c - 如何在 sigset_t 中设置 sa_mask？

Question

海合会 (海湾合作委员会) 4.6.0 c89

我有一个这样声明的信号处理程序:

   /* Setup signal handler */
    struct sigaction new_action;
    new_action.sa_handler = g_signal_handler;
    new_action.sa_flags = SA_ONSTACK;

    if(sigaction(SIGINT, &new_action, NULL) == -1) {
        fprintf(stderr, "Failed to setup signal handlers.");
        return -1;
    }

当我通过 valgrind 运行我的代码时，即 valgrind --leak-check=full 它发现了以下错误:

==5206== Syscall param rt_sigaction(act->sa_mask) points to uninitialised byte(s)
==5206==    at 0x347A435455: __libc_sigaction (in /lib64/libc-2.14.so)

所以在查看手册页后我决定这样设置，只是为了测试:

new_action.sa_mask = SA_NODEFER;

但是，这只会给我以下错误:

error: incompatible types when assigning to type ‘__sigset_t’ from type ‘int’

非常感谢您的任何建议，

Answer 1

试试这个:

/* Signals blocked during the execution of the handler. */
sigemptyset(&new_action.sa_mask);
sigaddset(&new_action.sa_mask, SIGINT);

The sa_mask field allows us to specify a set of signals that aren’t permitted to interrupt execution of this handler. In addition, the signal that caused the handler to be invoked is automatically added to the process signal mask.