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28f540f4 | 1 | /* _hurd_ctty_input -- Do an input RPC and generate SIGTTIN if necessary. |
b168057a | 2 | Copyright (C) 1995-2015 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 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://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 (); |
28f540f4 RM |
46 | __spin_lock (&ss->lock); |
47 | if (__sigismember (&ss->blocked, SIGTTIN) || | |
48 | ss->actions[SIGTTIN].sa_handler == SIG_IGN) | |
49 | /* We are blocking or ignoring SIGTTIN. Just fail. */ | |
50 | err = EIO; | |
51 | __spin_unlock (&ss->lock); | |
c84142e8 | 52 | |
1d67062e RM |
53 | if (err == EBACKGROUND) |
54 | { | |
55 | /* Send a SIGTTIN signal to our process group. | |
28f540f4 | 56 | |
1d67062e RM |
57 | We must remember here not to clobber ERR, since |
58 | the loop condition below uses it to recall that | |
59 | we should retry after a stop. */ | |
28f540f4 | 60 | |
1d67062e RM |
61 | __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port)); |
62 | /* XXX what to do if error here? */ | |
63 | ||
64 | /* At this point we should have just run the handler for | |
65 | SIGTTIN or resumed after being stopped. Now this is | |
66 | still a "system call", so check to see if we should | |
67 | restart it. */ | |
68 | __spin_lock (&ss->lock); | |
69 | if (!(ss->actions[SIGTTIN].sa_flags & SA_RESTART)) | |
70 | err = EINTR; | |
71 | __spin_unlock (&ss->lock); | |
72 | } | |
28f540f4 RM |
73 | } |
74 | } | |
75 | /* If the last RPC generated a SIGTTIN, loop to try it again. */ | |
76 | } while (err == EBACKGROUND); | |
77 | ||
78 | return err; | |
79 | } |