#include <u.h>
#include <libc.h>
#include <plumb.h>

enum{LEN = 128};

int
match(int n, char *label)
{
	int fd, len;
	char s[LEN];

	snprint(s, LEN, "/dev/wsys/%d/label", n);
	if((fd = open(s, OREAD)) < 0)
		return 0;
	len = strlen(label);
	if(read(fd, s, len) != len || memcmp(s, label, len) != 0){
		close(fd);
		return 0;
	}
	close(fd);
	snprint(s, LEN, "/dev/wsys/%d/wctl", n);
	if((fd = open(s, OWRITE)) < 0)
		return -1;
	fprint(fd, "unhide");
	fprint(fd, "current");
	close(fd);
	return 1;
}

void
findwctl(char *label)
{
	Dir *d;
	int fd, n, i;

	if((fd = open("/dev/wsys", OREAD)) < 0)
		return;
	while((n = dirread(fd, &d)) > 0){
		for(i = 0; i < n; i++)
			if(match(atoi(d[i].name), label)){
				free(d);
				close(fd);
				return;
			}
		free(d);
	}
	close(fd);
}

void
main(int argc, char **argv)
{
	Plumbmsg *m;
	int fd;

	if(argc != 3)
		sysfatal("usage: %s fd label", argv[0]);
	if(strlen(argv[2]) >= LEN)
		sysfatal("label match too long: %s", argv[2]);
	if((fd = plumbopen(argv[1], OREAD)) < 0)
		sysfatal("couldn't open plumb fd %s", argv[1]);
	for(;;){
		if((m = plumbrecv(fd)) == nil)
			sysfatal("error on plumb fd %s", argv[1]);
		plumbfree(m);
		findwctl(argv[2]);
	}
}