switch to execvp, as system() does its own fork and can cause process to detach completely if parent process dies

git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@677 726aef4b-f618-498e-8847-2d620e286838

FileUtils.cpp

@@ -342,7 +342,14 @@ int CExecSock::popen2(int & iReadFD, int & iWriteFD, const CString & sCommand) {
 		dup2(rpipes[1], 2);
 		close(wpipes[0]);
 		close(rpipes[1]);
-		system( sCommand.c_str() );
+		char *pArgv[] =
+		{
+			"sh",
+			"-c",
+			(char *)sCommand.c_str(),
+			NULL
+		};
+		execvp( "sh", pArgv );
 		exit(0);
 	}