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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/generic/sigset.h
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diff --git a/sysdeps/generic/sigset.h b/sysdeps/generic/sigset.h
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+/* __sig_atomic_t, __sigset_t, and related definitions. Generic/BSD version.
+Copyright (C) 1991, 1992, 1994 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef _SIGSET_H_types
+#define _SIGSET_H_types 1
+
+typedef int __sig_atomic_t;
+
+/* A `sigset_t' has a bit for each signal. */
+typedef unsigned long int __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 SIG only. The cast to `sigset_t' avoids
+ overflow if `sigset_t' is wider than `int'. */
+#define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1))
+
+#define __sigemptyset(set) ((*(set) = (__sigset_t) 0), 0)
+#define __sigfillset(set) ((*(set) = ~(__sigset_t) 0), 0)
+
+/* These functions must check for a bogus signal number. We detect it by a
+ zero sigmask, since a number too low or too high will have shifted the 1
+ off the high end of the mask. If we find an error, we punt to a random
+ call we know fails with EINVAL (kludge city!), so as to avoid referring
+ to `errno' in this file (sigh). */
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+#define __SIGSETFN(NAME, BODY, CONST) \
+ _EXTERN_INLINE int \
+ __##NAME (CONST __sigset_t *__set, int __sig) \
+ { \
+ if (__sig < 1 || __sig > sizeof (__sigset_t) * 8) \
+ { \
+ extern int raise (int); \
+ return raise (-1); \
+ } \
+ else \
+ { \
+ __sigset_t __mask = __sigmask (__sig); \
+ return BODY; \
+ } \
+ }
+
+__SIGSETFN (sigismember, (*__set & __mask) ? 1 : 0, __const)
+__SIGSETFN (sigaddset, ((*__set |= __mask), 0), )
+__SIGSETFN (sigdelset, ((*__set &= ~__mask), 0), )
+
+#undef __SIGSETFN
+
+
+#endif /* ! _SIGSET_H_fns. */