diff options
Diffstat (limited to 'win32')
| -rw-r--r-- | win32/win32.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/win32/win32.c b/win32/win32.c index 7a7078335f..c21fca6fbc 100644 --- a/win32/win32.c +++ b/win32/win32.c @@ -1827,7 +1827,12 @@ rb_w32_fdclr(int fd, fd_set *set) int rb_w32_fdisset(int fd, fd_set *set) { - return __WSAFDIsSet(TO_SOCKET(fd), set); + int ret; + SOCKET s = TO_SOCKET(fd); + if (s == (SOCKET)INVALID_HANDLE_VALUE) + return 0; + RUBY_CRITICAL(ret = __WSAFDIsSet(s, set)); + return ret; } // |