#include <u.h>#include <libc.h>#include <ip.h>#include <bio.h>#include <ndb.h>#include "../dhcp.h"#include "ipconfig.h" voidpppbinddev(void){	int ac, pid;	char *av[12];	Waitmsg *w; 	/* ppp does the binding */ 	/* start with an empty config file */	if(nip == 0)		writendb("", 0, 0); 	switch(pid = rfork(RFPROC|RFFDG|RFMEM)){	case -1:		sysfatal("can't start ppp: %r");	case 0:		ac = 0;		av[ac++] = "ppp";		av[ac++] = "-uf";		av[ac++] = "-p";		av[ac++] = conf.dev;		av[ac++] = "-x";		av[ac++] = conf.mpoint;		if(conf.baud != nil){			av[ac++] = "-b";			av[ac++] = conf.baud;		}		av[ac] = nil;		exec("/bin/ip/ppp", av);		exec("/ppp", av);		sysfatal("execing /ppp: %r");	} 	/* wait for ppp to finish connecting and configuring */	while((w = wait()) != nil){		if(w->pid == pid){			if(w->msg[0] != 0)				sysfatal("/ppp exited with status: %s", w->msg);			free(w);			break;		}		free(w);	}	if(w == nil)		sysfatal("/ppp disappeared"); 	/* ppp sets up the configuration itself */	noconfig = 1;	getndb();}