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<span style="color: #0000ff">int main(<span style="color: #0000ff">int argc,<span style="color: #0000ff">char *<span style="color: #000000">argv)
{
<span style="color: #0000ff">if(argc < <span style="color: #800080">3<span style="color: #000000">){
server();
}
<span style="color: #0000ff">else<span style="color: #000000">{
client(atoi(argv[<span style="color: #800080">1]),atoi(argv[<span style="color: #800080">2<span style="color: #000000">]));
}
<span style="color: #0000ff">return <span style="color: #800080">0<span style="color: #000000">;
}
<span style="color: #0000ff">void server(<span style="color: #0000ff">void<span style="color: #000000">)
{
union semun sunion;
<span style="color: #0000ff">int<span style="color: #000000"> semid,shmid;
<span style="color: #0000ff">char *<span style="color: #000000">buffer;
semid = safesemget(IPC_PRIVATE,<span style="color: #800080">2,SHM_R|<span style="color: #000000">SHM_W);
deleteSemid =<span style="color: #000000"> semid;
<span style="color: #008000">//<span style="color: #008000"> 在服务器端程序退出时删除掉信号量集。
atexit(&<span style="color: #000000">delete);
signal(SIGINT,&<span style="color: #000000">sigdelete);
<span style="color: #008000">//<span style="color: #008000"> 把第一个信号量设置为 1，第二个信号量设置为 0,<span style="color: #008000">//<span style="color: #008000"> 这样来控制：必须在客户端程序把数据写入共享内存后服务器端程序才能去读共享内存
sunion.val = <span style="color: #800080">1<span style="color: #000000">;
safesemctl(semid,SN_EMPTY,SETVAL,sunion);
sunion.val = <span style="color: #800080">0<span style="color: #000000">;
safesemctl(semid,SN_FULL,sunion);
shmid = safeshmget(IPC_PRIVATE,SHMDATASIZE,IPC_CREAT|SHM_R|<span style="color: #000000">SHM_W);
buffer = safeshmat(shmid,<span style="color: #800080">0,<span style="color: #800080">0<span style="color: #000000">);
safeshmctl(shmid,IPC_RMID,NULL);
<span style="color: #008000">//<span style="color: #008000"> 打印共享内存 ID 和 信号量集 ID，客户端程序需要用它们作为参数
printf(<span style="color: #800000">"<span style="color: #800000">Server is running with SHM id %dn<span style="color: #800000">"<span style="color: #000000">,shmid);
printf(<span style="color: #800000">"<span style="color: #800000">Server is running with SEM id %dn<span style="color: #800000">"<span style="color: #000000">,semid);
<span style="color: #0000ff">while(<span style="color: #800080">1<span style="color: #000000">)
{
printf(<span style="color: #800000">"<span style="color: #800000">Waiting until full...<span style="color: #800000">"<span style="color: #000000">);
fflush(stdout);
locksem(semid,SN_FULL);
printf(<span style="color: #800000">"<span style="color: #800000">done.n<span style="color: #800000">"<span style="color: #000000">);
printf(<span style="color: #800000">"<span style="color: #800000">Message received: %s.n<span style="color: #800000">"<span style="color: #000000">,buffer);
unlocksem(semid,SN_EMPTY);
}
}
<span style="color: #0000ff">void client(<span style="color: #0000ff">int shmid,<span style="color: #0000ff">int<span style="color: #000000"> semid)
{
<span style="color: #0000ff">char *<span style="color: #000000">buffer;
buffer = safeshmat(shmid,<span style="color: #800080">0<span style="color: #000000">);
printf(<span style="color: #800000">"<span style="color: #800000">Client operational: shm id is %d,sem id is %dn<span style="color: #800000">"<span style="color: #000000">,shmid,semid);
<span style="color: #0000ff">while(<span style="color: #800080">1<span style="color: #000000">)
{
<span style="color: #0000ff">char input[<span style="color: #800080">3<span style="color: #000000">];
printf(<span style="color: #800000">"<span style="color: #800000">nnMenun1.Send a messagen<span style="color: #800000">"<span style="color: #000000">);
printf(<span style="color: #800000">"<span style="color: #800000">2.Exitn<span style="color: #800000">"<span style="color: #000000">);
fgets(input,<span style="color: #0000ff">sizeof<span style="color: #000000">(input),stdin);
<span style="color: #0000ff">switch(input[<span style="color: #800080">0<span style="color: #000000">])
{
<span style="color: #0000ff">case <span style="color: #800000">'<span style="color: #800000">1<span style="color: #800000">'<span style="color: #000000">:
clientwrite(shmid,semid,buffer);
<span style="color: #0000ff">break<span style="color: #000000">;
<span style="color: #0000ff">case <span style="color: #800000">'<span style="color: #800000">2<span style="color: #800000">'<span style="color: #000000">:
exit(<span style="color: #800080">0<span style="color: #000000">);
<span style="color: #0000ff">break<span style="color: #000000">;
}
}
}
… （编辑：瑞安网）
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