If NtReadFile returns STATUS_PENDING, wait for the read to complete. This can happen, for instance, in the case of a FIFO opened with O_RDRW. --- winsup/cygwin/fhandler.cc | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc index b0c9c50c3..a0c3dcce2 100644 --- a/winsup/cygwin/fhandler.cc +++ b/winsup/cygwin/fhandler.cc @@ -215,11 +215,23 @@ fhandler_base::raw_read (void *ptr, size_t& len) NTSTATUS status; IO_STATUS_BLOCK io; int try_noreserve = 1; + DWORD waitret = WAIT_OBJECT_0; retry: status = NtReadFile (get_handle (), NULL, NULL, NULL, &io, ptr, len, NULL, NULL); - if (NT_SUCCESS (status)) + if (status == STATUS_PENDING) + { + waitret = cygwait (get_handle (), cw_infinite, + cw_cancel | cw_sig_eintr); + if (waitret == WAIT_OBJECT_0) + status = io.Status; + } + if (waitret == WAIT_CANCELED) + pthread::static_cancel_self (); + else if (waitret == WAIT_SIGNALED) + set_errno (EINTR); + else if (NT_SUCCESS (status)) len = io.Information; else { -- 2.17.0