Hi Sebastian (and hi all),
I'm sure that I'm missing something in the procedure that you suggested me.
Here what I have done:
1) downloaded source code from collectd v. 5.1.0
2) tar xvfz of the source code
3) run ./configure // in order to create the config.h file
4) create the foo.cpp file as you suggested
5) run g++ -I./src/ -DHAVE_CONFIG_H -shared -fPIC -o foo.so foo.cpp
and I got several errors:
[mex@shrek collectd-5.1.0]$ g++ -I./src/ -DHAVE_CONFIG_H -shared -fPIC
-o foo.so foo.cpp
In file included from ./src/plugin.h:26:0,
from ./src/common.h:27,
from foo.cpp:3:
./src/configfile.h:105:52: error: ‘_Bool’ has not been declared
In file included from ./src/plugin.h:27:0,
from ./src/common.h:27,
from foo.cpp:3:
./src/meta_data.h:62:5: error: ‘_Bool’ has not been declared
./src/meta_data.h:78:5: error: ‘_Bool’ has not been declared
In file included from ./src/common.h:27:0,
from foo.cpp:3:
./src/plugin.h:139:3: error: ‘_Bool’ does not name a type
./src/plugin.h:359:5: error: ‘_Bool’ has not been declared
In file included from foo.cpp:3:0:
./src/common.h:263:3: error: ‘_Bool’ has not been declared
What am I doing wrong?
Thanks,
M
On 08/03/2012 04:15 PM, Sebastian Harl wrote:
Hi,
On Fri, Aug 03, 2012 at 03:56:20PM +0200, Massimo Canonico wrote:
I have to get the collectd data (in particular, the idle time of the
last 4 measures) and use it in my C++ code.
Is there any example available? Do you have any suggestion concerning
which is the best way to do it?
While I have never tested this, this should be fairly simple. You'll
have to make sure that the callback functions and register_module() are
linked according to the C calling conventions, i.e., those functions
have to be declared "extern C". You should then be able to call any C++
code from those functions and compile the whole thing using a C++
compiler.
So, in short, an example should look something like this:
foo.cpp:
extern "C" {
#include "collectd.h"
#include "common.h"
#include "plugin.h"
}
/* further, possibly C++, includes */
extern "C" {
static int foo_read(void);
void module_register(void);
}
static int
foo_read(void) { /* ... */ }
void
module_register(void) {
plugin_register_read("foo", foo_read);
}
Compile that, again untested, using something like:
g++ -DHAVE_CONFIG_H -shared -fPIC -o foo.so foo.cpp
In case you manage to get that up and running, it would be nice to get
some feedback / short howto / example / whatever on the list or in the
wiki :-)
HTH,
Sebastian
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