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92aabad9 | 1 | /* Special use of signals internally. Linux version. |
04277e02 | 2 | Copyright (C) 2014-2019 Free Software Foundation, Inc. |
23fe486b RM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
23fe486b | 18 | |
92aabad9 AZ |
19 | #ifndef __INTERNAL_SIGNALS_H |
20 | # define __INTERNAL_SIGNALS_H | |
21 | ||
9ff72da4 | 22 | #include <signal.h> |
a992f506 | 23 | #include <sigsetops.h> |
d2dc5467 AZ |
24 | #include <stdbool.h> |
25 | #include <sysdep.h> | |
9ff72da4 | 26 | |
23fe486b RM |
27 | /* The signal used for asynchronous cancelation. */ |
28 | #define SIGCANCEL __SIGRTMIN | |
29 | ||
30 | ||
31 | /* Signal needed for the kernel-supported POSIX timer implementation. | |
32 | We can reuse the cancellation signal since we can distinguish | |
33 | cancellation from timer expirations. */ | |
34 | #define SIGTIMER SIGCANCEL | |
35 | ||
36 | ||
37 | /* Signal used to implement the setuid et.al. functions. */ | |
38 | #define SIGSETXID (__SIGRTMIN + 1) | |
39 | ||
9ff72da4 AZ |
40 | |
41 | /* Return is sig is used internally. */ | |
d2dc5467 | 42 | static inline bool |
92aabad9 | 43 | __is_internal_signal (int sig) |
9ff72da4 | 44 | { |
92aabad9 | 45 | return (sig == SIGCANCEL) || (sig == SIGSETXID); |
9ff72da4 AZ |
46 | } |
47 | ||
2ac88eec AZ |
48 | /* Remove internal glibc signal from the mask. */ |
49 | static inline void | |
92aabad9 | 50 | __clear_internal_signals (sigset_t *set) |
2ac88eec AZ |
51 | { |
52 | __sigdelset (set, SIGCANCEL); | |
2ac88eec AZ |
53 | __sigdelset (set, SIGSETXID); |
54 | } | |
55 | ||
56 | #define SIGALL_SET \ | |
57 | ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } }) | |
58 | ||
59 | /* Block all signals, including internal glibc ones. */ | |
60 | static inline int | |
61 | __libc_signal_block_all (sigset_t *set) | |
62 | { | |
63 | INTERNAL_SYSCALL_DECL (err); | |
64 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET, | |
65 | set, _NSIG / 8); | |
66 | } | |
67 | ||
68 | /* Block all application signals (excluding internal glibc ones). */ | |
69 | static inline int | |
70 | __libc_signal_block_app (sigset_t *set) | |
71 | { | |
72 | sigset_t allset = SIGALL_SET; | |
92aabad9 | 73 | __clear_internal_signals (&allset); |
2ac88eec AZ |
74 | INTERNAL_SYSCALL_DECL (err); |
75 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set, | |
76 | _NSIG / 8); | |
77 | } | |
78 | ||
79 | /* Restore current process signal mask. */ | |
80 | static inline int | |
81 | __libc_signal_restore_set (const sigset_t *set) | |
82 | { | |
83 | INTERNAL_SYSCALL_DECL (err); | |
84 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL, | |
85 | _NSIG / 8); | |
86 | } | |
87 | ||
23fe486b RM |
88 | /* Used to communicate with signal handler. */ |
89 | extern struct xid_command *__xidcmd attribute_hidden; | |
92aabad9 AZ |
90 | |
91 | #endif |