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246 discussions

[iolib-devel] with-open-socket oddness
by Peter Keller 10 Feb '10

10 Feb '10

Hello, I discovered in my boundary testing of with-open-socket that it sort of has a funny behavior I didn't expect. Basically, I had a top level code like this in a blocking i/o tcp ipv4 client talking to a server: (with-open-socket (socket :stuff :things) ;; set up i/o handlers, each wrap their reads and writes around ;; handler-case. A disconnector on the sockets removes the io handlers, but ;; doesn't close the socket since with-open-socket should do it. (handler-case ;; run forever until empty (meaning we disconnected from the server), ;; then return. (event-dispatch *base*) (hangup () (format t "Hangup while writing to server~%")) (end-of-file () (format t "End of file from server~%")))) Now, what happened was, under certain conditions where there is inflight data on the sockets, a registered handler could get a signaled condition, specifically hangup, that tells me the server went away on a write. This is expected. I disconnect the socket which removes the i/o handlers, which causes event-dispatch to return since there are no registered handlers.... and then bam! The with-open-stream performs a (finish-output) and (close) on the socket and I get _another_ hangup condition! So I had to rewrite the code like this moving the handler-case up one scope: (handler-case (with-open-socket (socket :things :stuff) ;; set up i/o handlers, each wrap their reads and writes around ;; handler-case. A disconnector on the sockets removes the io handlers, but ;; doesn't close the socket since with-open-socket should do it. (event-dispatch *base*)) (hangup () (format t "Hangup while writing to server~%")) (end-of-file () (format t "End of file from server~%")))) Is this a to be expected scenario in condition handling with respect to with-open-socket? Is this idiomatic code? Should the disconnector function close the socket even though with-open-socket also closes it? I'm not sure of the right thing to do here. Thank you. -pete

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[iolib-devel] New collection of unchecked iolib examples
by Peter Keller 01 Feb '10

01 Feb '10

Hello, In case one's curious how to use iolib, here are some unvetted examples on doing TCP/IP blocking I/O with IPV4. The program ex7-server.lisp is incomplete as of yet so ignore that one. This is for a tutorial I'm writing but which is not yet completed. I send this to the list in case I get hit by a bus or something and at least some of what I wrote makes it to the list for future people to learn from. Thank you. -pete

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[iolib-devel] fd handlers
by Peter Keller 01 Feb '10

01 Feb '10

Hello, Is there a means by which a handler registered with set-io-handler can be "deactivated" so that it isn't considered in the fd set being checked and "reactivated" later to be put back into the fd set? I ask because I might not have access to the function which I want associated, say with a write handler, but when the buffer the write handler is writing is empty. If the write handler is always activated on an empty buffer solely because it is in the write handler callback, then that is a performance problem. Thank you. -pete

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[iolib-devel] New patches: 19-Jan-2010
by Stelian Ionescu 20 Jan '10

20 Jan '10

commit bafe0d3f4a561b227387e3c50d6a951aec092b03 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 19 17:50:32 2010 +0100 Fix docstrings src/os/os-unix.lisp | 45 ++++++++++++++++++++++----------------------- 1 files changed, 22 insertions(+), 23 deletions(-) commit 211906763f03bda278a480f6918d6c7eca33649c Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Thu Jan 14 17:42:14 2010 +0100 Signal SUBTYPE-ERROR when a MEMORY-ZSTREAM is initialized with data inconsistent with the specified elementh-type. src/streams/zeta/stream.lisp | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-) commit b6be014d6b2d86080e4e0e4f9253cb993d3d7fb9 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Thu Jan 14 17:09:48 2010 +0100 Fix typo and untabify. src/streams/zeta/stream.lisp | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) commit a93a08d16a86f535dd63d9e331553e3d22ef1092 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Thu Jan 14 17:09:24 2010 +0100 Rename IOLIB.ZETA-STREAMS -> IOLIB.ZSTREAMS src/iolib.zeta-streams.asd | 29 ----------------------------- src/iolib.zstreams.asd | 29 +++++++++++++++++++++++++++++ src/streams/zeta/conditions.lisp | 2 +- src/streams/zeta/device.lisp | 2 +- src/streams/zeta/ffi-functions-unix.lisp | 2 +- src/streams/zeta/file-unix.lisp | 2 +- src/streams/zeta/iobuf.lisp | 2 +- src/streams/zeta/pkgdcl.lisp | 2 +- src/streams/zeta/stream.lisp | 2 +- src/streams/zeta/types.lisp | 2 +- 10 files changed, 37 insertions(+), 37 deletions(-) An updated tarball of IOLib's source can be downloaded here: http://common-lisp.net/project/iolib/files/snapshots/iolib-20100119.tar.gz Gitweb URL: http://repo.or.cz/w/iolib.git

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[iolib-devel] event-dispatch
by Peter Keller 20 Jan '10

20 Jan '10

Hello, Under what conditions does event-dispatch return? For example, if I set up a read and write handler on one fd and through the course of the network protocol, one of the handlers decides to close the connection. If this handler calls remove-fd-handlers for the socket's underlying fd in question, is this sufficient to make event-dispath return? Thanks. -pete

