1 /* Special use of signals internally. Linux version.
2 Copyright (C) 2014-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #ifndef __INTERNAL_SIGNALS_H
20 # define __INTERNAL_SIGNALS_H
23 #include <sigsetops.h>
25 /* The signal used for asynchronous cancelation. */
26 #define SIGCANCEL __SIGRTMIN
29 /* Signal needed for the kernel-supported POSIX timer implementation.
30 We can reuse the cancellation signal since we can distinguish
31 cancellation from timer expirations. */
32 #define SIGTIMER SIGCANCEL
35 /* Signal used to implement the setuid et.al. functions. */
36 #define SIGSETXID (__SIGRTMIN + 1)
39 /* Return is sig is used internally. */
41 __is_internal_signal (int sig)
43 return (sig == SIGCANCEL) || (sig == SIGSETXID);
46 /* Remove internal glibc signal from the mask. */
48 __clear_internal_signals (sigset_t *set)
50 __sigdelset (set, SIGCANCEL);
51 __sigdelset (set, SIGSETXID);
55 ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } })
57 /* Block all signals, including internal glibc ones. */
59 __libc_signal_block_all (sigset_t *set)
61 INTERNAL_SYSCALL_DECL (err);
62 return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET,
66 /* Block all application signals (excluding internal glibc ones). */
68 __libc_signal_block_app (sigset_t *set)
70 sigset_t allset = SIGALL_SET;
71 __clear_internal_signals (&allset);
72 INTERNAL_SYSCALL_DECL (err);
73 return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set,
77 /* Restore current process signal mask. */
79 __libc_signal_restore_set (const sigset_t *set)
81 INTERNAL_SYSCALL_DECL (err);
82 return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL,
86 /* Used to communicate with signal handler. */
87 extern struct xid_command *__xidcmd attribute_hidden;