<span style="color: #0000ff">#define MAXLINE 80

<span style="color: #0000ff">char *socket_path = <span style="color: #800000">"<span style="color: #800000">server.socket<span style="color: #800000">"<span style="color: #000000">;

<span style="color: #0000ff">int main(<span style="color: #0000ff">void<span style="color: #000000">)
{
<span style="color: #0000ff">struct<span style="color: #000000"> sockaddr_un serun,cliun;
socklen_t cliun_len;
<span style="color: #0000ff">int<span style="color: #000000"> listenfd,connfd,size;
<span style="color: #0000ff">char<span style="color: #000000"> buf[MAXLINE];
<span style="color: #0000ff">int<span style="color: #000000"> i,n;

</span><span style="color: #0000ff"&gt;if</span> ((listenfd = socket(AF_UNIX,SOCK_STREAM,<span style="color: #800080"&gt;0</span>)) < <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;) {  
    perror(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;socket error</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
    exit(</span><span style="color: #800080"&gt;1</span><span style="color: #000000"&gt;);  
}  

memset(</span>&amp;serun,<span style="color: #800080"&gt;0</span>,<span style="color: #0000ff"&gt;sizeof</span><span style="color: #000000"&gt;(serun));  
serun.sun_family </span>=<span style="color: #000000"&gt; AF_UNIX;  
strcpy(serun.sun_path,socket_path);  
size </span>= offsetof(<span style="color: #0000ff"&gt;struct</span> sockaddr_un,sun_path) +<span style="color: #000000"&gt; strlen(serun.sun_path);  
unlink(socket_path);  
</span><span style="color: #0000ff"&gt;if</span> (bind(listenfd,(<span style="color: #0000ff"&gt;struct</span> sockaddr *)&amp;serun,size) < <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;) {  
    perror(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;bind error</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
    exit(</span><span style="color: #800080"&gt;1</span><span style="color: #000000"&gt;);  
}  
printf(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;UNIX domain socket boundn</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  

</span><span style="color: #0000ff"&gt;if</span> (listen(listenfd,<span style="color: #800080"&gt;20</span>) < <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;) {  
    perror(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;listen error</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
    exit(</span><span style="color: #800080"&gt;1</span><span style="color: #000000"&gt;);          
}  
printf(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;Accepting connections ...n</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  

</span><span style="color: #0000ff"&gt;while</span>(<span style="color: #800080"&gt;1</span><span style="color: #000000"&gt;) {  
    cliun_len </span>= <span style="color: #0000ff"&gt;sizeof</span><span style="color: #000000"&gt;(cliun);         
    </span><span style="color: #0000ff"&gt;if</span> ((connfd = accept(listenfd,(<span style="color: #0000ff"&gt;struct</span> sockaddr *)&amp;cliun,&amp;cliun_len)) < <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;){  
        perror(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;accept error</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
        </span><span style="color: #0000ff"&gt;continue</span><span style="color: #000000"&gt;;  
    }  

    </span><span style="color: #0000ff"&gt;while</span>(<span style="color: #800080"&gt;1</span><span style="color: #000000"&gt;) {  
        n </span>= read(connfd,buf,<span style="color: #0000ff"&gt;sizeof</span><span style="color: #000000"&gt;(buf));  
        </span><span style="color: #0000ff"&gt;if</span> (n < <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;) {  
            perror(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;read error</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
            </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;  
        } </span><span style="color: #0000ff"&gt;else</span> <span style="color: #0000ff"&gt;if</span>(n == <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;) {  
            printf(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;EOFn</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);  
            </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;  
        }  

        printf(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;received: %s</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;,buf);  

        </span><span style="color: #0000ff"&gt;for</span>(i = <span style="color: #800080"&gt;0</span>; i < n; i++<span style="color: #000000"&gt;) {  
            buf[i] </span>=<span style="color: #000000"&gt; toupper(buf[i]);  
        }  
        write(connfd,n);  
    }  
    close(connfd);  
}  
close(listenfd);  
</span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;;  

}

（编辑：瑞安网）

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