1 1

[iolib-devel] New patches: 13-Jan-2010
by Stelian Ionescu 14 Jan '10

14 Jan '10

commit cf90ef5196f64994be1f6dde7caa455223d280de Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Wed Jan 13 22:05:14 2010 +0100 Fix DELETE-FILES: pass correct closure to WALK-DIRECTORY. Bug spotted by Levente Mészáros. src/os/os-unix.lisp | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) commit 336ed5627fb2d84d819906db72ac1f8a57c2ccc1 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 12 19:02:32 2010 +0100 Use package :iolib.sockets in :iolib.trivial-sockets. src/sockets/trivial-sockets.lisp | 52 +++++++++++++++++++------------------- 1 files changed, 26 insertions(+), 26 deletions(-) commit 70c07b60d33d90885cfe1b5cf2b066be6b3b6e04 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 12 01:48:55 2010 +0100 Delete spurious .gitignore src/streams/.gitignore | 15 --------------- 1 files changed, 0 insertions(+), 15 deletions(-) commit d44e8f9de268bd7659308bdc9e2407f324862940 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 12 01:45:35 2010 +0100 Replace EQ with EQL. src/base/scl-gray-streams.lisp | 2 +- src/iolib/pkgdcl.lisp | 4 ++-- src/os/os-unix.lisp | 4 ++-- src/sockets/dns/lookup.lisp | 4 ++-- src/sockets/dns/query.lisp | 6 +++--- src/sockets/make-socket.lisp | 2 +- src/sockets/namedb/services.lisp | 4 ++-- src/sockets/socket-methods.lisp | 2 +- src/sockets/socket-options.lisp | 4 ++-- src/sockets/trivial-sockets.lisp | 8 ++++---- src/streams/gray/gray-stream-methods.lisp | 22 +++++++++++----------- 11 files changed, 31 insertions(+), 31 deletions(-) commit 6cf587bb302a38a0efe019811ba28f329cdea596 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 12 01:20:59 2010 +0100 PRINT-OBJECT for INET-ADDRESS now respects *PACKAGE*. src/sockets/address.lisp | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) commit 90b85eda8d1bedadbb9020a58c8116a78e21e627 Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Jan 12 01:19:55 2010 +0100 Pass OS environment as optional arg not keyword arg. src/os/os-unix.lisp | 8 ++++---- 1 files changed, 4 insertions(+), 4 deletions(-) commit dcecc4adc34ec57cef79dc073d24c6d701eaa30b Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Fri Jan 8 17:51:58 2010 +0100 Style changes in .asd files: don't qualify ASDF symbols since the file is already loaded into its own *package* that uses ASDF. src/iolib.asd | 10 +++---- src/iolib.base.asd | 4 +- src/iolib.multiplex.asd | 14 ++++------ src/iolib.os.asd | 8 ++---- src/iolib.pathnames.asd | 7 +---- src/iolib.sockets.asd | 53 ++++++++++++++++++++--------------------- src/iolib.streams.asd | 6 +--- src/iolib.syscalls.asd | 21 +++++----------- src/iolib.trivial-sockets.asd | 4 +-- src/iolib.zeta-streams.asd | 11 ++------ 10 files changed, 56 insertions(+), 82 deletions(-) An updated tarball of IOLib's source can be downloaded here: http://common-lisp.net/project/iolib/files/snapshots/iolib-20100113.tar.gz Gitweb URL: http://repo.or.cz/w/iolib.git

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[iolib-devel] accept question
by Peter Keller 13 Jan '10

13 Jan '10

Hello, I have a few questions... On a busy server, sometimes a connection to a server aborts before the accept returns. An example is: client calls connect, server gets SYN, sends back SYN,ack, connect returns in the client, the connection is ESTABLISHED, then some time passes, the client sends RST, and *then* the server calls accept. At this point the accept returns ECONNABORTED (well, it depends on the unix distro, actually). Does iolib internally catch this and restart the accept, is there a signaled condition? what does it do? Also, related, how does iolib, or the underlying implementation's accept, deal with EINTR in the various calls? Especially with a nonblocking connect, which usually requires a trip through select() in order to deal with the socket? And, finally, is there any stable interface to the abstracted multiplexer so I can do nonblocking i/o between multiple clients? If not, the only solution left to me is threading, and I'm not sure how sbcl scales to ten thousand+ threads. Instead of the callback method, is there a "give a pile of read/write/except sockets to a fake select which implements the select semantic with real select/pool/kqueue"? Additionally, is there any means to do nonblocking i/o on *standard-input* or *standard-output*? Thank you. -pete

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[iolib-devel] Serial devices extension: switching from mercurial to git
by marsijanin＠gmail.com 09 Jan '10

09 Jan '10

Good ${current_time_of_day} again! I converted my repo from mercurial to git using `fast-export` (http://repo.or.cz/w/fast-export.git) and placed new git repo at github: http://github.com/marsijanin/iolib.termios/. Hooping that git migration will be useful for future collaboration, Nikolay V. Razbegaiev

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[iolib-devel] New patches: 29-Dec-2009
by Stelian Ionescu 30 Dec '09

30 Dec '09

commit 158f5c25c2209e859420c61e3c073f15b183708e Author: Stelian Ionescu <sionescu(a)cddr.org> Date: Tue Dec 29 18:17:37 2009 +0100 Export restarts IGNORE-SYSCALL-ERROR and RETRY-SYSCALL. src/sockets/pkgdcl.lisp | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) An updated tarball of IOLib's source can be downloaded here: http://common-lisp.net/project/iolib/files/snapshots/iolib-20091229.tar.gz Gitweb URL: http://repo.or.cz/w/iolib.git

1 0

[iolib-devel] Broken code, no syntax errors
by Peter Keller 30 Dec '09

30 Dec '09

Hello, Here is the same code as before, but fixed as to compile, sorry about that. -pete

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