unix: factor out reusable no-fsevents impl

On os390 we implement no support for fsevents.  Other platforms may not
support fsevents either, so provide a dedicated source file to use in
this case.

PR-URL: https://github.com/libuv/libuv/pull/1312
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

Makefile.am

@@ -425,6 +425,7 @@ libuv_la_CFLAGS += -D_UNIX03_THREADS \
 libuv_la_LDFLAGS += -qXPLINK
 libuv_la_SOURCES += src/unix/pthread-fixes.c \
                     src/unix/pthread-barrier.c \
+                    src/unix/no-fsevents.c \
                     src/unix/os390.c \
                     src/unix/os390-syscalls.c \
                     src/unix/proctitle.c

src/unix/no-fsevents.c

@@ -0,0 +1,42 @@
+/* Copyright libuv project contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "internal.h"
+
+#include <errno.h>
+
+int uv_fs_event_init(uv_loop_t* loop, uv_fs_event_t* handle) {
+  return -ENOSYS;
+}
+
+int uv_fs_event_start(uv_fs_event_t* handle, uv_fs_event_cb cb,
+                      const char* filename, unsigned int flags) {
+  return -ENOSYS;
+}
+
+int uv_fs_event_stop(uv_fs_event_t* handle) {
+  return -ENOSYS;
+}
+
+void uv__fs_event_close(uv_fs_event_t* handle) {
+  UNREACHABLE();
+}

src/unix/os390.c

@@ -663,28 +663,6 @@ int uv__io_check_fd(uv_loop_t* loop, int fd) {
   return 0;
 }
 
-
-void uv__fs_event_close(uv_fs_event_t* handle) {
-  UNREACHABLE();
-}
-
-
-int uv_fs_event_init(uv_loop_t* loop, uv_fs_event_t* handle) {
-  return -ENOSYS;
-}
-
-
-int uv_fs_event_start(uv_fs_event_t* handle, uv_fs_event_cb cb,
-                      const char* filename, unsigned int flags) {
-  return -ENOSYS;
-}
-
-
-int uv_fs_event_stop(uv_fs_event_t* handle) {
-  return -ENOSYS;
-}
-
-
 void uv__io_poll(uv_loop_t* loop, int timeout) {
   static const int max_safe_timeout = 1789569;
   struct epoll_event events[1024];

uv.gyp

@@ -317,6 +317,7 @@
           'sources': [
             'src/unix/pthread-fixes.c',
             'src/unix/pthread-barrier.c',
+            'src/unix/no-fsevents.c',
             'src/unix/os390.c',
             'src/unix/os390-syscalls.c'
           ]