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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <linux/input.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <termios.h>
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#include <signal.h>
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void perror_exit(char *error)
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{
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perror(error);
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printf("\nexiting...(%d)\n", 9);
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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uint32_t counter;
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struct input_event ev[64];
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int fd, rd, value;
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int size = sizeof(struct input_event);
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char name[256] = "Unknown";
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char *device = NULL;
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FILE *out_file;
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// Make sure the user is root
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if ((getuid ()) != 0)
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{
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printf ("\nYou must be root to display keypress counts.\n\n");
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exit(0);
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}
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// Setup check
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if (argv[1] == NULL)
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{
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printf("Please specify (on the command line) the path to the dev event interface device\n");
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exit(0);
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}
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if (argc > 1)
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{
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device = argv[1];
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}
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if (argc > 2)
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{
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out_file = fopen(argv[2], "w");
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if (out_file == NULL)
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{
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printf("Unable to open file %s", argv[2]);
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exit(0);
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}
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}
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// Open specified device
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if ((fd = open (device, O_RDONLY)) == -1)
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{
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printf("%s is not a vaild device.\n", device);
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exit(0);
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}
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// Print device name
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//ioctl (fd, EVIOCGNAME(sizeof(name)), name);
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//printf ("Reading From : %s (%s)\n", device, name);
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// Main loop, read
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counter = 0;
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while(1)
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{
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if ((rd = read(fd, ev, size * 64)) < size)
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{
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perror_exit("read()");
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}
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value = ev[0].value;
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// Only read the key press event
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if (value != ' ' && ev[1].value == 1 && ev[1].type == 1)
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{
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counter++;
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// If a filename was given, output to that file
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if (argc > 2)
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{
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// Seek to beginning of file, output and flush to file
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fseek(out_file, 0, SEEK_SET);
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fprintf(out_file, "%10u", counter);
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fflush(out_file);
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}
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else
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{
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// Otherwise print to stdout
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// Print count, fixed width of 10 spaces, over of the same line
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printf("\r%10u", counter);
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fflush(stdout);
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}
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// Check for (hopefully rare) overflow condition
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if (counter == UINT32_MAX)
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{
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printf("\nGADZOOKS BATMAN!!! You overflowed a 32 bit unsigned integer with all your keystrokes!\n\n");
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counter = 0;
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}
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}
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}
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fclose(out_file);
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return 0;
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}
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