[PATCH v3 1/2] server: Send console process ID via get_next_console_request()

[Hugh McMaster]

From: Hugh McMaster

conhost.exe needs to know the ID of the connected console process to be
able to load and save application-specific console settings to and from
the registry.
---
 server/console.c    | 12 ++++++++++++
 server/protocol.def |  1 +
 2 files changed, 13 insertions(+)

diff --git a/server/console.c b/server/console.c
index 5f3f50d006f..9320c473dab 100644
--- a/server/console.c
+++ b/server/console.c
@@ -57,6 +57,7 @@ struct console
     struct thread               *renderer;      /* console renderer thread */
     struct screen_buffer        *active;        /* active screen buffer */
     struct console_server       *server;        /* console server object */
+    unsigned int                 pid;           /* console process ID */
     unsigned int                 last_id;       /* id of last created console buffer */
     struct fd                   *fd;            /* for bare console, attached input fd */
     struct async_queue           ioctl_q;       /* ioctl queue */
@@ -538,6 +539,7 @@ static struct object *create_console(void)
     console->active        = NULL;
     console->server        = NULL;
     console->fd            = NULL;
+    console->pid           = 0;
     console->last_id       = 0;
     init_async_queue( &console->ioctl_q );
     init_async_queue( &console->read_q );
@@ -1565,6 +1567,14 @@ DECL_HANDLER(get_next_console_request)
         if (status == STATUS_PENDING) status = STATUS_INVALID_PARAMETER;
         if (async)
         {
+            if (!server->console->pid)
+            {
+                struct process *process = async_get_thread( async )->process;
+
+                if (process->console && process->parent_id == current->process->parent_id)
+                    server->console->pid = process->id;
+            }
+
             iosb = async_get_iosb( async );
             if (iosb->status == STATUS_PENDING)
             {
@@ -1586,6 +1596,8 @@ DECL_HANDLER(get_next_console_request)
         server->busy = 0;
     }

+    reply->pid = server->console->pid;
+
     /* if we have a blocking read ioctl in queue head and previous blocking read is still waiting,
      * move it to read queue for execution after current read is complete. move all blocking
      * ioctl at the same time to preserve their order. */
diff --git a/server/protocol.def b/server/protocol.def
index 8c2fbeb4afe..038c9a4d82f 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -1514,6 +1514,7 @@ enum server_fd_type
     unsigned int status;        /* status of previous ioctl */
     VARARG(out_data,bytes);     /* out_data of previous ioctl */
 @REPLY
+    unsigned int pid;           /* console process ID */
     unsigned int code;          /* ioctl code */
     unsigned int output;        /* output id or 0 for input */
     data_size_t  out_size;      /* ioctl output size */