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Roland McGrath 1994-02-05 19:31:48 +00:00
parent f5516c0c0c
commit 7e66b0a979
1 changed files with 76 additions and 0 deletions
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sysdeps/unix/sysv/sysv4/sigset.h Normal file
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/* 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
#define _SIGSET_H 1
typedef int __sig_atomic_t;
/* Return a mask that includes SIG only. */
#define __sigmask(sig) (1 << ((sig) - 1))
/* A `sigset_t' has a bit for each signal. */
typedef struct
{
unsigned long int __sigbits[4];
} __sigset_t;
/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */
#define __NSSBITS (sizeof (__sigset_t) * 8)
#define __SSELT(s) ((s) / __NSSBITS)
#define __SSMASK(s) (1 << ((s) % __NSSBITS))
extern __inline int
__sigemptyset (__sigset_t *__set)
{
__set->__sigbits[0] = __set->__sigbits[1] = 0L;
__set->__sigbits[2] = __set->__sigbits[3] = 0L;
return 0;
}
extern __inline int
__sigfillset (__sigset_t *__set)
{
__set->__sigbits[0] = 0x7fffffffL;
__set->__sigbits[1] = __set->__sigbits[2] = __set->__sigbits[3] = 0L;
return 0;
}
extern __inline int
__sigaddset (__sigset_t *__set, int __sig)
{
__set->__sigbits[__SSELT (sig)] |= __SSMASK (__sig);
return 0;
}
extern __inline int
__sigdelset (__sigset_t *__set, int __sig)
{
__set->__sigbits[__SSELT (sig)] &= ~__SSMASK (__sig);
return 0;
}
extern __inline int
__sigismember (__sigset_t *__set, int __sig)
{
if (__set->__sigbits[__SSELT (sig)] & __SSMASK (__sig))
return 1;
return 0;
}
#endif /* sigset.h */