int pipe(int fildes[2])
{
int tcp1, tcp2;
sockaddr_in name;
memset(&name, 0, sizeof(name));
name.sin_family = AF_INET;
name.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
int namelen = sizeof(name);
tcp1 = tcp2 = -1;
int tcp = socket(AF_INET, SOCK_STREAM, 0);
if (tcp == -1){
goto clean;
}
if (bind(tcp, (sockaddr*)&name, namelen) == -1){
goto clean;
}
if (listen(tcp, 5) == -1){
goto clean;
}
if (getsockname(tcp, (sockaddr*)&name, &namelen) == -1){
goto clean;
}
tcp1 = socket(AF_INET, SOCK_STREAM, 0);
if (tcp1 == -1){
goto clean;
}
if (-1 == connect(tcp1, (sockaddr*)&name, namelen)){
goto clean;
}
tcp2 = accept(tcp, (sockaddr*)&name, &namelen);
if (tcp2 == -1){
goto clean;
}
if (closesocket(tcp) == -1){
goto clean;
}
fildes[0] = tcp1;
fildes[1] = tcp2;
return 0;
clean:
if (tcp != -1){
closesocket(tcp);
}
if (tcp2 != -1){
closesocket(tcp2);
}
if (tcp1 != -1){
closesocket(tcp1);
}
return -1;
}
缺點(diǎn)很明顯
1、效率低下。
2、占用了兩個(gè)TCP端口。
3、accept的返回值未必就是tcp1連接過(guò)來(lái)的(多線程或者別的進(jìn)程在干預(yù))， 所以最好通過(guò)發(fā)送數(shù)據(jù)進(jìn)行確認(rèn)。
4、由于不是匿名的， 所以可以在netstat里面看到。
優(yōu)點(diǎn)只有一個(gè), 可以使用select調(diào)用。