信号的一点基础

#define _NSIG           64
#define _NSIG_BPW       64
#define _NSIG_WORDS     (_NSIG / _NSIG_BPW)

typedef unsigned long old_sigset_t;             /* at least 32 bits */

typedef struct {
        unsigned long sig[_NSIG_WORDS];
} sigset_t;