/* __sig_atomic_t, __sigset_t, and related definitions. Linux version. Copyright (C) 1991, 1992, 1994, 1996, 1997 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/>. */ #ifndef _SIGSET_H_types # define _SIGSET_H_types 1 typedef int __sig_atomic_t; /* A 'sigset_t' has a bit for each signal. * glibc has space for 1024 signals (!), but most arches supported * by Linux have 64 signals, and only MIPS has 128. * There seems to be some historical baggage in sparc[64] * where they might have (or had in the past) 32 signals only, * I hope it's irrelevant now. * Signal 0 does not exist, so we have signals 1..64, not 0..63. * In uclibc, kernel and userspace sigset_t is always the same. * BTW, struct sigaction is also the same on kernel and userspace side. */ #if defined(__mips__) # define _SIGSET_NWORDS (128 / (8 * sizeof (unsigned long))) #else # define _SIGSET_NWORDS (64 / (8 * sizeof (unsigned long))) #endif typedef struct { unsigned long __val[_SIGSET_NWORDS]; } __sigset_t; #endif /* We only want to define these functions if <signal.h> was actually included; otherwise we were included just to define the types. Since we are namespace-clean, it wouldn't hurt to define extra macros. But trouble can be caused by functions being defined (e.g., any global register vars declared later will cause compilation errors). */ #if !defined _SIGSET_H_fns && defined _SIGNAL_H # define _SIGSET_H_fns 1 /* Return a mask that includes the bit for SIG only. */ /* Unsigned cast ensures shift/mask insns are used. */ # define __sigmask(sig) \ (((unsigned long) 1) << ((unsigned)((sig) - 1) % (8 * sizeof (unsigned long)))) /* Return the word index for SIG. */ # define __sigword(sig) ((unsigned)((sig) - 1) / (8 * sizeof (unsigned long))) /* gcc 4.3.1 is not clever enough to optimize for _SIGSET_NWORDS == 1 and 2, * which are about the only values which can be there */ # if defined __GNUC__ && __GNUC__ >= 2 # define __sigemptyset(set) \ (__extension__ ({ \ sigset_t *__set = (set); \ if (_SIGSET_NWORDS <= 2) { \ __set->__val[0] = 0; \ if (_SIGSET_NWORDS == 2) \ __set->__val[1] = 0; \ } else { \ int __cnt = _SIGSET_NWORDS; \ while (--__cnt >= 0) __set->__val[__cnt] = 0; \ } \ 0; \ })) # define __sigfillset(set) \ (__extension__ ({ \ sigset_t *__set = (set); \ if (_SIGSET_NWORDS <= 2) { \ __set->__val[0] = ~0UL; \ if (_SIGSET_NWORDS == 2) \ __set->__val[1] = ~0UL; \ } else { \ int __cnt = _SIGSET_NWORDS; \ while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \ } \ 0; \ })) # ifdef __USE_GNU /* The POSIX does not specify for handling the whole signal set in one command. This is often wanted and so we define three more functions here. */ # define __sigisemptyset(set) \ (__extension__ ({ \ long __ret; \ const sigset_t *__set = (set); \ if (_SIGSET_NWORDS == 1) { \ __ret = __set->__val[0]; \ } else if (_SIGSET_NWORDS == 2) { \ __ret = __set->__val[0] | __set->__val[1]; \ } else { \ int __cnt = _SIGSET_NWORDS; \ __ret = __set->__val[--__cnt]; \ while (!__ret && --__cnt >= 0) \ __ret = __set->__val[__cnt]; \ } \ __ret == 0; \ })) # define __sigandset(dest, left, right) \ (__extension__ ({ \ sigset_t *__dest = (dest); \ const sigset_t *__left = (left); \ const sigset_t *__right = (right); \ if (_SIGSET_NWORDS <= 2) { \ __dest->__val[0] = __left->__val[0] & __right->__val[0];\ if (_SIGSET_NWORDS == 2) \ __dest->__val[1] = __left->__val[1] & __right->__val[1];\ } else { \ int __cnt = _SIGSET_NWORDS; \ while (--__cnt >= 0) \ __dest->__val[__cnt] = (__left->__val[__cnt] \ & __right->__val[__cnt]); \ } \ 0; \ })) # define __sigorset(dest, left, right) \ (__extension__ ({ \ sigset_t *__dest = (dest); \ const sigset_t *__left = (left); \ const sigset_t *__right = (right); \ if (_SIGSET_NWORDS <= 2) { \ __dest->__val[0] = __left->__val[0] | __right->__val[0];\ if (_SIGSET_NWORDS == 2) \ __dest->__val[1] = __left->__val[1] | __right->__val[1];\ } else { \ int __cnt = _SIGSET_NWORDS; \ while (--__cnt >= 0) \ __dest->__val[__cnt] = (__left->__val[__cnt] \ | __right->__val[__cnt]); \ } \ 0; \ })) # endif # endif /* These functions needn't check for a bogus signal number -- error checking is done in the non __ versions. */ # if !defined __USE_EXTERN_INLINES || defined __PROVIDE_OUT_OF_LINE_SIGSETFN extern int __sigismember (const __sigset_t *, int); libc_hidden_proto(__sigismember) extern int __sigaddset (__sigset_t *, int); libc_hidden_proto(__sigaddset) extern int __sigdelset (__sigset_t *, int); libc_hidden_proto(__sigdelset) # endif # ifdef __USE_EXTERN_INLINES # undef _EXTERN_INLINE # ifdef __PROVIDE_OUT_OF_LINE_SIGSETFN # define _EXTERN_INLINE # else /* normal case */ /* dropped extern below: otherwise every module with __USE_EXTERN_INLINES * will have its own copy of out-of line function emitted. */ # define _EXTERN_INLINE /*extern*/ __always_inline # endif # define __SIGSETFN(NAME, BODY, CONST) \ _EXTERN_INLINE int \ NAME (CONST __sigset_t *__set, int __sig) \ { \ unsigned long __mask = __sigmask (__sig); \ unsigned __word = __sigword (__sig); \ return BODY; \ } __SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, const) __SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), ) __SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), ) # undef __SIGSETFN # endif # ifdef _LIBC /* It's far too much PITA to __USE_EXTERN_INLINES from within libc. * Especially since we want to inline only calls with const sig, * but __USE_EXTERN_INLINES will inline all calls! */ static __always_inline unsigned long const_sigismember(const __sigset_t *set, int sig) { unsigned long mask = __sigmask(sig); unsigned word = __sigword(sig); return (set->__val[word] & mask); } # define __sigismember(set, sig) \ (__builtin_constant_p(sig) ? (const_sigismember(set, sig) != 0) : __sigismember(set, sig)) static __always_inline void const_sigaddset(__sigset_t *set, int sig) { unsigned long mask = __sigmask(sig); unsigned word = __sigword(sig); set->__val[word] |= mask; } # define __sigaddset(set, sig) \ (__builtin_constant_p(sig) ? (const_sigaddset(set, sig), 0) : __sigaddset(set, sig)) static __always_inline void const_sigdelset(__sigset_t *set, int sig) { unsigned long mask = __sigmask(sig); unsigned word = __sigword(sig); set->__val[word] &= ~mask; } # define __sigdelset(set, sig) \ (__builtin_constant_p(sig) ? (const_sigdelset(set, sig), 0) : __sigdelset(set, sig)) # endif #endif /* ! _SIGSET_H_fns. */