/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * usb/print - usb printer file server * BUG: Assumes the printer will be always connected and * not hot-plugged. (Otherwise should stay running and * listen to errors to keep the device there as long as it has * not failed). Also, this is untested and done ad-hoc to * replace the print script. */#include <u.h>#include <libc.h>#include <thread.h>#include "usb.h" enum{	Qdir = 0,	Qctl,	Qraw,	Qdata,	Qmax,}; intfindendpoints(Dev *dev, int devid){	Ep *ep;	Dev *d;	Usbdev *ud;	int i, epout; 	epout = -1;	ud = dev->usb;	for(i = 0; i < nelem(ud->ep); i++){		if((ep = ud->ep[i]) == nil)			break;		if(ep->iface->csp != 0x020107)			continue;		if(ep->type == Ebulk && (ep->dir == Eboth || ep->dir == Eout))			if(epout == -1)				epout = ep->id;	}	dprint(2, "print: ep ids: out %d\n", epout);	if(epout == -1)		return -1;	d = openep(dev, epout);	if(d == nil){		fprint(2, "print: openep %d: %r\n", epout);		return -1;	}	opendevdata(d, OWRITE);	if(d->dfd < 0){		fprint(2, "print: open i/o ep data: %r\n");		closedev(d);		return -1;	}	dprint(2, "print: ep out %s\n", d->dir);	if(usbdebug > 1)		devctl(d, "debug 1");	devctl(d, "name lp%d", devid);	return 0;} static intusage(void){	werrstr("usage: usb/print [-N id]");	return -1;} intprintmain(Dev *dev, int argc, char **argv){	int devid; 	devid = dev->id;	ARGBEGIN{	case 'N':		devid = atoi(EARGF(usage()));		break;	default:		return usage();	}ARGEND	if(argc != 0)		return usage(); 	if(findendpoints(dev, devid) < 0){		werrstr("print: endpoints not found");		return -1;	}	return 0;}