From b747ffd9a71c618796a42e3845ef21d3b009c3a4 Mon Sep 17 00:00:00 2001
From: Marcus Brinkmann <mb@g10code.com>
Date: Thu, 2 Jun 2005 22:05:32 +0000
Subject: [PATCH] 2005-06-02  Marcus Brinkmann  <marcus@g10code.de>

	* wait.h (_gpgme_run_io_cb): New prototype.
	* wait.c (_gpgme_run_io_cb): New function.
	* wait-global.c (gpgme_wait): Call it.
	* wait-user.c (_gpgme_user_io_cb_handler): Likewise.
	* wait-private.c (_gpgme_wait_on_condition): Likewise.
---
 gpgme/ChangeLog      |  8 ++++++++
 gpgme/wait-global.c  |  2 +-
 gpgme/wait-private.c |  6 +-----
 gpgme/wait-user.c    |  5 +----
 gpgme/wait.c         | 35 +++++++++++++++++++++++++++++++++++
 gpgme/wait.h         |  2 ++
 6 files changed, 48 insertions(+), 10 deletions(-)

diff --git a/gpgme/ChangeLog b/gpgme/ChangeLog
index 8a348c4..d949da7 100644
--- a/gpgme/ChangeLog
+++ b/gpgme/ChangeLog
@@ -1,3 +1,11 @@
+2005-06-02  Marcus Brinkmann  <marcus@g10code.de>
+
+	* wait.h (_gpgme_run_io_cb): New prototype.
+	* wait.c (_gpgme_run_io_cb): New function.
+	* wait-global.c (gpgme_wait): Call it.
+	* wait-user.c (_gpgme_user_io_cb_handler): Likewise.
+	* wait-private.c (_gpgme_wait_on_condition): Likewise.
+
 2005-06-02  Werner Koch  <wk@g10code.com>
 
 	* gpgme.h: Add GPGME_STATUS_NEED_PASSPHRASE_PIN.
diff --git a/gpgme/wait-global.c b/gpgme/wait-global.c
index f3a5b43..7895d8b 100644
--- a/gpgme/wait-global.c
+++ b/gpgme/wait-global.c
@@ -310,7 +310,7 @@ gpgme_wait (gpgme_ctx_t ctx, gpgme_error_t *status, int hang)
 	      ictx = item->ctx;
 	      assert (ictx);
 
-	      err = item->handler (item->handler_value, fdt.fds[i].fd);
+	      err = _gpgme_run_io_cb (&fdt.fds[i], 0);
 	      if (err)
 		{
 		  /* An error occured.  Close all fds in this context,
diff --git a/gpgme/wait-private.c b/gpgme/wait-private.c
index 166b713..d884c94 100644
--- a/gpgme/wait-private.c
+++ b/gpgme/wait-private.c
@@ -101,15 +101,11 @@ _gpgme_wait_on_condition (gpgme_ctx_t ctx, volatile int *cond)
 	{
 	  if (ctx->fdt.fds[i].fd != -1 && ctx->fdt.fds[i].signaled)
 	    {
-	      struct wait_item_s *item;
-	      
 	      ctx->fdt.fds[i].signaled = 0;
 	      assert (nr);
 	      nr--;
-	      
-	      item = (struct wait_item_s *) ctx->fdt.fds[i].opaque;
 
-	      err = item->handler (item->handler_value, ctx->fdt.fds[i].fd);
+	      err = _gpgme_run_io_cb (&ctx->fdt.fds[i], 0);
 	      if (err)
 		{
 		  /* An error occured.  Close all fds in this context,
diff --git a/gpgme/wait-user.c b/gpgme/wait-user.c
index 3800b4f..ad3c9d3 100644
--- a/gpgme/wait-user.c
+++ b/gpgme/wait-user.c
@@ -42,15 +42,12 @@ _gpgme_user_io_cb_handler (void *data, int fd)
   gpgme_error_t err;
   struct tag *tag = (struct tag *) data;
   gpgme_ctx_t ctx;
-  struct wait_item_s *item;
 
   assert (data);
   ctx = tag->ctx;
   assert (ctx);
-  item = (struct wait_item_s *) ctx->fdt.fds[tag->idx].opaque;
-  assert (item);
 
-  err = (*item->handler) (item->handler_value, fd);
+  err = _gpgme_run_io_cb (&ctx->fdt.fds[tag->idx], 0);
   if (err)
     {
       unsigned int idx;
diff --git a/gpgme/wait.c b/gpgme/wait.c
index f3cc8f6..c787045 100644
--- a/gpgme/wait.c
+++ b/gpgme/wait.c
@@ -167,3 +167,38 @@ _gpgme_remove_io_cb (void *data)
   fdt->fds[idx].for_write = 0;
   fdt->fds[idx].opaque = NULL;
 }
+
+
+/* This is slightly embarrassing.  The problem is that running an I/O
+   callback _may_ influence the status of other file descriptors.  Our
+   own event loops could compensate for that, but the external event
+   loops cannot.  FIXME: We may still want to optimize this a bit when
+   we are called from our own event loops.  So if CHECKED is 1, the
+   check is skipped.  */
+gpgme_error_t
+_gpgme_run_io_cb (struct io_select_fd_s *an_fds, int checked)
+{
+  struct wait_item_s *item;
+  item = (struct wait_item_s *) an_fds->opaque;
+  assert (item);
+
+  if (!checked)
+    {
+      int nr;
+      struct io_select_fd_s fds;
+
+      fds = *an_fds;
+      fds.signaled = 0;
+      /* Just give it a quick poll.  */
+      nr = _gpgme_io_select (&fds, 1, 1);
+      assert (nr <= 1);
+      if (nr < 0)
+	return errno;
+      else if (nr == 0)
+	/* The status changed in the meantime, there is nothing left
+	   to do.  */
+	return 0;
+    }
+
+  return item->handler (item->handler_value, an_fds->fd);
+}
diff --git a/gpgme/wait.h b/gpgme/wait.h
index cec4d8d..eafbb6f 100644
--- a/gpgme/wait.h
+++ b/gpgme/wait.h
@@ -77,4 +77,6 @@ void _gpgme_wait_user_event_cb (void *data, gpgme_event_io_t type,
 
 gpgme_error_t _gpgme_wait_one (gpgme_ctx_t ctx);
 
+gpgme_error_t _gpgme_run_io_cb (struct io_select_fd_s *an_fds, int checked);
+
 #endif	/* WAIT_H */
-- 
2.26.2