mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-13 00:30:07 +00:00
f26d456b98
The __NSIG_WORDS value is based on minimum number of words to hold the maximum number of signals supported by the architecture. This patch also adds __NSIG_BYTES, which is the number of bytes required to represent the supported number of signals. It is used in syscalls which takes a sigset_t. Checked on x86_64-linux-gnu and i686-linux-gnu. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/* __sigset_t manipulators. Linux version.
|
|
Copyright (C) 1991-2020 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _SIGSETOPS_H
|
|
#define _SIGSETOPS_H 1
|
|
|
|
#include <signal.h>
|
|
#include <limits.h>
|
|
#include <libc-pointer-arith.h>
|
|
|
|
/* Return a mask that includes the bit for SIG only. */
|
|
#define __sigmask(sig) \
|
|
(1UL << (((sig) - 1) % ULONG_WIDTH))
|
|
|
|
/* Return the word index for SIG. */
|
|
static inline unsigned long int
|
|
__sigword (int sig)
|
|
{
|
|
return (sig - 1) / ULONG_WIDTH;
|
|
}
|
|
|
|
/* Linux sig* functions only handle up to __NSIG_WORDS words instead of
|
|
full _SIGSET_NWORDS sigset size. The signal numbers are 1-based, and
|
|
bit 0 of a signal mask is for signal 1. */
|
|
#define __NSIG_WORDS (ALIGN_UP ((_NSIG - 1), ULONG_WIDTH) / ULONG_WIDTH)
|
|
_Static_assert (__NSIG_WORDS <= _SIGSET_NWORDS,
|
|
"__NSIG_WORDS > _SIGSET_WORDS");
|
|
|
|
/* This macro is used on syscall that takes a sigset_t to specify the expected
|
|
size in bytes. As for glibc, kernel sigset is implemented as an array of
|
|
unsigned long. */
|
|
#define __NSIG_BYTES (__NSIG_WORDS * (ULONG_WIDTH / UCHAR_WIDTH))
|
|
|
|
static inline void
|
|
__sigemptyset (sigset_t *set)
|
|
{
|
|
int cnt = __NSIG_WORDS;
|
|
while (--cnt >= 0)
|
|
set->__val[cnt] = 0;
|
|
}
|
|
|
|
static inline void
|
|
__sigfillset (sigset_t *set)
|
|
{
|
|
int cnt = __NSIG_WORDS;
|
|
while (--cnt >= 0)
|
|
set->__val[cnt] = ~0UL;
|
|
}
|
|
|
|
static inline int
|
|
__sigisemptyset (const sigset_t *set)
|
|
{
|
|
int cnt = __NSIG_WORDS;
|
|
int ret = set->__val[--cnt];
|
|
while (ret == 0 && --cnt >= 0)
|
|
ret = set->__val[cnt];
|
|
return ret == 0;
|
|
}
|
|
|
|
static inline void
|
|
__sigandset (sigset_t *dest, const sigset_t *left, const sigset_t *right)
|
|
{
|
|
int cnt = __NSIG_WORDS;
|
|
while (--cnt >= 0)
|
|
dest->__val[cnt] = left->__val[cnt] & right->__val[cnt];
|
|
}
|
|
|
|
static inline void
|
|
__sigorset (sigset_t *dest, const sigset_t *left, const sigset_t *right)
|
|
{
|
|
int cnt = __NSIG_WORDS;
|
|
while (--cnt >= 0)
|
|
dest->__val[cnt] = left->__val[cnt] | right->__val[cnt];
|
|
}
|
|
|
|
static inline int
|
|
__sigismember (const sigset_t *set, int sig)
|
|
{
|
|
unsigned long int mask = __sigmask (sig);
|
|
unsigned long int word = __sigword (sig);
|
|
return set->__val[word] & mask ? 1 : 0;
|
|
}
|
|
|
|
static inline void
|
|
__sigaddset (sigset_t *set, int sig)
|
|
{
|
|
unsigned long int mask = __sigmask (sig);
|
|
unsigned long int word = __sigword (sig);
|
|
set->__val[word] |= mask;
|
|
}
|
|
|
|
static inline void
|
|
__sigdelset (sigset_t *set, int sig)
|
|
{
|
|
unsigned long int mask = __sigmask (sig);
|
|
unsigned long int word = __sigword (sig);
|
|
set->__val[word] &= ~mask;
|
|
}
|
|
|
|
#endif /* bits/sigsetops.h */
|