ref: 994751d39485e086ef623f202fb1b84729fd5d19
dir: /include/bits/darwin/sys/signal.h/
typedef int sig_atomic_t; #define SIG_ERR ((void (*)(int)) -1) #define SIG_DFL ((void (*)(int)) 0) #define SIG_IGN ((void (*)(int)) 1) #define SIGHUP 1 #define SIGINT 2 #define SIGQUIT 3 #define SIGILL 4 #define SIGABRT 6 #define SIGFPE 8 #define SIGKILL 9 #define SIGSEGV 11 #define SIGPIPE 13 #define SIGALRM 14 #define SIGTERM 15 #define SIGSTOP 17 #define SIGTSTP 18 #define SIGCONT 19 #define SIGCHLD 20 #define SIGTTIN 21 #define SIGTTOU 22 #define SIGUSR1 30 #define SIGUSR2 31 #define __NR_SIGNALS 32