diff options
Diffstat (limited to 'libstdc++-v3/src/c++11/random.cc')
| -rw-r--r-- | libstdc++-v3/src/c++11/random.cc | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libstdc++-v3/src/c++11/random.cc b/libstdc++-v3/src/c++11/random.cc index edf900f6bb7..1d102c755b2 100644 --- a/libstdc++-v3/src/c++11/random.cc +++ b/libstdc++-v3/src/c++11/random.cc @@ -130,13 +130,17 @@ namespace std _GLIBCXX_VISIBILITY(default) #endif result_type __ret; + #ifdef _GLIBCXX_HAVE_UNISTD_H - read(fileno(static_cast<FILE*>(_M_file)), - static_cast<void*>(&__ret), sizeof(result_type)); + auto e = read(fileno(static_cast<FILE*>(_M_file)), + static_cast<void*>(&__ret), sizeof(result_type)); #else - std::fread(static_cast<void*>(&__ret), sizeof(result_type), - 1, static_cast<FILE*>(_M_file)); + auto e = std::fread(static_cast<void*>(&__ret), sizeof(result_type), + 1, static_cast<FILE*>(_M_file)); #endif + if (e != sizeof(result_type)) + __throw_runtime_error(__N("random_device could not read enough bytes")); + return __ret; } |