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void do_stuff(void) {
  FILE *logfile = fopen("log", "a");
  if(logfile == NULL) {
    /* handle error */
  }

  /* Writewrite logs pertaining to do_stuff() */

  /* ... */
}

int main(void) {
  FILE *logfile = fopen("log", "a");
  if(logfile == NULL) {
    /* handle error */
  }

  /* Writewrite logs pertaining to main() */

  do_stuff();

  /* ... */
}

void do_stuff(FILE *logfile) {
  /* Writewrite logs pertaining to do_stuff() */

  /* ... */
}

int main(void) {
  FILE *logfile = fopen("log", "a");
  if(logfile == NULL) {
    /* handle error */
  }

  /* Writewrite logs pertaining to main() */

  do_stuff(logfile);

  /* ... */
}