toaruos/apps/set-resolution.c

69 lines
1.4 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2018 K. Lange
*
* set-resolution - Change the display resolution.
*
* Simple tool to interface with the IO_VID_SET ioctl.
*
* TODO: This is probably something we should request from the
* compositor rather than a separate application...
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <kernel/video.h>
int main(int argc, char * argv[]) {
if (argc < 3) {
fprintf(stderr, "Usage: %s [--initialize DRIVER] WIDTH HEIGHT\n", argv[0]);
return 1;
}
/* Open framebuffer */
int fd = open("/dev/fb0", O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
int i = 1;
int init = 0;
char * driver = NULL;
if (argc > 4 && !strcmp(argv[1],"--initialize")) {
init = 1;
driver = argv[2];
i += 2;
}
/* Prepare ioctl from arguments */
struct vid_size s;
s.width = atoi(argv[i]);
s.height = atoi(argv[i+1]);
/* Send ioctl */
if (init) {
char tmp[100];
sprintf(tmp, "%s,%lu,%lu", driver, s.width, s.height);
if (ioctl(fd, IO_VID_REINIT, tmp) < 0) {
perror("ioctl");
return 1;
}
} else {
if (ioctl(fd, IO_VID_SET, &s) < 0) {
perror("ioctl");
return 1;
}
}
return 0;
}