cpu_temp.c

#include "../../../common/include/message.h"
#include "../../../common/include/userspace_comm.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
  if (argc < 3 || argc > 3) {
    printf("Invalid arguments provided");
    return EXIT_FAILURE;
  }

  userspace_send_handle_t userspace_send_handle;
  if (create_userspace_send_handle(&userspace_send_handle) == -1) {
    perror("Failed to open message queue");
    return EXIT_FAILURE;
  }

  int file_fd = open("/sys/class/thermal/thermal_zone0/temp", O_RDONLY);
  if (file_fd == -1) {
    perror("Failed to open file");
    return EXIT_FAILURE;
  }

  double cpu_temp;
  char buffer[6];

  int sleep_ms = atoi(argv[2]);

  while (1) {
    if (pread(file_fd, buffer, sizeof(buffer), 0) == -1) {
      perror("Failed to read file");
      continue;
    }

    cpu_temp = (double)atoi(buffer) / 1000;

    message_t message = {
        .measurement_id = atoi(argv[1]),
        .datatype = FLOAT64,
        .data.float64 = cpu_temp,
    };

    send_userspace_message(&userspace_send_handle, message);

    usleep(sleep_ms * 1000);
  }

  destroy_userspace_send_handle(&userspace_send_handle);
  close(file_fd);

  return EXIT_SUCCESS;
}