#define sigemptyset(set) (*(set) = 0, 0)
这是什么意思?
struct sigaction new_sa; sigemptyset(&new_sa.sa_mask); struct sigaction { //... sigset_t sa_mask; /* signal mask to apply */ //... }; typedef __darwin_sigset_t sigset_t; typedef __uint32_t __darwin_sigset_t typedef unsigned int __uint32_t;