87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2018 K. Lange
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*
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* qemu-display-hack - Manage display size under QEMU
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*
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* Communicates with a harness on the host running QEMU to
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* automatically update the display resolution when the
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* QEMU window size changes, similar to how VirtualBox's
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* display size changing works.
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*
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* This is automatically run at startup if the harness is
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* detected by the 90_qemu_hack.sh startup script.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <kernel/video.h>
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int main(int argc, char * argv[]) {
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if (system("qemu-fwcfg -q opt/org.toaruos.displayharness") != 0) {
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fprintf(stderr, "%s: display harness not enabled\n", argv[0]);
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return 1;
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}
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int fd = open("/dev/fb0", O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "%s: failed to open framebuffer: %s\n", argv[0], strerror(errno));
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return 1;
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}
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struct vid_size s;
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FILE * f = fopen("/dev/ttyS1","r+");
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if (!f) {
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fprintf(stderr, "%s: failed to open serial: %s\n", argv[0], strerror(errno));
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return 1;
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}
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if (!fork()) {
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while (!feof(f)) {
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char data[128];
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fgets(data, 128, f);
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char * linefeed = strstr(data,"\n");
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if (linefeed) { *linefeed = '\0'; }
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char * width;
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char * height;
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width = strstr(data, " ");
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if (width) {
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*width = '\0';
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width++;
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} else {
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continue; /* bad line */
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}
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height = strstr(width, " ");
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if (height) {
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*height = '\0';
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height++;
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} else {
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continue; /* bad line */
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}
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s.width = atoi(width);
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s.height = atoi(height);
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ioctl(fd, IO_VID_SET, &s);
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fprintf(f, "X");
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fflush(f);
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}
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return 0;
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}
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return 0;
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}
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