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+/* __sig_atomic_t, __sigset_t, and related definitions. Linux version.
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+ Copyright (C) 1991, 1992, 1994, 1996, 1997 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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 Library General Public License as
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+ published by the Free Software Foundation; either version 2 of the
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+ License, or (at your option) any later version.
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+
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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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+ Library General Public License for more details.
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+
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+ You should have received a copy of the GNU Library General Public
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+ License along with the GNU C Library; see the file COPYING.LIB. If not,
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+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA. */
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+
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+#ifndef _SIGSET_H_types
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+# define _SIGSET_H_types 1
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+
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+typedef int __sig_atomic_t;
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+
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+/* A `sigset_t' has a bit for each signal. */
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+
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+# define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
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+typedef struct
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+ {
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+ unsigned long int __val[_SIGSET_NWORDS];
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+ } __sigset_t;
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+
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+#endif
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+
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+
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+/* We only want to define these functions if <signal.h> was actually
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+ included; otherwise we were included just to define the types. Since we
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+ are namespace-clean, it wouldn't hurt to define extra macros. But
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+ trouble can be caused by functions being defined (e.g., any global
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+ register vars declared later will cause compilation errors). */
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+
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+#if !defined _SIGSET_H_fns && defined _SIGNAL_H
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+# define _SIGSET_H_fns 1
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+
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+# ifndef _EXTERN_INLINE
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+# define _EXTERN_INLINE extern __inline
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+# endif
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+
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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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+ (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
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+
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+/* Return the word index for SIG. */
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+# define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))
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+
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+# if defined __GNUC__ && __GNUC__ >= 2
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+# define __sigemptyset(set) \
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+ (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
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+ sigset_t *__set = (set); \
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+ while (--__cnt >= 0) __set->__val[__cnt] = 0; \
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+ 0; }))
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+# define __sigfillset(set) \
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+ (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
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+ sigset_t *__set = (set); \
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+ while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \
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+ 0; }))
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+
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+# ifdef __USE_GNU
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+/* The POSIX does not specify for handling the whole signal set in one
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+ command. This is often wanted and so we define three more functions
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+ here. */
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+# define __sigisemptyset(set) \
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+ (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
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+ const sigset_t *__set = (set); \
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+ int __ret = __set->__val[--__cnt]; \
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+ while (!__ret && --__cnt >= 0) \
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+ __ret = __set->__val[__cnt]; \
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+ __ret == 0; }))
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+# define __sigandset(dest, left, right) \
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+ (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
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+ sigset_t *__dest = (dest); \
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+ const sigset_t *__left = (left); \
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+ const sigset_t *__right = (right); \
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+ while (--__cnt >= 0) \
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+ __dest->__val[__cnt] = (__left->__val[__cnt] \
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+ & __right->__val[__cnt]); \
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+ 0; }))
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+# define __sigorset(dest, left, right) \
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+ (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
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+ sigset_t *__dest = (dest); \
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+ const sigset_t *__left = (left); \
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+ const sigset_t *__right = (right); \
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+ while (--__cnt >= 0) \
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+ __dest->__val[__cnt] = (__left->__val[__cnt] \
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+ | __right->__val[__cnt]); \
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+ 0; }))
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+# endif
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+# endif
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+
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+/* These functions needn't check for a bogus signal number -- error
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+ checking is done in the non __ versions. */
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+
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+extern int __sigismember (__const __sigset_t *, int);
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+extern int __sigaddset (__sigset_t *, int);
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+extern int __sigdelset (__sigset_t *, int);
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+
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+# ifdef __USE_EXTERN_INLINES
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+# define __SIGSETFN(NAME, BODY, CONST) \
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+ _EXTERN_INLINE int \
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+ NAME (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 BODY; \
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+ }
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+
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+__SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
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+__SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
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+__SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
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+
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+# undef __SIGSETFN
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+# endif
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+
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+
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+#endif /* ! _SIGSET_H_fns. */
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Eric Andersen