打印函数调用堆栈

static struct {
char *name;
int signum;
int flags; // 0: default handler, >0: catch, <0: ignore
} sig_table[] = {
{"zero", 0, 0 },
{"SIGHUP", SIGHUP, -1},
{"SIGINT", SIGINT, 1},
{"SIGQUIT", SIGQUIT, -1},
{"SIGILL", SIGILL, 1},
{"SIGTRAP", SIGTRAP, -1},
{"SIGABRT", SIGABRT, 1},
{"SIGBUS", SIGBUS, 1},
{"SIGFPE", SIGFPE, -1},
{"SIGKILL", SIGKILL, 0}, // reserved
{"SIGUSR1", SIGUSR1, 2}, // for light flicker
{"SIGSEGV", SIGSEGV, 1},
{"SIGUSR2", SIGUSR2, -1},
{"SIGPIPE", SIGPIPE, -1},
{"SIGALRM", SIGALRM, -1},
{"SIGTERM", SIGTERM, 1}, // for kill
{"SIGSTKFLT", SIGSTKFLT, -1},
//{"SIGCHLD", SIGCHLD, -1},

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