view power.cpp @ 472:0f96ad351990 api-inversion

Clean up some compiler warnings.

Yes, we must check return values from read(2).  Make
audiodb_track_id_datum() be more paranoid, and audiodb_free_datum()
defend against potential double-frees as well (even though we're not
exposing that issue at this point).

#include "audioDB.h"
extern "C" {
#include "audioDB_API.h"
#include "audioDB-internals.h"
}

int audiodb_power(adb_t *adb) {
  if(!(adb->flags & O_RDWR)) {
    return 1;
  }
  if(adb->header->length > 0) {
    return 1;
  }

  adb->header->flags |= O2_FLAG_POWER;
  return audiodb_sync_header(adb);
}