Add overlapped option to jobstart

When UV_OVERLAPPED_PIPE was used for the pipe passed to the child process, a
problem occurred with the standard input of the .Net Framework application
(#11809). Therefore, add the overlapped option to jobstart() and change it so
that it is set only when necessary

src/nvim/channel.c

@@ -301,7 +301,8 @@ static void close_cb(Stream *stream, void *data)
 /// @returns [allocated] channel
 Channel *channel_job_start(char **argv, CallbackReader on_stdout,
                            CallbackReader on_stderr, Callback on_exit,
-                           bool pty, bool rpc, bool detach, const char *cwd,
+                           bool pty, bool rpc, bool overlapped, bool detach,
+                           const char *cwd,
                            uint16_t pty_width, uint16_t pty_height,
                            char *term_name, char **env, varnumber_T *status_out)
 {
@@ -342,6 +343,7 @@ Channel *channel_job_start(char **argv, CallbackReader on_stdout,
   proc->detach = detach;
   proc->cwd = cwd;
   proc->env = env;
+  proc->overlapped = overlapped;
 
   char *cmd = xstrdup(proc->argv[0]);
   bool has_out, has_err;

src/nvim/eval/funcs.c

@@ -4862,6 +4862,7 @@ static void f_jobstart(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   bool rpc = false;
   bool pty = false;
   bool clear_env = false;
+  bool overlapped = false;
   CallbackReader on_stdout = CALLBACK_READER_INIT,
                  on_stderr = CALLBACK_READER_INIT;
   Callback on_exit = CALLBACK_NONE;
@@ -4873,12 +4874,23 @@ static void f_jobstart(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     rpc = tv_dict_get_number(job_opts, "rpc") != 0;
     pty = tv_dict_get_number(job_opts, "pty") != 0;
     clear_env = tv_dict_get_number(job_opts, "clear_env") != 0;
+    overlapped = tv_dict_get_number(job_opts, "overlapped") != 0;
+
     if (pty && rpc) {
       EMSG2(_(e_invarg2), "job cannot have both 'pty' and 'rpc' options set");
       shell_free_argv(argv);
       return;
     }
 
+#ifdef WIN32
+    if (pty && overlapped) {
+      EMSG2(_(e_invarg2),
+            "job cannot have both 'pty' and 'overlapped' options set");
+      shell_free_argv(argv);
+      return;
+    }
+#endif
+
     char *new_cwd = tv_dict_get_string(job_opts, "cwd", false);
     if (new_cwd && strlen(new_cwd) > 0) {
       cwd = new_cwd;
@@ -4945,7 +4957,7 @@ static void f_jobstart(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   }
 
   Channel *chan = channel_job_start(argv, on_stdout, on_stderr, on_exit, pty,
-                                    rpc, detach, cwd, width, height,
+                                    rpc, overlapped, detach, cwd, width, height,
                                     term_name, env, &rettv->vval.v_number);
   if (chan) {
     channel_create_event(chan, NULL);
@@ -7372,8 +7384,8 @@ static void f_rpcstart(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 
   Channel *chan = channel_job_start(argv, CALLBACK_READER_INIT,
                                     CALLBACK_READER_INIT, CALLBACK_NONE,
-                                    false, true, false, NULL, 0, 0, NULL, NULL,
-                                    &rettv->vval.v_number);
+                                    false, true, false, false, NULL, 0, 0,
+                                    NULL, NULL, &rettv->vval.v_number);
   if (chan) {
     channel_create_event(chan, NULL);
   }
@@ -10461,7 +10473,7 @@ static void f_termopen(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 
   uint16_t term_width = MAX(0, curwin->w_width_inner - win_col_off(curwin));
   Channel *chan = channel_job_start(argv, on_stdout, on_stderr, on_exit,
-                                    true, false, false, cwd,
+                                    true, false, false, false, cwd,
                                     term_width, curwin->w_height_inner,
                                     xstrdup("xterm-256color"), NULL,
                                     &rettv->vval.v_number);

src/nvim/event/libuv_process.c

@@ -52,7 +52,7 @@ int libuv_process_spawn(LibuvProcess *uvproc)
   if (!proc->in.closed) {
     uvproc->uvstdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE;
 #ifdef WIN32
-    uvproc->uvstdio[0].flags |= UV_OVERLAPPED_PIPE;
+    uvproc->uvstdio[0].flags |= proc->overlapped ? UV_OVERLAPPED_PIPE : 0;
 #endif
     uvproc->uvstdio[0].data.stream = STRUCT_CAST(uv_stream_t,
                                                  &proc->in.uv.pipe);
@@ -61,8 +61,9 @@ int libuv_process_spawn(LibuvProcess *uvproc)
   if (!proc->out.closed) {
     uvproc->uvstdio[1].flags = UV_CREATE_PIPE | UV_WRITABLE_PIPE;
 #ifdef WIN32
-    // pipe must be readable for IOCP to work.
-    uvproc->uvstdio[1].flags |= UV_READABLE_PIPE | UV_OVERLAPPED_PIPE;
+    // pipe must be readable for IOCP to work on Windows.
+    uvproc->uvstdio[1].flags |= proc->overlapped ?
+      (UV_READABLE_PIPE | UV_OVERLAPPED_PIPE) : 0;
 #endif
     uvproc->uvstdio[1].data.stream = STRUCT_CAST(uv_stream_t,
                                                  &proc->out.uv.pipe);

src/nvim/event/process.h

@@ -27,7 +27,7 @@ struct process {
   Stream in, out, err;
   process_exit_cb cb;
   internal_process_cb internal_exit_cb, internal_close_cb;
-  bool closed, detach;
+  bool closed, detach, overlapped;
   MultiQueue *events;
 };