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23fe486b | 1 | /* Special use of signals in NPTL internals. Linux version. |
688903eb | 2 | Copyright (C) 2014-2018 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 | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
9ff72da4 | 19 | #include <signal.h> |
a992f506 | 20 | #include <sigsetops.h> |
9ff72da4 | 21 | |
23fe486b RM |
22 | /* The signal used for asynchronous cancelation. */ |
23 | #define SIGCANCEL __SIGRTMIN | |
24 | ||
25 | ||
26 | /* Signal needed for the kernel-supported POSIX timer implementation. | |
27 | We can reuse the cancellation signal since we can distinguish | |
28 | cancellation from timer expirations. */ | |
29 | #define SIGTIMER SIGCANCEL | |
30 | ||
31 | ||
32 | /* Signal used to implement the setuid et.al. functions. */ | |
33 | #define SIGSETXID (__SIGRTMIN + 1) | |
34 | ||
9ff72da4 AZ |
35 | |
36 | /* Return is sig is used internally. */ | |
37 | static inline int | |
38 | __nptl_is_internal_signal (int sig) | |
39 | { | |
40 | return (sig == SIGCANCEL) || (sig == SIGTIMER) || (sig == SIGSETXID); | |
41 | } | |
42 | ||
2ac88eec AZ |
43 | /* Remove internal glibc signal from the mask. */ |
44 | static inline void | |
45 | __nptl_clear_internal_signals (sigset_t *set) | |
46 | { | |
47 | __sigdelset (set, SIGCANCEL); | |
48 | __sigdelset (set, SIGTIMER); | |
49 | __sigdelset (set, SIGSETXID); | |
50 | } | |
51 | ||
52 | #define SIGALL_SET \ | |
53 | ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } }) | |
54 | ||
55 | /* Block all signals, including internal glibc ones. */ | |
56 | static inline int | |
57 | __libc_signal_block_all (sigset_t *set) | |
58 | { | |
59 | INTERNAL_SYSCALL_DECL (err); | |
60 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET, | |
61 | set, _NSIG / 8); | |
62 | } | |
63 | ||
64 | /* Block all application signals (excluding internal glibc ones). */ | |
65 | static inline int | |
66 | __libc_signal_block_app (sigset_t *set) | |
67 | { | |
68 | sigset_t allset = SIGALL_SET; | |
69 | __nptl_clear_internal_signals (&allset); | |
70 | INTERNAL_SYSCALL_DECL (err); | |
71 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set, | |
72 | _NSIG / 8); | |
73 | } | |
74 | ||
75 | /* Restore current process signal mask. */ | |
76 | static inline int | |
77 | __libc_signal_restore_set (const sigset_t *set) | |
78 | { | |
79 | INTERNAL_SYSCALL_DECL (err); | |
80 | return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL, | |
81 | _NSIG / 8); | |
82 | } | |
83 | ||
23fe486b RM |
84 | /* Used to communicate with signal handler. */ |
85 | extern struct xid_command *__xidcmd attribute_hidden; |