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1/* _hurd_ctty_output -- Do an output RPC and generate SIGTTOU if necessary.
2 Copyright (C) 1995-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <hurd.h>
20#include <hurd/signal.h>
21
22/* Call *RPC on PORT and/or CTTY. If a call on CTTY returns EBACKGROUND,
23 generate SIGTTOU if appropriate. */
24
25error_t
26_hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t))
27{
28 if (ctty == MACH_PORT_NULL)
29 return (*rpc) (port);
30 else
31 {
32 struct hurd_sigstate *ss = _hurd_self_sigstate ();
33 error_t err;
34
35 do
36 {
37 /* Don't use the ctty io port if we are blocking or ignoring
38 SIGTTOU. We redo this check at the top of the loop in case
39 the signal handler changed the state. */
40 __spin_lock (&ss->lock);
41 if (__sigismember (&ss->blocked, SIGTTOU)
42 || ss->actions[SIGTTOU].sa_handler == SIG_IGN)
43 err = EIO;
44 else
45 err = 0;
46 __spin_unlock (&ss->lock);
47
48 if (err)
49 return (*rpc) (port);
50
51 err = (*rpc) (ctty);
52 if (err == EBACKGROUND)
53 {
54 if (_hurd_orphaned)
55 /* Our process group is orphaned, so we never generate a
56 signal; we just fail. */
57 err = EIO;
58 else
59 {
60 /* Send a SIGTTOU signal to our process group.
61
62 We must remember here not to clobber ERR, since
63 the loop condition below uses it to recall that
64 we should retry after a stop. */
65
66 __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTOU, port));
67 /* XXX what to do if error here? */
68
69 /* At this point we should have just run the handler for
70 SIGTTOU or resumed after being stopped. Now this is
71 still a "system call", so check to see if we should
72 restart it. */
73 __spin_lock (&ss->lock);
74 if (!(ss->actions[SIGTTOU].sa_flags & SA_RESTART))
75 err = EINTR;
76 __spin_unlock (&ss->lock);
77 }
78 }
79 /* If the last RPC generated a SIGTTOU, loop to try it again. */
80 } while (err == EBACKGROUND);
81
82 return err;
83 }
84}
85

Warning: That file was not part of the compilation database. It may have many parsing errors.