我有一些看起来像这样的代码:
switch (option) {
case MVM_SO_BROADCAST:
case MVM_SO_KEEPALIVE:
case MVM_SO_REUSEADDR:
case MVM_SO_DONTROUTE:
case MVM_SO_SNDBUF:
case MVM_SO_RCVBUF:
case MVM_SO_OOBINLINE:
case MVM_TCP_NODELAY: {
int input;
len = sizeof(int);
e = getsockopt(s, SOL_SOCKET, (int)option, (char *)&input, &len);
output = input;
break;
}
case MVM_SO_LINGER: {
struct linger input;
len = sizeof(struct linger);
e = getsockopt(s, SOL_SOCKET, (int)option, (char *)&input, &len);
// Match Java's behaviour with SO_LINGER
output = (input.l_onoff >= 0) ? input.l_linger : -1;
break;
}
default:
MVM_exception_throw_adhoc(tc, "this socket option is not supported by MoarVM: %d", (int)option);
break;
}
MVM_SO_BROADCAST
等是SO_BROADCAST
等的宏。在开关的默认情况下,我要打印给定的套接字选项的名称,而不是其值,这对最终用户是无用的。 libc中是否有为此功能的功能?