Commit | Line | Data |
---|---|---|
f348d89a PA |
1 | /* Copyright (C) 2016 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program 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 | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "common-defs.h" | |
19 | #include "signals-state-save-restore.h" | |
20 | ||
21 | #include <signal.h> | |
22 | ||
23 | /* The original signal actions and mask. */ | |
24 | ||
25 | #ifdef HAVE_SIGACTION | |
26 | static struct sigaction original_signal_actions[NSIG]; | |
27 | ||
28 | /* Note that we use sigprocmask without worrying about threads because | |
29 | the save/restore functions are called either from main, or after a | |
30 | fork. In both cases, we know the calling process is single | |
31 | threaded. */ | |
32 | static sigset_t original_signal_mask; | |
33 | #endif | |
34 | ||
35 | /* See signals-state-save-restore.h. */ | |
36 | ||
37 | void | |
38 | save_original_signals_state (void) | |
39 | { | |
40 | #ifdef HAVE_SIGACTION | |
41 | int i; | |
42 | int res; | |
43 | ||
44 | res = sigprocmask (0, NULL, &original_signal_mask); | |
45 | if (res == -1) | |
46 | perror_with_name ("sigprocmask"); | |
47 | ||
48 | for (i = 1; i < NSIG; i++) | |
49 | { | |
50 | struct sigaction *oldact = &original_signal_actions[i]; | |
51 | ||
52 | res = sigaction (i, NULL, oldact); | |
53 | if (res == -1 && errno == EINVAL) | |
54 | { | |
55 | /* Some signal numbers in the range are invalid. */ | |
56 | continue; | |
57 | } | |
58 | else if (res == -1) | |
59 | perror_with_name ("sigaction"); | |
60 | ||
61 | /* If we find a custom signal handler already installed, then | |
62 | this function was called too late. */ | |
63 | if (oldact->sa_handler != SIG_DFL && oldact->sa_handler != SIG_IGN) | |
64 | internal_error (__FILE__, __LINE__, _("unexpected signal handler")); | |
65 | } | |
66 | #endif | |
67 | } | |
68 | ||
69 | /* See signals-state-save-restore.h. */ | |
70 | ||
71 | void | |
72 | restore_original_signals_state (void) | |
73 | { | |
74 | #ifdef HAVE_SIGACTION | |
75 | int i; | |
76 | int res; | |
77 | ||
78 | for (i = 1; i < NSIG; i++) | |
79 | { | |
80 | res = sigaction (i, &original_signal_actions[i], NULL); | |
81 | if (res == -1 && errno == EINVAL) | |
82 | { | |
83 | /* Some signal numbers in the range are invalid. */ | |
84 | continue; | |
85 | } | |
86 | else if (res == -1) | |
87 | perror_with_name ("sigaction"); | |
88 | } | |
89 | ||
90 | res = sigprocmask (SIG_SETMASK, &original_signal_mask, NULL); | |
91 | if (res == -1) | |
92 | perror_with_name ("sigprocmask"); | |
93 | #endif | |
94 | } |