39 lines
910 B
C
39 lines
910 B
C
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#include <sys/time.h>
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#include <dev/wscons/wsconsio.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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int
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main(int argc, char *argv[])
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{
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int fd, vtnum;
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struct wsdisplay_addscreendata screendata;
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struct timeval t0, t1, dt;
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fd = open("/dev/ttyC0", O_RDWR);
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if (fd < 0)
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err(2, "open /dev/ttyC0");
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if (argc == 2) {
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vtnum = atoi(argv[1]);
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gettimeofday(&t0, NULL);
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if (ioctl(fd, WSDISPLAYIO_SETSCREEN, &vtnum) < 0)
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err(2, "SETSCREEN");
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gettimeofday(&t1, NULL);
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timersub(&t1, &t0, &dt);
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printf("vt switch took %lu %ld %lf ms\n",
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(unsigned long)dt.tv_sec, (long)dt.tv_usec,
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dt.tv_usec/1000.0);
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}
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screendata.idx = -1;
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if (ioctl(fd, WSDISPLAYIO_GETSCREEN, &screendata) < 0)
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err(2, "GETSCREEN");
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printf("Current VT: %d %s %s\n", screendata.idx,
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screendata.screentype, screendata.emul);
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exit(0);
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}
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