| /* Special use of signals in NPTL internals. Linux version. |
| Copyright (C) 2014-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <signal.h> |
| #include <sigsetops.h> |
| |
| /* The signal used for asynchronous cancelation. */ |
| #define SIGCANCEL __SIGRTMIN |
| |
| |
| /* Signal needed for the kernel-supported POSIX timer implementation. |
| We can reuse the cancellation signal since we can distinguish |
| cancellation from timer expirations. */ |
| #define SIGTIMER SIGCANCEL |
| |
| |
| /* Signal used to implement the setuid et.al. functions. */ |
| #define SIGSETXID (__SIGRTMIN + 1) |
| |
| |
| /* Return is sig is used internally. */ |
| static inline int |
| __nptl_is_internal_signal (int sig) |
| { |
| return (sig == SIGCANCEL) || (sig == SIGTIMER) || (sig == SIGSETXID); |
| } |
| |
| /* Remove internal glibc signal from the mask. */ |
| static inline void |
| __nptl_clear_internal_signals (sigset_t *set) |
| { |
| __sigdelset (set, SIGCANCEL); |
| __sigdelset (set, SIGTIMER); |
| __sigdelset (set, SIGSETXID); |
| } |
| |
| #define SIGALL_SET \ |
| ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } }) |
| |
| /* Block all signals, including internal glibc ones. */ |
| static inline int |
| __libc_signal_block_all (sigset_t *set) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET, |
| set, _NSIG / 8); |
| } |
| |
| /* Block all application signals (excluding internal glibc ones). */ |
| static inline int |
| __libc_signal_block_app (sigset_t *set) |
| { |
| sigset_t allset = SIGALL_SET; |
| __nptl_clear_internal_signals (&allset); |
| INTERNAL_SYSCALL_DECL (err); |
| return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set, |
| _NSIG / 8); |
| } |
| |
| /* Restore current process signal mask. */ |
| static inline int |
| __libc_signal_restore_set (const sigset_t *set) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL, |
| _NSIG / 8); |
| } |
| |
| /* Used to communicate with signal handler. */ |
| extern struct xid_command *__xidcmd attribute_hidden; |