mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/* Special use of signals in NPTL internals. Linux version.
|
|
Copyright (C) 2014-2017 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>
|
|
|
|
/* 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;
|