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Diffstat (limited to 'sysdeps/generic/sigset.h')
| -rw-r--r-- | sysdeps/generic/sigset.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/sysdeps/generic/sigset.h b/sysdeps/generic/sigset.h new file mode 100644 index 0000000000..bc56d96daf --- /dev/null +++ b/sysdeps/generic/sigset.h @@ -0,0 +1,79 @@ +/* __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. */ |