[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/hurd/ctty-output.c b/ap/libc/glibc/glibc-2.23/hurd/ctty-output.c
new file mode 100644
index 0000000..41286fb
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/hurd/ctty-output.c
@@ -0,0 +1,84 @@
+/* _hurd_ctty_output -- Do an output RPC and generate SIGTTOU if necessary.
+ Copyright (C) 1995-2016 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 SIGTTOU if appropriate. */
+
+error_t
+_hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t))
+{
+ if (ctty == MACH_PORT_NULL)
+ return (*rpc) (port);
+ else
+ {
+ struct hurd_sigstate *ss = _hurd_self_sigstate ();
+ error_t err;
+
+ do
+ {
+ /* Don't use the ctty io port if we are blocking or ignoring
+ SIGTTOU. We redo this check at the top of the loop in case
+ the signal handler changed the state. */
+ __spin_lock (&ss->lock);
+ if (__sigismember (&ss->blocked, SIGTTOU) ||
+ ss->actions[SIGTTOU].sa_handler == SIG_IGN)
+ err = EIO;
+ else
+ err = 0;
+ __spin_unlock (&ss->lock);
+
+ if (err)
+ return (*rpc) (port);
+
+ err = (*rpc) (ctty);
+ if (err == EBACKGROUND)
+ {
+ if (_hurd_orphaned)
+ /* Our process group is orphaned, so we never generate a
+ signal; we just fail. */
+ err = EIO;
+ else
+ {
+ /* Send a SIGTTOU 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, SIGTTOU, port));
+ /* XXX what to do if error here? */
+
+ /* At this point we should have just run the handler for
+ SIGTTOU 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[SIGTTOU].sa_flags & SA_RESTART))
+ err = EINTR;
+ __spin_unlock (&ss->lock);
+ }
+ }
+ /* If the last RPC generated a SIGTTOU, loop to try it again. */
+ } while (err == EBACKGROUND);
+
+ return err;
+ }
+}