#include <wvpipe.h>int X = -1;// int X = 0;// int X = 1000;int main(){    const char *argv1[] = { "sh", "-c", 				"while :; do echo foo; sleep 3; done" };    const char *argv2[] = { "sh", "-c", 				"while :; do echo snorkle; sleep 1; done" };    WvPipe stream1(argv1[0], argv1, false, true, false);    WvPipe stream2(argv2[0], argv2, false, true, false);    stream1.autoforward(*wvcon);    stream2.autoforward(*wvcon);        while (stream1.isok() || stream2.isok())    {	if (stream1.select(X))	    stream1.callback();	if (stream2.select(X))	    stream2.callback();    }}