Brandon S. Allbery KF8NH wrote:
On Mar 12, 2008, at 14:17 , Donn Cave wrote:
Sure. It isn't a lot of code, so I subjected it to Either-ization
as an experiment
carry on regardless, however, so
the implementation shouldn't be sensitive to these philosophical
distinctions.
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the
difference between errors and exceptions, but it doesn't come
across and I don't think it's just me.
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.
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, and was
just a minute short of sending in the FORTRAN Programmer's solution.
It would have really made your eyes burn.
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enjoy puns, and mapped to an A/B form
it seemed obvious that Success is A.
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of these library functions
came from?
For the author of the original post ... can't make out what you actually
found and tried, so you should know about catch in the Prelude, the
basic exception handler.
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anything
about it.
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the functional understanding of Chinese is intelligence or not, but
the man inside is huge, stinking red herring.
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redirection in
the command, script params 21.)
I imagine it would be easy enough to create the pipes to use with
runProcess, but don't know how portable this would be outside the
UNIX / POSIX world.
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of earth by feasting on air and sunlight only.
Donn Cave
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.
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my I/O functions are parameters to the open
or init function, and the IMAP functions take over from there. In a
more pure functional oriented model, could it be an extended API that
exposes the IMAP functionality as operations on data, and leaves it to
me to deal with the I/O?
Donn Cave
control over the wire,
that might give you a thinner API, and fewer problems to solve via typeclass.
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system in its antique way, and UNIX (et al.) is built around
it on
a big scale. It isn't going away.
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hand, erred toward the
permissive/promiscuous, cf. your NetBSD source comparison.)
My source observations may have been ambiguous. Old NetBSD popen
closed all fds, current NetBSD popen closes only popen fds.
Donn Cave, [EMAIL PROTECTED
implementation issue.
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the way to go, if closing fds.
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/date False [] Nothing
tr = executeFile /usr/bin/tr False [[A-Z], [a-z]] Nothing
There's probably a nice way to wrap that up, so you're not keeping
track of the file descriptors for all the pipes.
Donn Cave, [EMAIL PROTECTED]
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On Oct 16, 2007, at 9:52 PM, Brandon S. Allbery KF8NH wrote:
On Oct 17, 2007, at 0:39 , Donn Cave wrote:
...
As for closing file descriptors explicitly - if I remember right
what I've seen
in the NetBSD source, the UNIX popen() implementation may years ago
have closed all file descriptors
.
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to defeat
this
false recognition, that should help a lot.
Or maybe that's good too, for more survivor self selection. Maybe a
good
slogan would be `like LISP, but with strong static typing!'
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.
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the inevitable and handles it well. Monads, the
do syntax, whatever it takes (I have a soft spot for O'Haskell, but
alas I must be nearly alone on that.) Hopefully, it's still better,
and not at all irreconcilable with the Functional Way.
Donn Cave, [EMAIL PROTECTED]
(That's a genuine question
. In
particular, I'm interested in developing GUIs for languages like these. More
specifically, a variation of Mathematica's notebook front-end, designed to
make functional languages more accessible and useful for scientists and
engineers.
Donn Cave, [EMAIL PROTECTED
in sed, but
from what I gather so far, the following awk would do it --
awk '{ if (/~$/) print; else printf %s, $0 }'
(literal separator for legibility.) I know we're not exactly looking
for an awk or sed solution here, but thought it might add some context
to the exercise anyway.
Donn
,
the host virtual memory management should ideally let you get away with
that. And file data will be contiguous and sequential in memory, which
in principle ought to be optimal for memory resources.
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there's a lot less book-keeping
needed if there's nothing to do in the end anyway.
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others to suit particular applications.
Donn Cave, [EMAIL PROTECTED]
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directly
support it, that would probably be just as well.
Well, you asked for comments!
Donn Cave, [EMAIL PROTECTED]
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