55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#include <fcntl.h>
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#include <linux/input.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define MOUSE_DEVICE "/dev/input/event2"
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static __suseconds_t to_us(struct timeval time) {
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return time.tv_sec * 1000000L + time.tv_usec;
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}
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#define EVENT_TIME_PAIR_CNT 1000 * 2
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int main(void) {
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// Open the source device
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int fd_source = open(MOUSE_DEVICE, O_RDONLY);
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if (fd_source < 0) {
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perror("Failed to open source device");
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return 1;
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}
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__suseconds_t times[EVENT_TIME_PAIR_CNT] = {0};
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int tidx = 0;
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// Main loop to read, modify, and write events
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struct input_event ev;
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while (tidx < EVENT_TIME_PAIR_CNT && read(fd_source, &ev, sizeof(ev)) > 0) {
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struct timeval now;
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gettimeofday(&now, NULL);
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times[tidx++] = to_us(ev.time);
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times[tidx++] = to_us(now);
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}
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// Cleanup
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close(fd_source);
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tidx = 0;
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printf("event_time,read_time,diff\n"); // eve'ry is in us
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while (tidx < EVENT_TIME_PAIR_CNT) {
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__suseconds_t event_time = times[tidx++];
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__suseconds_t read_time = times[tidx++];
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/* __suseconds_t diff = ; */
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/* printf("event time: %luus, read time: %luus\n", event_time, read_time);
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*/
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/* printf("time diff: %luus\n", read_time - event_time); */
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printf("%lu,%lu,%lu\n", event_time, read_time, read_time - event_time);
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}
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return 0;
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}
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