--- a/src/os/win32/ngx_os.h
+++ b/src/os/win32/ngx_os.h
@@ -23,9 +23,9 @@
 
 
 typedef struct {
-    ssize_t       (*recv)(ngx_connection_t *c, char *buf, size_t size);
+    ssize_t       (*recv)(ngx_connection_t *c, u_char *buf, size_t size);
     ssize_t       (*recv_chain)(ngx_connection_t *c, ngx_chain_t *in);
-    ssize_t       (*send)(ngx_connection_t *c, char *buf, size_t size);
+    ssize_t       (*send)(ngx_connection_t *c, u_char *buf, size_t size);
     ngx_chain_t  *(*send_chain)(ngx_connection_t *c, ngx_chain_t *in);
     int             flags;
 } ngx_os_io_t;
@@ -33,8 +33,8 @@ typedef struct {
 
 int ngx_os_init(ngx_log_t *log);
 
-ssize_t ngx_wsarecv(ngx_connection_t *c, char *buf, size_t size);
-ssize_t ngx_overlapped_wsarecv(ngx_connection_t *c, char *buf, size_t size);
+ssize_t ngx_wsarecv(ngx_connection_t *c, u_char *buf, size_t size);
+ssize_t ngx_overlapped_wsarecv(ngx_connection_t *c, u_char *buf, size_t size);
 ssize_t ngx_wsarecv_chain(ngx_connection_t *c, ngx_chain_t *chain);
 ngx_chain_t *ngx_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in);
 ngx_chain_t *ngx_overlapped_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in);
@@ -46,15 +46,6 @@ extern int          ngx_inherited_nonblo
 extern int          ngx_win32_version;
 
 
-extern ngx_int_t    ngx_process;
-
-extern ngx_int_t    ngx_quit;
-extern ngx_int_t    ngx_terminate;
-
-extern ngx_int_t    ngx_reconfigure;
-extern ngx_int_t    ngx_reopen;
-
-
 
 #endif /* _NGX_OS_H_INCLUDED_ */