Remove chvt(1) from sbase as it is not portable

chvt(1) has been moved to ubase.

Makefile

@@ -32,7 +32,6 @@ SRC = \
 	chmod.c    \
 	chown.c    \
 	chroot.c   \
-	chvt.c     \
 	cksum.c    \
 	cmp.c      \
 	comm.c     \

chvt.1

@@ -1,11 +0,0 @@
-.TH CHVT 1 sbase\-VERSION
-.SH NAME
-chvt \- change foreground virtual terminal
-.SH SYNOPSIS
-.B chvt
-.I N
-.SH DESCRIPTION
-.B chvt
-brings /dev/ttyN to the foreground. This has the
-same effect as Ctrl-Alt-FN.
-

chvt.c

@@ -1,61 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include "util.h"
-
-enum {
-	/* from <linux/vt.h> */
-	VT_ACTIVATE = 0x5606,
-	VT_WAITACTIVE = 0x5607,
-	/* from <linux/kd.h> */
-	KDGKBTYPE = 0x4B33
-};
-
-char *vts[] = {
-	"/proc/self/fd/0",
-	"/dev/console",
-	"/dev/tty",
-	"/dev/tty0",
-};
-
-static void
-usage(void)
-{
-	eprintf("usage: chvt N\n");
-}
-
-int
-main(int argc, char **argv)
-{
-	int n, i, fd;
-	char c;
-
-	if(argc!=2 || strspn(argv[1], "1234567890") != strlen(argv[1]))
-		usage();
-
-	n = atoi(argv[1]);
-	for(i = 0; i < LEN(vts); i++) {
-		fd = open(vts[i], O_RDONLY);
-		if(fd < 1)
-			continue;
-		c = 0;
-		if(ioctl(fd, KDGKBTYPE, &c) == 0)
-			goto VTfound;
-		close(fd);
-	}
-
-	eprintf("chvt: couldn't find a console.\n");
-VTfound:
-	if(ioctl(fd, VT_ACTIVATE, n) == -1)
-		eprintf("chvt: VT_ACTIVATE '%d':", n);
-	if(ioctl(fd, VT_WAITACTIVE, n) == -1)
-		eprintf("chvt: VT_WAITACTIVE '%d':", n);
-	close(fd);
-
-	return 0;
-}
-