Win32: MinGW GCC compatibility.

Several warnings silenced, notably (ngx_socket_t) -1 is now checked
on socket operations instead of -1, as ngx_socket_t is unsigned on win32
and gcc complains on comparison.

With this patch, it's now possible to compile nginx using mingw gcc,
with options we normally compile on win32.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/event/ngx_event_pipe.c b/src/event/ngx_event_pipe.c
index 4ef9b7103..6f685a9ed 100644
--- a/src/event/ngx_event_pipe.c
+++ b/src/event/ngx_event_pipe.c
@@ -57,7 +57,7 @@ ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write)
         do_write = 1;
     }
 
-    if (p->upstream->fd != -1) {
+    if (p->upstream->fd != (ngx_socket_t) -1) {
         rev = p->upstream->read;
 
         flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
@@ -74,7 +74,9 @@ ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write)
         }
     }
 
-    if (p->downstream->fd != -1 && p->downstream->data == p->output_ctx) {
+    if (p->downstream->fd != (ngx_socket_t) -1
+        && p->downstream->data == p->output_ctx)
+    {
         wev = p->downstream->write;
         if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
             return NGX_ABORT;