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vidcontrol: skip invalid video modes returned by vt(4)

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vt(4) has a stub CONS_MODEINFO ioctl that does not provide any data
but returns success. This needs to be fixed in the kernel, but address
it in vidcontrol(1) as well in case it's run on an older kernel.

Reviewed by:	bde
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2015-04-20 17:43:55 +00:00
parent 867073d7fb
commit 16028f6a5a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281779
1 changed files with 4 additions and 0 deletions
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4
usr.sbin/vidcontrol/vidcontrol.c
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@ -1085,12 +1085,16 @@ show_mode_info(void)
printf("---------------------------------------"
"---------------------------------------\n");
memset(&_info, 0, sizeof(_info));
for (mode = 0; mode <= M_VESA_MODE_MAX; ++mode) {
_info.vi_mode = mode;
if (ioctl(0, CONS_MODEINFO, &_info))
continue;
if (_info.vi_mode != mode)
continue;
if (_info.vi_width == 0 && _info.vi_height == 0 &&
_info.vi_cwidth == 0 && _info.vi_cheight == 0)
continue;
printf("%3d (0x%03x)", mode, mode);
printf(" 0x%08x", _info.vi_flags);