Fix delivering the QUIT message when exiting irssi

[stapelberg]

For that, we need to implement g_io_channel_unix_get_fd on the RoubstIOChannel. See also irssi/src/core/net-disconnect.c:net_disconnect_deinit()

[stapelberg]

My current approach is this:

--- i/src/core/robustio.c
+++ w/src/core/robustio.c
@@ -2,6 +2,7 @@
 // © 2015 Michael Stapelberg (see COPYING)

 #include <glib.h>
+#include <unistd.h>

 #include "common.h"
 #include "printtext.h"
@@ -56,6 +57,13 @@ GIOChannel *robust_io_channel_new(SERVER_REC *server) {
     channel = g_new0(RobustIOChannel, 1);
     iochannel = (GIOChannel *)channel;

+    // We leave the write end open forever so that the read end will never
+    // become readable.
+    int pipefd[2];
+
+    pipe(pipefd);
+
+    channel->fd = pipefd[0];
     channel->server = server;

     iochannel->is_readable = FALSE;
diff --git i/src/core/robustio.h w/src/core/robustio.h
index 8da9187..22262c5 100644
--- i/src/core/robustio.h
+++ w/src/core/robustio.h
@@ -4,6 +4,8 @@ typedef struct _RobustIOChannel RobustIOChannel;

 struct _RobustIOChannel {
     GIOChannel channel;
+    // Define |fd| for compatibility with GIOUnixChannel.
+    gint fd;
     SERVER_REC *server;
     struct t_robustsession_ctx *robustsession;
 };

But it still segfaults, and I don’t understand why:

#0  0x00007fe8e83ef9f3 in g_source_unref_internal (source=source@entry=0x1fd88a0, context=context@entry=0x1d7a2e0, have_lock=have_lock@entry=1)
    at gmain.c:2012
#1  0x00007fe8e83f0b39 in g_source_destroy_internal (source=0x1fd88a0, context=0x1d7a2e0, have_lock=0) at gmain.c:1201
#2  0x00007fe8e83f15b5 in g_source_remove (tag=69) at gmain.c:2239
#3  0x000000000049c88a in net_disconnect_remove (rec=0x1eae0f0) at net-disconnect.c:44
#4  0x000000000049cace in net_disconnect_deinit () at net-disconnect.c:135
#5  0x0000000000493498 in core_deinit () at core.c:298
#6  0x000000000042fad0 in textui_deinit () at irssi.c:261
#7  0x000000000042fca8 in main (argc=1, argv=0x7fff239461b8) at irssi.c:386