What is a good programming pattern for handling return values from stdio file writing functions

Question

I\'m working on some code that generates a lot of

ignoring return value of ‘size_t fwrite(const void*, size_t, size_t, FILE*)’, declared with attribute warn         


        

Answer 1

Well ... You could create a wrapper function, that re-tries the write if it fails, perhaps up to some maximum number of retries, and returns success/failure:

int safe_fwrite(FILE *file, const void *data, size_t nbytes, unsigned int retries);
void print_and_exit(const char *message);

Then your main code could be written as

#define RETRIES 5
if(!safe_fwrite(fp, &blah, sizeof blah, RETRIES))
  print_and_exit("Blah writing failed, aborting");
if(!safe_fwrite(fp, &foo, sizeof foo, RETRIES))
  print_and_exit("Foo writing failed, aborting");