1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/ctty-input.c b/REORG.TODO/hurd/ctty-input.c
new file mode 100644
index 0000000000..826d78bed8
--- /dev/null
+++ b/REORG.TODO/hurd/ctty-input.c
@@ -0,0 +1,79 @@
+/* _hurd_ctty_input -- Do an input RPC and generate SIGTTIN if necessary.
+   Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <hurd.h>
+#include <hurd/signal.h>
+
+/* Call *RPC on PORT and/or CTTY.  If a call on CTTY returns EBACKGROUND,
+   generate SIGTTIN or EIO as appropriate.  */
+
+error_t
+_hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t))
+{
+  error_t err;
+
+  if (ctty == MACH_PORT_NULL)
+    return (*rpc) (port);
+
+  do
+    {
+      err = (*rpc) (ctty);
+      if (err == EBACKGROUND)
+	{
+	  /* We are a background job and tried to read from the tty.
+	     We should probably get a SIGTTIN signal.  */
+	  if (_hurd_orphaned)
+	    /* Our process group is orphaned.  Don't stop; just fail.  */
+	    err = EIO;
+	  else
+	    {
+	      struct hurd_sigstate *ss = _hurd_self_sigstate ();
+	      __spin_lock (&ss->lock);
+	      if (__sigismember (&ss->blocked, SIGTTIN) ||
+		  ss->actions[SIGTTIN].sa_handler == SIG_IGN)
+		/* We are blocking or ignoring SIGTTIN.  Just fail.  */
+		err = EIO;
+	      __spin_unlock (&ss->lock);
+
+	      if (err == EBACKGROUND)
+		{
+		  /* Send a SIGTTIN signal to our process group.
+
+		     We must remember here not to clobber ERR, since
+		     the loop condition below uses it to recall that
+		  we should retry after a stop.  */
+
+		  __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port));
+		  /* XXX what to do if error here? */
+
+		  /* At this point we should have just run the handler for
+		     SIGTTIN or resumed after being stopped.  Now this is
+		     still a "system call", so check to see if we should
+		  restart it.  */
+		  __spin_lock (&ss->lock);
+		  if (!(ss->actions[SIGTTIN].sa_flags & SA_RESTART))
+		    err = EINTR;
+		  __spin_unlock (&ss->lock);
+		}
+	    }
+	}
+      /* If the last RPC generated a SIGTTIN, loop to try it again.  */
+    } while (err == EBACKGROUND);
+
+  return err;
+}