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Formerly unix/sysv/sysv4/sigset.h.~3~

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This commit is contained in:
Roland McGrath 1994-02-09 16:59:26 +00:00
parent f4987f8442
commit 30044853c8
1 changed files with 22 additions and 9 deletions
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31
sysdeps/unix/sysv/sysv4/sigset.h
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@ -17,20 +17,32 @@ 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
#ifndef _SIGSET_H_types
#define _SIGSET_H_types 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;
#endif /* ! _SIGSET_H_types */
/* 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. */
#define __sigmask(sig) (1 << ((sig) - 1))
/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */
#define __NSSBITS (sizeof (__sigset_t) * 8)
#define __SSELT(s) ((s) / __NSSBITS)
@ -58,23 +70,24 @@ __sigfillset (__sigset_t *__set)
extern __inline int
__sigaddset (__sigset_t *__set, int __sig)
{
__set->__sigbits[__SSELT (sig)] |= __SSMASK (__sig);
__set->__sigbits[__SSELT (__sig)] |= __SSMASK (__sig);
return 0;
}
extern __inline int
__sigdelset (__sigset_t *__set, int __sig)
{
__set->__sigbits[__SSELT (sig)] &= ~__SSMASK (__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))
if (__set->__sigbits[__SSELT (__sig)] & __SSMASK (__sig))
return 1;
return 0;
}
#endif /* sigset.h */
#endif /* ! _SIGSET_H_fns */