As an addition to the previous post by me, I have some pre-existing C code that I want to use in a Genode server I have created, and I don't really want to change this code. Currently, i'm not able to utilize functions like printf, memcpy etc in the C code i've written. What header files can I include to ensure that functions like memcpy and printf work in my code? From what I can see, the build process does not recognize the standard header files at all.
Peter
Hi Peter,
As an addition to the previous post by me, I have some pre-existing C code that I want to use in a Genode server I have created, and I don't really want to change this code. Currently, i'm not able to utilize functions like printf, memcpy etc in the C code i've written. What header files can I include to ensure that functions like memcpy and printf work in my code? From what I can see, the build process does not recognize the standard header files at all.
the functionality you are referring to is provided by the C library. Just include the 'libc' repository to the 'REPOSITORIES' declaration of your '<builddir>/etc/build.conf'. This way, Genode's build system will incorporate the C library into the build process. For using the C library for your program, you need to add 'libc' to the 'LIBS' of your 'target.mk' file. For more information, please refer to 'libc/README'.
Norman
Hello
There is an implementation of some of these functions callable by C code in base/src/base/cxx/misc.cc which becomes part of cxx.lib.a, but I don't see a C header file which exports the interfaces. Depending on the target setup the compiler either takes the header file(s) from itself (system) or from Genode's libc, but the implementation is taken from the cxx library (since it appears in the LIBS list of all targets). I'd prefer to have header files which are created from the sources they are referring to instead of taking them from elsewhere (although I admit that prototypes of memcpy() or printf() should be the same on most systems).
Frank
-----Original Message-----
From: Norman Feske [mailto:norman.feske@...1...]
Sent: Friday, January 22, 2010 8:47 AM
To: Genode OS Framework Mailing List
Subject: Re: additional question from "memcpy, strlen etc."
Hi Peter,
As an addition to the previous post by me, I have some pre-existing
C code
that
I want to use in a Genode server I have created, and I don't really
want to
change this code. Currently, i'm not able to utilize functions like
printf,
memcpy etc in the C code i've written. What header files can I
include to
ensure
that functions like memcpy and printf work in my code? From what I
can see,
the
build process does not recognize the standard header files at all.
the functionality you are referring to is provided by the C library.
Just include the 'libc' repository to the 'REPOSITORIES' declaration
of your '<builddir>/etc/build.conf'. This way, Genode's build system
will incorporate the C library into the build process. For using the
C library for your program, you need to add 'libc' to the 'LIBS' of
your 'target.mk' file. For more information, please refer to
'libc/README'.
Norman
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Hello,
On Friday, 29. January 2010 10:32:25 Frank Kaiser wrote:
There is an implementation of some of these functions callable by C code in base/src/base/cxx/misc.cc which becomes part of cxx.lib.a, but I don't see a C header file which exports the interfaces.
Well, in fact we use the c++ support library provided by the gcc-compiler, you compile Genode with, because it contains a lot of gcc-specific code esp. for exception handling. The c++ support library contains a few unresolved symbols like "memcpy", "malloc", "abort" etc. your system needs to provide. This is what is implemented in "base/src/base/cxx/*". The cxx.lib.a library contains the gcc support library linked against these few functions. Moreover, we hide the symbols of these typical c-library functions to not clash with a fully implemented c-library used on top of the basic Genode primitives, e.g. the libc repository in Genode. Naturally, as you can't use these symbols outside of the library, it makes not sense and is even not wanted to provide header files to these functions.
Depending on the target setup the compiler either takes the header file(s) from itself (system) or from Genode's libc, but the implementation is taken from the cxx library (since it appears in the LIBS list of all targets). I'd prefer to have header files which are created from the sources they are referring to instead of taking them from elsewhere (although I admit that prototypes of memcpy() or printf() should be the same on most systems).
The compiler doesn't use any header files at this point, it simply binds the unresolved symbols of gcc's c++ support library with the compiled code of our provided functions in "base/src/base/cxx/*". There are no header files (outside the Genode tree) involved.
To use c-library code you should link your application against Genode's "libc" (like Norman recommended before).
Kind regards, Stefan
Frank
-----Original Message-----
From: Norman Feske [mailto:norman.feske@...1...]
Sent: Friday, January 22, 2010 8:47 AM
To: Genode OS Framework Mailing List
Subject: Re: additional question from "memcpy, strlen etc."
Hi Peter,
As an addition to the previous post by me, I have some pre-existing
C code
that
I want to use in a Genode server I have created, and I don't really
want to
change this code. Currently, i'm not able to utilize functions like
printf,
memcpy etc in the C code i've written. What header files can I
include to
ensure
that functions like memcpy and printf work in my code? From what I
can see,
the
build process does not recognize the standard header files at all.
the functionality you are referring to is provided by the C library.
Just include the 'libc' repository to the 'REPOSITORIES' declaration
of your '<builddir>/etc/build.conf'. This way, Genode's build system
will incorporate the C library into the build process. For using the
C library for your program, you need to add 'libc' to the 'LIBS' of
your 'target.mk' file. For more information, please refer to
'libc/README'.
Norman
Throughout its 18-year history, RSA Conference consistently attracts
the
world's best and brightest in the field, creating opportunities for
Conference
attendees to learn about information security's most important issues
through
interactions with peers, luminaries and emerging and established
companies.
http://p.sf.net/sfu/rsaconf-dev2dev
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