Pike-devel September 2017

pike-devel@lists.lysator.liu.se

2 participants
12 discussions

managing comport settings in linux
by Henrik Grubbstr�m (Lysator) ＠ Pike (-) developers forum 10 Apr '26

10 Apr '26

Not a good idea; the design philosophy of Pike is that Pike-level code should never be able to cause memory corruption at C-level. With ioctls there's no way to know what data a specific ioctl wants without reading the documentation for that specific ioctl for that specific OS. ioctls and fcntls are a way for device handlers to hook in APIs that aren't standard across all filedescriptors. / Henrik Grubbström (Lysator) Previous text: >2004-08-17 13:32: >Subject: managing comport settings in linux >-------------------------------------------------------------------- >What would be nice, is a way to define ioctl methods in >Pike. Perhaps something like > >object i = Stdio.IOCTL(4242 /* request_id */ ); >i->add_int_parameter(); >i->add_string_parameter(); >i->set_return_type(STRING); > >string ret = i(fd, 1, "somestring"); > > >That ought to be possible, or..? > > / Marcus Agehall (PacketFront) >

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Re: Playing music using pike and SDL.
by Martin Nilsson (lvl 60) ＠ Pike (-) developers forum 13 Mar '26

13 Mar '26

Were you not able to get any C code to play through SDL either? Does your SDL library have a mixer compiled in it (I think it is optional)?

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full MySQL 4.x support. or pike roadmap
by thomas.gusenleitner＠com-bet.com ＠ Pike developers forum 01 Mar '26

01 Mar '26

HI to all! mysql 4.x support works only with a mysql CFLAGS=-DUSE_OLD_FUNCTIONS is this correct ? are there plans to make a full 4.x support ? bye, thomas

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GTK/GDK on OSX
by H William Wellliver III 08 Jan '18

08 Jan '18

I’m running into some build problems on OSX. It seems that the GTK module assumes that if a system is NT that gdkwin.h is used and otherwise gdkx.h is used. Unfortunately, it seems that on some builds of GTK/GDK for OS X, neither of those is correct and that gdkquartz.h should be used. I’m guessing that some configure tests are needed to determine which of the 3 files is actually present. However a quick look at configure.in leaves me unsure how best to include that. Anyone with more expertise in the GTK module’s inner workings care to weigh in? Bill

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Conditional inclusion of inotify_config.h?
by Chris Angelico 23 Nov '17

23 Nov '17

Branch: rosuav/inotify-config Currently, inotify.cmod won't go looking for inotify_config.h unless HAVE_INOTIFY_CONFIG_H is defined. This doesn't seem to match the way other autoheader files get included, and it results in System.Inotify not being available even on systems that support inotify. How does this system work? Is the config file absent in some situations? Not merging this change into trunk yet in case it breaks stuff. ChrisA

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more on smartlink on darwin
by H. William Welliver III 23 Nov '17

23 Nov '17

I’ve looked a little more into the linking problems I’ve been having and noticed that on Darwin, smartlink.c is compiled to use LD_LIBRARY_PATH/LD_RUN_PATH. That’s problematic, because Darwin uses DYLD_LIBRARY_PATH and doesn’t have an equivalent of LD_RUN_PATH, so it doesn’t seem like smart link is doing much of anything for us on Darwin. I considered switching it to use -Wl,-rpath, however the darwin linker -rpath flag works differently from all of the other variants in that it only accepts one path per instance of the flag. smartlink.c seems to be set up to use a colon delimited list, which won’t work on Darwin (well, it isn’t rejected but won’t work as required). Before I start cluttering up smartlink.c with the code necessary to properly support the Darwin linker, does anyone have any thoughts? Bill

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The Crypto module and mere mortals
by Pontus Östlund 23 Nov '17

