116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
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/* __sigset_t manipulators. Linux version.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SIGSETOPS_H
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#define _SIGSETOPS_H 1
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#include <signal.h>
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#include <limits.h>
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#include <libc-pointer-arith.h>
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/* Return a mask that includes the bit for SIG only. */
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#define __sigmask(sig) \
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(1UL << (((sig) - 1) % ULONG_WIDTH))
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/* Return the word index for SIG. */
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static inline unsigned long int
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__sigword (int sig)
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{
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return (sig - 1) / ULONG_WIDTH;
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}
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/* Linux sig* functions only handle up to __NSIG_WORDS words instead of
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full _SIGSET_NWORDS sigset size. The signal numbers are 1-based, and
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bit 0 of a signal mask is for signal 1. */
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#define __NSIG_WORDS (ALIGN_UP ((_NSIG - 1), ULONG_WIDTH) / ULONG_WIDTH)
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_Static_assert (__NSIG_WORDS <= _SIGSET_NWORDS,
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"__NSIG_WORDS > _SIGSET_WORDS");
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/* This macro is used on syscall that takes a sigset_t to specify the expected
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size in bytes. As for glibc, kernel sigset is implemented as an array of
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unsigned long. */
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#define __NSIG_BYTES (__NSIG_WORDS * (ULONG_WIDTH / UCHAR_WIDTH))
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static inline void
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__sigemptyset (sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = 0;
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}
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static inline void
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__sigfillset (sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = ~0UL;
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}
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static inline int
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__sigisemptyset (const sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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int ret = set->__val[--cnt];
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while (ret == 0 && --cnt >= 0)
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ret = set->__val[cnt];
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return ret == 0;
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}
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static inline void
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__sigandset (sigset_t *dest, const sigset_t *left, const sigset_t *right)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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dest->__val[cnt] = left->__val[cnt] & right->__val[cnt];
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}
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static inline void
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__sigorset (sigset_t *dest, const sigset_t *left, const sigset_t *right)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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dest->__val[cnt] = left->__val[cnt] | right->__val[cnt];
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}
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static inline int
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__sigismember (const sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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return set->__val[word] & mask ? 1 : 0;
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}
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static inline void
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__sigaddset (sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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set->__val[word] |= mask;
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}
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static inline void
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__sigdelset (sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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set->__val[word] &= ~mask;
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}
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#endif /* bits/sigsetops.h */
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