fifo實現單伺服器多客戶端

費勁的折騰，好幾次小細節沒處理好，真是醉了，不說了

**記錄下

服務端:

//fifo(first in, first out)

//有名管道
#include #include #include #include #include #include #include #include #include #include #include using namespace std;
#define file_mode (s_irusr | s_iwusr | s_irgrp | s_iroth)
#define fifo_0 "/tmp/fifo0"
const int size=256;
struct data
;int server(int &readfd,int &writefd);
//server
//作用：多個客戶端通過fifo向server傳來檔案路徑名，server返回路徑名的反序
int main()
readfd=open(fifo_0,o_rdonly,0);
writefd=open(fifo_0,o_wronly,0);
cout << "readfd=" << readfd << endl;
cout << "writefd=" << writefd << endl;
server(readfd,writefd);
return 0;
}int fifo_ret(data & data);
int server(int & readfd,int & writefd)
;    size_t n=0;
size_t len=0;
char sbuf[256]= ;
while(true)
len = data.nlen;
if(read(readfd,&data.pid,sizeof(pid_t)) == sizeof(pid_t) && \
len == read(readfd,data.sbuf,len))
}}void reverse(char * from, char * to)
}int fifo_ret(data & data)
}int writefd;
sleep(3);
if( (writefd=open(pathname,o_wronly,0)) < 0)
perror("open fifo");
char stmp[256]=;
reverse(data.sbuf,stmp);
cout << stmp << endl;
write(writefd,stmp,strlen(stmp));
close(writefd);
}

客戶端:

#include #include #include #include #include #include #include #include #include #include #include using namespace std;

#define file_mode (s_irusr | s_iwusr | s_irgrp | s_iroth)

#define fifo_0 "/tmp/fifo0"

const int size=256;

struct data

;int main()

int readfd,writefd;

char pathname[size]="/tmp/fifo";

int pid=(int)getpid();

char sbuf[256]=;

memset(sbuf,0x00,sizeof(sbuf));

sprintf(sbuf,"%d",pid);

strcat(pathname,sbuf);

if(mkfifo(pathname,file_mode) < 0)

}//多客戶端向服務端傳送字串，伺服器返回反序

writefd=open(fifo_0,o_wronly,0);

sprintf(sbuf,"%d",pid);

char stmp[256]=;

data data;

while(1) //與伺服器通訊

{memset(sbuf,0x00,sizeof(sbuf));

memset(stmp,0x00,sizeof(stmp));

memset(&data,0x00,sizeof(data));

cout << "input:[# quit]" << endl;

cin >> data.sbuf;

if(data.sbuf[0] == '#')

break;

data.pid=pid;

data.nlen=strlen(data.sbuf);

write(writefd,&data,data.nlen+sizeof(data.nlen)+sizeof(data.pid));

readfd=open(pathname,o_rdonly,0);

read(readfd,stmp,sizeof(stmp));

cout << "recv:" <

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