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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /hurd/ctty-input.c
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initial import
Diffstat (limited to 'hurd/ctty-input.c')
-rw-r--r--hurd/ctty-input.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/hurd/ctty-input.c b/hurd/ctty-input.c
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+++ b/hurd/ctty-input.c
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+/* _hurd_ctty_input -- Do an input RPC and generate SIGTTIN if necessary.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#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;
+
+ do
+ {
+ err = (*rpc) (ctty != MACH_PORT_NULL ? ctty : port);
+ if (ctty != MACH_PORT_NULL && err == EBACKGROUND)
+ {
+ /* We are a background job and tried to read from the tty.
+ We should probably get a SIGTTIN signal. */
+ struct hurd_sigstate *ss;
+ if (_hurd_orphaned)
+ /* Our process group is orphaned. Don't stop; just fail. */
+ err = EIO;
+ else
+ {
+ 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;
+}