/*
-----BEGIN QCMOD-----
name: Linux Directory Notification
-----END QCMOD-----
*/

#include<unistd.h>
#include<fcntl.h>
#include<signal.h>
#include<sys/utsname.h>

//----------------------------------------------------------------------------
// qc_dnotify
//----------------------------------------------------------------------------
class qc_dnotify : public ConfObj
{
public:
	qc_dnotify(Conf *c) : ConfObj(c)
	{
	}

	~qc_dnotify()
	{
		remove("ftest.c");
		remove("ftest.o");
	}

	QString name() const { return "Linux Directory Notification"; }
	QString shortname() const { return "dnotify"; }

	bool do_write()
	{
		char *fdata =
			"#define _GNU_SOURCE\n"
			"#include<unistd.h>\n"
			"#include<fcntl.h>\n"
			"#include<signal.h>\n"
			"#include<sys/utsname.h>\n"
			"\n"
			"int main()\n"
			"{\n"
			"    DN_DELETE|DN_CREATE|DN_RENAME|DN_MULTISHOT|DN_MODIFY|DN_ATTRIB;\n"
			"    return 0;\n"
			"}\n";

		FILE *f;
		f = fopen("ftest.c", "w");
		if(!f)
			return false;
		fwrite(fdata, strlen(fdata), 1, f);
		fclose(f);

		return true;
	}

	bool do_compile()
	{
		QString str = conf->qvar("QMAKE_CC") + " -c ftest.c -o ftest.o";
		int r = conf->doCommand(str);
		if(r == 0)
			return true;
		else
			return false;
	}

	bool exec()
	{
		// taken from KDE
		bool supports_dnotify = true; // not guilty until proven guilty
		struct utsname uts;
		int major, minor, patch;
		if(uname(&uts) < 0)
			supports_dnotify = false; // *shrug*
		else if(sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) != 3)
			supports_dnotify = false; // *shrug*
		else if( major * 1000000 + minor * 1000 + patch < 2004019 ) // <2.4.19
			supports_dnotify = false;
		if(!supports_dnotify)
			return false;

		if(!do_write())
			return false;
		if(!do_compile())
			return false;

		conf->addDefine("HAVE_DNOTIFY");
		return true;
	}
};