83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/* _hurd_ctty_output -- Do an output RPC and generate SIGTTOU 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 SIGTTOU if appropriate. */
|
|
|
|
error_t
|
|
_hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t))
|
|
{
|
|
error_t err;
|
|
struct hurd_sigstate *ss;
|
|
io_t ioport;
|
|
|
|
/* Don't use the ctty io port if we are blocking or ignoring SIGTTOU. */
|
|
if (ctty == MACH_PORT_NULL)
|
|
ioport = port;
|
|
else
|
|
{
|
|
ss = _hurd_self_sigstate ();
|
|
__spin_lock (&ss->lock);
|
|
if (__sigismember (&ss->blocked, SIGTTOU) ||
|
|
ss->actions[SIGTTOU].sa_handler == SIG_IGN)
|
|
ioport = port;
|
|
else
|
|
ioport = ctty;
|
|
__spin_unlock (&ss->lock);
|
|
}
|
|
|
|
do
|
|
{
|
|
err = (*rpc) (ioport);
|
|
if (ioport == ctty && 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;
|
|
}
|