diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sigset.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sigset.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sigset.h b/sysdeps/unix/sysv/linux/sigset.h new file mode 100644 index 0000000000..69648b7e9c --- /dev/null +++ b/sysdeps/unix/sysv/linux/sigset.h @@ -0,0 +1,89 @@ +/* __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 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 Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _SIGSET_H_types +#define _SIGSET_H_types 1 + +typedef int __sig_atomic_t; + +/* A `sigset_t' has a bit for each signal. Having 32 * 4 * 8 bits gives + us up to 1024 signals. */ +#define _SIGSET_NWORDS 32 +typedef struct +{ + unsigned int __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 + +#ifndef _EXTERN_INLINE +#define _EXTERN_INLINE extern __inline +#endif + +/* Return a mask that includes the bit for SIG only. */ +#define __sigmask(sig) (((unsigned int) 1) << (((sig) - 1) \ + % (8 * sizeof (unsigned int)))) +/* Return the word index for SIG. */ +#define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned int))) + +#if defined __GNUC__ && __GNUC__ >= 2 +#define __sigemptyset(set) \ + (__extension__ ({ unsigned int __cnt; \ + for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt) \ + (set)->__val[__cnt] = 0; 0; })) +#define __sigfillset(set) \ + (__extension__ ({ unsigned int __cnt; \ + for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt) \ + (set)->__val[__cnt] = ~0; 0; })) +#endif + +/* These functions needn't check for a bogus signal number -- error + checking is done in the non __ versions. */ + +extern int __sigismember (__const __sigset_t *, int); +extern int __sigaddset (__sigset_t *, int); +extern int __sigdelset (__sigset_t *, int); + +#define __SIGSETFN(NAME, BODY, CONST) \ + _EXTERN_INLINE int \ + NAME (CONST __sigset_t *__set, int __sig) \ + { \ + unsigned int __mask = __sigmask (__sig); \ + unsigned int __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 /* ! _SIGSET_H_fns. */ |