为什么这段代码在FreeBSD上不work? (编译没问题) - 未名空间MITBBS历史存档

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为什么这段代码在FreeBSD上不work? (编译没问题)

为什么这段代码在FreeBSD上不work? (编译没问题)# Unix - 噫吁兮，危乎高哉

n*l2001-06-04 07:06

1 楼

下面这段代码在Linux Red Hat上run得很好，可是在FreeBSD上run
了
之后一点反应都没有。究竟是什么问题呢？谢谢了先。
isock = socket (AF_INET, SOCK_RAW, IPROTO_ICMP);
tsock = socket (AF_INET, SOCK_RAW, IPROTO_TCP);
usock = socket (AF_INET, SOCK_RAW, IPROTO_UDP);
if (isock < 0 || tsock < 0 || usock < 0) {
exit(0);
}
while (1) {
FD_ZERO (&rfds);
FD_SET (isock, &rfds);
FD_SET (usock, &rfds);
FD_SET (tsock, &rfds);
if (select (usock + 1, &rfds, NULL, NULL, NULL) < 1) {
perror("select");
continue;
}

w*n2001-06-04 07:06

2 楼

Here is an excerpt from linux raw(7):
Raw sockets may tap all IP protocols in Linux, even prot
cols like ICMP or TCP which have a protocol module in the
kernel. In this case the packets are passed to both the
kernel module and the raw socket(s). This should not be
relied upon in portable programs, many other BSD socket
implementation have limitations here.
There are detailed explanations in UNP.

【在 n***l 的大作中提到】

: 下面这段代码在Linux Red Hat上run得很好，可是在FreeBSD上run
: 了
: 之后一点反应都没有。究竟是什么问题呢？谢谢了先。
: isock = socket (AF_INET, SOCK_RAW, IPROTO_ICMP);
: tsock = socket (AF_INET, SOCK_RAW, IPROTO_TCP);
: usock = socket (AF_INET, SOCK_RAW, IPROTO_UDP);
: if (isock < 0 || tsock < 0 || usock < 0) {
: exit(0);
: }
: while (1) {