Close any open FDs if spawn fails (#186)

Addresses issue #185.

uvloop/handles/handle.pyx

@@ -28,8 +28,9 @@ cdef class UVHandle:
     def __dealloc__(self):
         if UVLOOP_DEBUG:
             if self._loop is not None:
-                self._loop._debug_handles_current.subtract([
-                    self.__class__.__name__])
+                if self._inited:
+                    self._loop._debug_handles_current.subtract([
+                        self.__class__.__name__])
             else:
                 # No "@cython.no_gc_clear" decorator on this UVHandle
                 raise RuntimeError(
@@ -72,7 +73,7 @@ cdef class UVHandle:
         if self._handle == NULL:
             return
 
-        if UVLOOP_DEBUG:
+        if UVLOOP_DEBUG and self._inited:
             self._loop._debug_uv_handles_freed += 1
 
         PyMem_RawFree(self._handle)
@@ -99,16 +100,17 @@ cdef class UVHandle:
         if self._handle is not NULL:
             self._free()
 
-        self._closed = 1
-
-        if UVLOOP_DEBUG:
-            name = self.__class__.__name__
-            if self._inited:
-                raise RuntimeError(
-                    '_abort_init: {}._inited is set'.format(name))
-            if self._closed:
-                raise RuntimeError(
-                    '_abort_init: {}._closed is set'.format(name))
+        try:
+            if UVLOOP_DEBUG:
+                name = self.__class__.__name__
+                if self._inited:
+                    raise RuntimeError(
+                        '_abort_init: {}._inited is set'.format(name))
+                if self._closed:
+                    raise RuntimeError(
+                        '_abort_init: {}._closed is set'.format(name))
+        finally:
+            self._closed = 1
 
     cdef inline _finish_init(self):
         self._inited = 1
@@ -117,7 +119,10 @@ cdef class UVHandle:
         if self._loop._debug:
             self._source_traceback = extract_stack()
         if UVLOOP_DEBUG:
+            cls_name = self.__class__.__name__
             self._loop._debug_uv_handles_total += 1
+            self._loop._debug_handles_total.update([cls_name])
+            self._loop._debug_handles_current.update([cls_name])
 
     cdef inline _start_init(self, Loop loop):
         if UVLOOP_DEBUG:
@@ -126,10 +131,6 @@ cdef class UVHandle:
                     '{}._start_init can only be called once'.format(
                         self.__class__.__name__))
 
-            cls_name = self.__class__.__name__
-            loop._debug_handles_total.update([cls_name])
-            loop._debug_handles_current.update([cls_name])
-
         self._loop = loop
 
     cdef inline bint _is_alive(self):

uvloop/handles/process.pyx

@@ -79,10 +79,16 @@ cdef class UVProcess(UVHandle):
 
             if _PyImport_ReleaseLock() < 0:
                 # See CPython/posixmodule.c for details
-                self._abort_init()
+                if err < 0:
+                    self._abort_init()
+                else:
+                    self._close()
                 raise RuntimeError('not holding the import lock')
 
             if err < 0:
+                if UVLOOP_DEBUG and uv.uv_is_active(self._handle):
+                    raise RuntimeError(
+                        'active uv_process_t handle after failed uv_spawn')
                 self._abort_init()
                 raise convert_error(err)
 
@@ -109,6 +115,14 @@ cdef class UVProcess(UVHandle):
                 # Might be already closed
                 pass
 
+            fds_to_close = self._fds_to_close
+            self._fds_to_close = None
+            for fd in fds_to_close:
+                os_close(fd)
+
+            for fd in restore_inheritable:
+                os_set_inheritable(fd, False)
+
         # asyncio caches the PID in BaseSubprocessTransport,
         # so that the transport knows what the PID was even
         # after the process is finished.
@@ -122,14 +136,6 @@ cdef class UVProcess(UVHandle):
         # untrack this handle.
         self._loop._track_process(self)
 
-        for fd in restore_inheritable:
-            os_set_inheritable(fd, False)
-
-        fds_to_close = self._fds_to_close
-        self._fds_to_close = None
-        for fd in fds_to_close:
-            os_close(fd)
-
         if debug_flags & __PROCESS_DEBUG_SLEEP_AFTER_FORK:
             time_sleep(1)
 
@@ -216,7 +222,7 @@ cdef class UVProcess(UVHandle):
 
         for i in range(arr_len):
             el = arr[i]
-            # NB: PyBytes_AsSptring doesn't copy the data;
+            # NB: PyBytes_AsString doesn't copy the data;
             # we have to be careful when the "arr" is GCed,
             # and it shouldn't be ever mutated.
             ret[i] = PyBytes_AsString(el)
@@ -503,10 +509,12 @@ cdef class UVProcessTransport(UVProcess):
 
         assert len(io) == 3
         for idx in range(3):
+            iocnt = &self.iocnt[idx]
             if io[idx] is not None:
-                iocnt = &self.iocnt[idx]
                 iocnt.flags = uv.UV_INHERIT_FD
                 iocnt.data.fd = io[idx]
+            else:
+                iocnt.flags = uv.UV_IGNORE
 
     cdef _call_connection_made(self, waiter):
         try:

uvloop/includes/uv.pxd

@@ -236,6 +236,7 @@ cdef extern from "uv.h" nogil:
     int uv_cancel(uv_req_t* req)
 
     # Generic handler functions
+    int uv_is_active(const uv_handle_t* handle)
     void uv_close(uv_handle_t* handle, uv_close_cb close_cb)
     int uv_is_closing(const uv_handle_t* handle)
     int uv_fileno(const uv_handle_t* handle, uv_os_fd_t* fd)