23 Nov '17

Everytime I need to use the Crypto module, a great wave of anxiety sweeps over me. For most common programmers the case is usually that you need to MD5 or SHA256 som some data to send over HTTP to some REST API or something like that, or compare something to a hash stored in a database or something like that. I had to make HMAC-SHA256 hash yesterday and it took me like 1,5 hours to figure that stuff out: String.string2hex(Crypto.HMAC(Crypto.SHA256)(secret)(data)); Not the most intuitive stuff if you ask me. That led me to the question: Why aren't there any helper methods directly in Crypto, for the more common use cases? So I've been fiddling around with it some and though that maybe something like below could be nice to have. This is just a mockup so feel free to point out if there are better ways to write the code, and if this is something that would fit at all. //! Typedef for a generic hashing function that takes a string as argument //! and returnes a hashed and @[String.string2hex]'ed string. typedef function(string(8bit):string(8bit)) hash_func_t; //! Typedef for a generic HMAC hash function that takes data and a secret as //! arguments and returns a hashed and @[String.string2hex]'ed string typedef function(string(8bit),string(8bit):string(8bit)) hash_hmac_func_t; protected hash_func_t make_hash_func(Crypto.Hash hash, void|bool raw) { return lambda (string in) { string s = hash->hash(in); return raw ? s : String.string2hex(s); }; } protected hash_hmac_func_t make_hash_hmac_func(Crypto.Hash hash, void|bool raw) { return lambda (string data, string secret) { string s = Crypto.HMAC(hash)(secret)(data); return raw ? s : String.string2hex(s); }; } //! Create a HMAC hash of @[data] and @[secret] using the Crypto module @[hash]. //! //! @param hash //! @param data //! @param secret string hash_hmac(Crypto.Hash hash, string data, string secret) { return make_hash_hmac_func(hash)(data, secret); } //! Creates a HMAC hashing function using the Crypto module @[hash]. This can //! later be called with the data and secret to make a hash of. //! //! @returns //! @tt{function(string, string : string)@} variant hash_hmac_func_t hash_hmac(Crypto.Hash hash) { return make_hash_hmac_func(hash); } //! Creates a hash of @[data] using the hashing algorithm in @[hash]. //! If @[raw] is given the hash will not pass through @[String.string2hex]. string hash(Crypto.Hash hash, string data, void|bool raw) { return make_hash_func(hash, raw)(data); } //! Creates a hashing function using the Crypto module @[hash]. This can later //! be called with the data to make a hash of. //! If @[raw] is given the hash will not pass through @[String.string2hex]. //! //! @returns //! @tt{function(string : string)@} variant hash_func_t hash(Crypto.Hash hash, void|bool raw) { return make_hash_func(hash, raw); } hash_hmac_func_t hmac_sha256 = hash_hmac(Crypto.SHA256); hash_hmac_func_t hmac_md5 = hash_hmac(Crypto.MD5); hash_func_t md5 = hash(Crypto.MD5); hash_func_t sha256 = hash(Crypto.SHA256); int main(int argc, array(string) argv) { string data = "my data"; string secret = "abc123"; write("%-20s %s\n", "hash_hmac(MD5):", hash_hmac(Crypto.MD5, data, secret)); write("%-20s %s\n", "hash_hmac_md5:", hmac_md5(data, secret)); write("%-20s %s\n", "hash_hmac_sha256:", hmac_sha256(data, secret)); write("%-20s %s\n", "hash(md5):", hash(Crypto.MD5, data)); write("%-20s %s\n", "hash(md5:raw):", hash(Crypto.MD5, data, true)); write("%-20s %s\n", "md5:", md5(data)); write("%-20s %s\n", "sha256:", sha256(data)); return 0; } Regards ----------------------------- Pontus Östlund Developer • Roxen AB +46 70-662 81 69 www.roxen.com <http://www.roxen.com/> | twitter.com/roxen <https://twitter.com/roxen>

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autoconf and ac_tool_prefix
by H. William Welliver III 23 Nov '17

23 Nov '17

I’ve noticed that there are a number of checks like this in various configure.ins: MY_AC_PATH_PROG(FT_CONFIG, ${ac_tool_prefix}freetype-config, no) The pkgsrc framework automatically sets the --host option (among other things) on configure, which causes ac_tool_prefix to be set to something like x86_64-sun-solaris2.11. The problem is that in this case (and others), there is no x86_64-sun-solaris2.11-freetype-config, only freetype-config. That causes a lot of dependencies to be left unfound, which isn’t ideal. I notice that the check for gcc falls back to gcc, so it’s possible there’s a bug in autoconf itself. Would anyone care to offer an opinion as to the proper solution to this problem? I could create a bunch of symlinks, but that doesn’t seem like the best way to solve this (though it might be the quickest). Bill

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Interactive debugging and live data inspection
by Stephen R. van den Berg 23 Nov '17

23 Nov '17

I just checked in a debugging aid I created to be able to do some live data inspection in running Pike programs (I used it to find the cause of a deadlock in pgsql). I'd appreciate feedback on the implementation and usability of Debug.Peek (in Pike 8.1). To get a rough impression of what it does, here's an excerpt out of the documentation: ------------------------------------------------ Class Debug.Peek Description Allows for interactive debugging and live data structure inspection in both single- and multi-threaded programs. Creates an independent background thread that every pollinterval will show a list of running threads. Optionally, a triggersignal can be specified which allows the dump to be triggered by signal. Example: In the program you'd like to inspect, insert the following one-liner: Debug.Peek("/tmp/test.pike"); Then start the program and keep it running. Next you create a /tmp/test.pike with the following content: void create() { werror("Only once per modification of test.pike\n"); } int main() { werror("This will run every iteration\n"); werror("By returning 1 here, we disable the stacktrace dumps\n"); return 0; } void destroy() { werror("destroy() runs just as often as create()\n"); } Whenever you edit /tmp/test.pike, it will automatically reload the file. ------------------------------------------------ -- Stephen.

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Proposal: Create Stdio.Port from systemd-provided socket
by Chris Angelico 23 Nov '17

23 Nov '17

Branch: rosuav/systemd-sockets Currently, you can create a Stdio.Port("stdin") as a means of accepting a socket handed to you as FD 0. However, there's no way to accept a socket given as any other FD, making it impossible to use this for systemd's sockets. Example: $ cat /etc/systemd/system/listendemo.service [Unit] Description=Listen Demo Requires=listendemo.socket [Service] User=rosuav ExecStart=/usr/local/bin/pike /home/rosuav/listendemo.pike WorkingDirectory=/home/rosuav $ cat /etc/systemd/system/listendemo.socket [Socket] ListenStream=123 $ cat listendemo.pike object mainsock = Stdio.Port("systemd", acceptloop); void acceptloop() { while (object sock=mainsock->accept()) { write("Accepted sock: %O\n", sock); sock->write("Stub\n"); sock->close(); } } int main() { write("Main sock: %O\n", mainsock); return -1; } Note that the "User=rosuav" directive means that Pike is run as a non-root user. This spares the application the hassle of managing privileges securely, as it never gets root privileges (assuming, of course, that the only reason it needed root was to bind to a privileged port, which is true for a lot of programs). As with "stdin" mode, the second parameter is optional (blocking vs nonblocking). This won't break on non-systemd systems for two reasons: firstly, all it ever does is query environment variables, and secondly, it does this only if the application requests it explicitly, so you have to actually ask for it. Is this something that would be useful? Feel free to bikeshed the API - it's not in 8.1 yet, so anything can change. ChrisA

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Pike-devel September 2017