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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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/* _hurd_ctty_input -- Do an input RPC and generate SIGTTIN if necessary.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <hurd.h>
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#include <hurd/signal.h>
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/* Call *RPC on PORT and/or CTTY. If a call on CTTY returns EBACKGROUND,
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generate SIGTTIN or EIO as appropriate. */
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error_t
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_hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t))
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{
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error_t err;
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do
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{
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err = (*rpc) (ctty != MACH_PORT_NULL ? ctty : port);
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if (ctty != MACH_PORT_NULL && err == EBACKGROUND)
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{
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/* We are a background job and tried to read from the tty.
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We should probably get a SIGTTIN signal. */
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struct hurd_sigstate *ss;
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if (_hurd_orphaned)
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/* Our process group is orphaned. Don't stop; just fail. */
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err = EIO;
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else
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{
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ss = _hurd_self_sigstate ();
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__spin_lock (&ss->lock);
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if (__sigismember (&ss->blocked, SIGTTIN) ||
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ss->actions[SIGTTIN].sa_handler == SIG_IGN)
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/* We are blocking or ignoring SIGTTIN. Just fail. */
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err = EIO;
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__spin_unlock (&ss->lock);
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}
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if (err == EBACKGROUND)
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{
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/* Send a SIGTTIN signal to our process group.
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We must remember here not to clobber ERR, since
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the loop condition below uses it to recall that
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we should retry after a stop. */
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__USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port));
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/* XXX what to do if error here? */
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/* At this point we should have just run the handler for
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SIGTTIN or resumed after being stopped. Now this is
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still a "system call", so check to see if we should
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restart it. */
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__spin_lock (&ss->lock);
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if (!(ss->actions[SIGTTIN].sa_flags & SA_RESTART))
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err = EINTR;
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__spin_unlock (&ss->lock);
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}
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}
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/* If the last RPC generated a SIGTTIN, loop to try it again. */
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} while (err == EBACKGROUND);
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return err;
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}
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