getline error

can someone please please tell me why this code won't work?

Code:

---

int main(int argc, char *argv[]){

  char* tester = "makefile";
  char* tester1 = "Makefile";

  if (argc == 1){
    fprintf(stderr, "memake: *** No targets specified and no makefile found. Stop.\n");
    return 2;
  }
  else if (strcmp(argv[1], tester) == 0 || strcmp(argv[1], tester1) == 0){
    char* file_to_read = argv[1];
    FILE* fr = fopen(file_to_read, "w");
    if (fr == NULL){
      fprintf(stderr, "%s: trying to open file %s for read\n", strerror(errno), file_to_read);
      exit(3);
    }

    while(1){
      char* line = NULL;
      size_t line_length;
      int chars_read = getline(&line, &line_length, fr);
      if (chars_read == -1){
        if (feof(fr)){
          free(line);
          break;
        }
        perror("getline");
        exit(4);
      }

      char* pch = strtok(line, " :");
      while(pch != NULL){
        printf("%s\n", pch);
        pch = strtok(NULL, " :");
      }

      free(line);
    }

      fclose(fr);

  }

    return 0;

}

---

it always fails when it tries to read a file

trying to open file %s for read

"w" opens for writing

if you know that the filename is "makefile" why to read it from command line parameters?

thanks, stupid error