Do not use sigprocmask on Windows

Fixes #85

CHANGES.md

@@ -1,3 +1,6 @@
+## Pending
+
+- fix: No setting of sigprocmask on Windows
 
 ## 0.16
 

src/Tiny_httpd.ml

@@ -27,7 +27,7 @@ open struct
     slice.len <- 0
 end
 
-let create ?(masksigpipe = true) ?max_connections ?(timeout = 0.0) ?buf_size
+let create ?(masksigpipe = not (Sys.win32)) ?max_connections ?(timeout = 0.0) ?buf_size
     ?(get_time_s = Unix.gettimeofday)
     ?(new_thread = fun f -> ignore (Thread.create f () : Thread.t))
     ?(addr = "127.0.0.1") ?(port = 8080) ?sock ?middlewares () : t =

src/Tiny_httpd.mli

@@ -144,7 +144,8 @@ val create :
     {!set_top_handler} to specify how to handle incoming requests.
 
     @param masksigpipe if true, block the signal {!Sys.sigpipe} which otherwise
-    tends to kill client threads when they try to write on broken sockets. Default: [true].
+    tends to kill client threads when they try to write on broken sockets.
+    Default: [true] except when on Windows, which defaults to [false].
 
     @param buf_size size for buffers (since 0.11)
 

src/unix/tiny_httpd_unix.ml

@@ -31,7 +31,7 @@ module Unix_tcp_server_ = struct
     {
       IO.TCP_server.serve =
         (fun ~after_init ~handle () : unit ->
-          if self.masksigpipe then
+          if self.masksigpipe && not (Sys.win32) then
             ignore (Unix.sigprocmask Unix.SIG_BLOCK [ Sys.sigpipe ] : _ list);
           let sock, should_bind =
             match self.sock with
@@ -83,7 +83,7 @@ module Unix_tcp_server_ = struct
                   (Thread.id @@ Thread.self ())
                   (Util.show_sockaddr client_addr));
 
-            if self.masksigpipe then
+            if self.masksigpipe && not (Sys.win32) then
               ignore (Unix.sigprocmask Unix.SIG_BLOCK [ Sys.sigpipe ] : _ list);
             Unix.set_nonblock client_sock;
             Unix.setsockopt client_sock Unix.TCP_NODELAY true;
@@ -113,6 +113,7 @@ module Unix_tcp_server_ = struct
               Sem.acquire 1 self.sem_max_connections;
               (* Block INT/HUP while cloning to avoid children handling them.
                  When thread gets them, our Unix.accept raises neatly. *)
+              if not (Sys.win32) then
                 ignore Unix.(sigprocmask SIG_BLOCK Sys.[ sigint; sighup ]);
               self.new_thread (fun () ->
                   try
@@ -136,6 +137,7 @@ module Unix_tcp_server_ = struct
                           (Util.show_sockaddr client_addr)
                           (Printexc.to_string e)
                           (Printexc.raw_backtrace_to_string bt)));
+              if not (Sys.win32) then
                 ignore Unix.(sigprocmask SIG_UNBLOCK Sys.[ sigint; sighup ])
             | exception Unix.Unix_error ((Unix.EAGAIN | Unix.EWOULDBLOCK), _, _)
               ->