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Alternative check for sockets in win32/select.c, fixes #19722 #19725

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Alternative check for sockets in win32/select.c, fixes #19722 #19725

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fabe490
Proposed fix for #19722
dktapps Sep 5, 2025
67f5d4d
Fixed rebase error
dktapps Sep 5, 2025
7e60f7c
Don't add handles to fd list if they're invalid
dktapps Sep 7, 2025
91c9610
Remove unnecessary line
dktapps Sep 7, 2025
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8 changes: 6 additions & 2 deletions win32/select.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,9 +66,12 @@ PHPAPI int php_select(php_socket_t max_fd, fd_set *rfds, fd_set *wfds, fd_set *e
/* build an array of handles for non-sockets */
for (i = 0; (uint32_t)i < max_fd; i++) {
if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
handles[n_handles] = (HANDLE)(uintptr_t)_get_osfhandle(i);
if (handles[n_handles] == INVALID_HANDLE_VALUE) {
int _type;
int _len = sizeof(_type);

if (getsockopt((SOCKET)i, SOL_SOCKET, SO_TYPE, (char*)&_type, &_len) == 0 || WSAGetLastError() != WSAENOTSOCK) {
/* socket */
handles[n_handles] = INVALID_HANDLE_VALUE;
if (SAFE_FD_ISSET(i, rfds)) {
FD_SET((uint32_t)i, &sock_read);
}
Expand All @@ -82,6 +85,7 @@ PHPAPI int php_select(php_socket_t max_fd, fd_set *rfds, fd_set *wfds, fd_set *e
sock_max_fd = i;
}
} else {
handles[n_handles] = (HANDLE)(uintptr_t)_get_osfhandle(i);
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I wonder wether an INVALID_HANDLE_VALUE can be returned here, and what to do in this case. Previously, that would have been treated as socket. Maybe we should stick with this; otherwise, it might be prudent to ignore such invalid handles.

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Good catch, I hadn't considered that. I'm doubtful assuming it's a socket is a good idea since that might cause issues with socket-specific parts of the code. Probably best to just skip them.

if (SAFE_FD_ISSET(i, rfds) && GetFileType(handles[n_handles]) == FILE_TYPE_PIPE) {
num_read_pipes++;
}
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