结构体in_addr的定义是什么呢？我在网上搜索到两个 struct in_addr { unsigned long s_addr; }; typedef struct in_addr { union { struct { UCHAR s_b1,s_b2,s_b3,s_b4; } S_un_b; struct { USHORT s_w1,s_w2; } S_un_w; ULONG S_addr; } S_un; #define s_addr S_un.S_addr /* can be used for most tcp & ip code */ #define s_host S_un.S_un_b.s_b2 ...

addr=${1:-`whoami`} 这怎么解释？ 与addr=`whoami`有什么区别？

我做了一个这样的实验，请各位帮我验证一下： 三台电脑，A：10.1.5.236(网关) ，B:10.1.5.3，C:10.1.5.89，从C 80端口出去的包经A转发到C，我在C电脑上面输入:http://10.1.5.236，没有什么反应，规则我是这样写的： iptables -t nat -A PREROUTING -p tcp -d 10.1.5.236 --dport 80 -j DNAT --to-destination 10.1.5.3:80 我是这样认为的，由于在同一个网段，所以没有做源地址转换，不知道思路是否正确？请高手指点。

为何编译时出现"storage size of 'addr' isn't knonw

[code]#! /usr/bin/perl use strict; # 使用 IO::Socket 模組 use IO::Socket; # 取得命令列中的網頁位址，放入 $url 中 my $url=shift || die "您沒有輸入 url 網址!\n"; # 比對網頁位址是否合乎格式？ my ($host, $file) = $url =~ m!http://([^/]+)(/[^\#]*)!; #(註1) # 若比對正確，才抓取 if ($host) { # 產生一個 IO::Socket::INET 物件 my $socket = IO::Socket::INET->new( Peeraddr => $host, # 指定主機位址...

Ask diag: when ypinit -m problem is as follow: warning: Group writable directory /var/yp/baseband.ut dbm map "Alias0":unsafe map file /var/yp/baseband.ut/mail.aliases: No such file or directory Cannnot create database for alias file /var/yp/baseband.ut/mail.aliases ***Error code 71 How to fix it?

installing oracle8.17 for inter 安装过程中到： installing askjdkhome1.0时；提示： cann't found /usr/local/java/java1.2.2 what can i do now?

installing oracle8.17 for inter 安装过程中到： installing askjdkhome1.0时；提示： cann't found /usr/local/java/java1.2.2 what can i do now?

[code]#include #include #include #include int main(void) { const char *address = "192.168.10.66"; struct sockaddr_in addr; inet_aton(address, &addr.sin_addr); printf("IP addr : %u\n", addr.sin_addr); [/code] 编译的时候总是提示类型不对，把%u换成%d也不行，不知道这里应该用什么格式字符？

int pstat.h typedef struct psinfo { uintptr_t pr_addr; /* address of process */ } other attributes are all right,but this one is zero'0' Does anybody know ? I'm working in the english model,so i just can't issue this problem in chinese! sorry!!