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Commit | Line | Data |
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28f540f4 | 1 | /* _hurd_ctty_input -- Do an input RPC and generate SIGTTIN if necessary. |
dff8da6b | 2 | Copyright (C) 1995-2024 Free Software Foundation, Inc. |
c84142e8 | 3 | This file is part of the GNU C Library. |
28f540f4 | 4 | |
c84142e8 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 9 | |
c84142e8 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
28f540f4 RM |
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 SIGTTIN or EIO as appropriate. */ | |
24 | ||
25 | error_t | |
26 | _hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t)) | |
27 | { | |
28 | error_t err; | |
29 | ||
1d67062e RM |
30 | if (ctty == MACH_PORT_NULL) |
31 | return (*rpc) (port); | |
32 | ||
28f540f4 RM |
33 | do |
34 | { | |
1d67062e RM |
35 | err = (*rpc) (ctty); |
36 | if (err == EBACKGROUND) | |
28f540f4 RM |
37 | { |
38 | /* We are a background job and tried to read from the tty. | |
39 | We should probably get a SIGTTIN signal. */ | |
28f540f4 RM |
40 | if (_hurd_orphaned) |
41 | /* Our process group is orphaned. Don't stop; just fail. */ | |
42 | err = EIO; | |
43 | else | |
44 | { | |
1d67062e | 45 | struct hurd_sigstate *ss = _hurd_self_sigstate (); |
653d74f1 JK |
46 | struct sigaction *actions; |
47 | ||
48 | _hurd_sigstate_lock (ss); | |
49 | actions = _hurd_sigstate_actions (ss); | |
34a5a146 | 50 | if (__sigismember (&ss->blocked, SIGTTIN) |
653d74f1 | 51 | || actions[SIGTTIN].sa_handler == SIG_IGN) |
28f540f4 RM |
52 | /* We are blocking or ignoring SIGTTIN. Just fail. */ |
53 | err = EIO; | |
653d74f1 | 54 | _hurd_sigstate_unlock (ss); |
c84142e8 | 55 | |
1d67062e RM |
56 | if (err == EBACKGROUND) |
57 | { | |
58 | /* Send a SIGTTIN signal to our process group. | |
28f540f4 | 59 | |
1d67062e RM |
60 | We must remember here not to clobber ERR, since |
61 | the loop condition below uses it to recall that | |
62 | we should retry after a stop. */ | |
28f540f4 | 63 | |
1d67062e RM |
64 | __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port)); |
65 | /* XXX what to do if error here? */ | |
66 | ||
67 | /* At this point we should have just run the handler for | |
68 | SIGTTIN or resumed after being stopped. Now this is | |
69 | still a "system call", so check to see if we should | |
70 | restart it. */ | |
653d74f1 JK |
71 | _hurd_sigstate_lock (ss); |
72 | actions = _hurd_sigstate_actions (ss); | |
73 | if (!(actions[SIGTTIN].sa_flags & SA_RESTART)) | |
1d67062e | 74 | err = EINTR; |
653d74f1 | 75 | _hurd_sigstate_unlock (ss); |
1d67062e | 76 | } |
28f540f4 RM |
77 | } |
78 | } | |
79 | /* If the last RPC generated a SIGTTIN, loop to try it again. */ | |
80 | } while (err == EBACKGROUND); | |
81 | ||
82 | return err; | |
83 | } |