Re: KLD module with C++ iostreams ?
Aziz KEZZOU [EMAIL PROTECTED] writes: I am wondering if I can use c++ iostreams inside the kernel ? After all the code : cout Hello world! endl; ends accessing the stdout just like : printf(Hello world!\n); right ? There is no stdio in the kernel. So if I could compile my KLD module with static linkage to libstdc++, that should be ok, right ? No. DES -- Dag-Erling Smørgrav - [EMAIL PROTECTED] ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: KLD module with C++ iostreams ?
David Leimbach wrote: Interesting question. People usually have to implement the C++ runtime to be usable from within the kernel. Things like exceptions and stdout may not be defined in kernel space :) I'm not terribly familiar with how it works on FreeBSD but I know it took a special effort to get C++ support into linux. Dave On 4/20/05, Aziz KEZZOU [EMAIL PROTECTED] wrote: Hi hackers, I am wondering if I can use c++ iostreams inside the kernel ? After all the code : cout Hello world! endl; ends accessing the stdout just like : printf(Hello world!\n); right ? No, that's not true, all the iostreams stuff is totally independent. The iostreams stuff is coming from some of the ugliest code in C++. But, that's not the question, or at very least, it shouldn't BE the question. There is ZERO need to bring in features from C++, all it will do is to directly confuse the code base by greatly adding to the complexity of the code, without giving anything like equivalent features. Some very, very elegant work has been code, OO-ing the kernel code, adding OO features, all without violating the C language code base. Adding in C++ features over stdio stuff is so senseless, it's nearly obscene. If the gain at the end of the road was large enough, I wouldn't be against it so stridently, but I see *so* little gain. BTW, you know where the ugliest code in computer science today is: half is in the actual implementation of the cstdio/template code, the other half is the iostreams stuff. The fact that they energize some very elegant code is causing many folks never to see the fact of the horrible code lumps that exist out in the backyard. So if I could compile my KLD module with static linkage to libstdc++, that should be ok, right ? Any one did or knows how to do this ? Thank you guys for responding to my post. Certainly, it is not a good idea to use _all_ C++ stuff inside the kernel ; in the linux community a similar suggestion resulted in a big discussion of pros cons. I was asking because I have a big portion of C++ code that I am planning to move inside the kernel. But, having compared the effort/time required to port C++ iostreams into the kernel and the effort/time required to get rid of iostreams , I think I will abandon this challenge for now ;-) Just to let you know virtual methods and templates, among others, are supported inside the kernel... Greetings, -aziz ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: KLD module with C++ iostreams ?
Interesting question. People usually have to implement the C++ runtime to be usable from within the kernel. Things like exceptions and stdout may not be defined in kernel space :) I'm not terribly familiar with how it works on FreeBSD but I know it took a special effort to get C++ support into linux. Dave On 4/20/05, Aziz KEZZOU [EMAIL PROTECTED] wrote: Hi hackers, I am wondering if I can use c++ iostreams inside the kernel ? After all the code : cout Hello world! endl; ends accessing the stdout just like : printf(Hello world!\n); right ? So if I could compile my KLD module with static linkage to libstdc++, that should be ok, right ? Any one did or knows how to do this ? Thanks, -aziz ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: KLD module with C++ iostreams ?
David Leimbach wrote: Interesting question. People usually have to implement the C++ runtime to be usable from within the kernel. Things like exceptions and stdout may not be defined in kernel space :) I'm not terribly familiar with how it works on FreeBSD but I know it took a special effort to get C++ support into linux. Dave On 4/20/05, Aziz KEZZOU [EMAIL PROTECTED] wrote: Hi hackers, I am wondering if I can use c++ iostreams inside the kernel ? After all the code : cout Hello world! endl; ends accessing the stdout just like : printf(Hello world!\n); right ? No, that's not true, all the iostreams stuff is totally independent. The iostreams stuff is coming from some of the ugliest code in C++. But, that's not the question, or at very least, it shouldn't BE the question. There is ZERO need to bring in features from C++, all it will do is to directly confuse the code base by greatly adding to the complexity of the code, without giving anything like equivalent features. Some very, very elegant work has been code, OO-ing the kernel code, adding OO features, all without violating the C language code base. Adding in C++ features over stdio stuff is so senseless, it's nearly obscene. If the gain at the end of the road was large enough, I wouldn't be against it so stridently, but I see *so* little gain. BTW, you know where the ugliest code in computer science today is: half is in the actual implementation of the cstdio/template code, the other half is the iostreams stuff. The fact that they energize some very elegant code is causing many folks never to see the fact of the horrible code lumps that exist out in the backyard. So if I could compile my KLD module with static linkage to libstdc++, that should be ok, right ? Any one did or knows how to do this ? Thanks, -aziz ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: KLD module with C++ iostreams ?
In message: [EMAIL PROTECTED] Aziz KEZZOU [EMAIL PROTECTED] writes: : Hi hackers, : I am wondering if I can use c++ iostreams inside the kernel ? : After all the code : cout Hello world! endl; : ends accessing the stdout just like : printf(Hello world!\n); right ? Just like, yes. Exactly the same thing as, no. The details matter here. There's a lot of code to make this happen. : So if I could compile my KLD module with static linkage to libstdc++, : that should be ok, right ? No. : Any one did or knows how to do this ? I've done C++ in the kernel before. IT is realtively easy to get very basic functioanlity. You won't have streams, exceptions, etc. However, to have all the features of C++ would take a lot of work. Warner ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
