我實現了一個套接字客戶端,通過HTTP與RTSP進行通信,從攝像頭獲取視頻。EAGAIN on recv()
爲了與相機建立通信,首先我需要設置HTTP-GET隧道,然後發送RTSP命令。當相機失去連接時,程序必須關閉通道處理程序,完成線程,並且當過程返回到主功能時,它會開始通信(啓動踏板等)。
關於重新連接:http-get隧道設置好,我的意思是,套接字連接並接收「HTTP OK」,因此程序發送RTSP「DESCRIBE」,但recv總是返回EAGAIN錯誤。我用wireshar檢查DESCRIBE OK響應是從攝像機發出的,但是recv從未得到它。
下面是代碼:
struct sockaddr_in aServer;
// string myData;
char *myData=new char [256];
connection *c=(connection*)vargp;
memset(&aServer, 0, sizeof aServer);
aServer.sin_family = AF_INET;
aServer.sin_addr.s_addr = inet_addr(c->theServer.c_str());
if (aServer.sin_addr.s_addr == INADDR_NONE)
{
struct hostent *hp;
hp = gethostbyname(c->theServer.c_str());
if (hp != NULL)
{
memcpy(&aServer.sin_addr, hp->h_addr, hp->h_length);
aServer.sin_family = hp->h_addrtype; //Protocol family
}
else
cout << "Failed to resolve " << c->theServer.c_str() << ": " << hstrerror(h_errno) << endl;
}
aServer.sin_port = htons(c->thePort);
c->fd_get = socket(AF_INET, SOCK_STREAM, 0);
struct timeval timeout;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
setsockopt(c->fd_get, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
if (c->fd_get < 0){
cout << "fd_get < 0" << endl;
c->bFin=true;
c->WakeUP();
}
if (connect(c->fd_get, (struct sockaddr *) &aServer, sizeof aServer) < 0){
cout << "connect fd_get < 0" << endl;
c->bFin=true;
c->WakeUP();
}
if(!c->bFin){
sprintf(myData, "GET %s HTTP/1.1\r\n", c->theURI.c_str());
sprintf(myData, "%sx-sessioncookie: %s\r\nAccept: application/x-rtsp-tunnelled\r\nAuthorization: %s\r\n\r\n", myData,c->theHTTPSessionId.c_str(), c->addAuthorization(c->aGlobalUsername, c->aGlobalPassword).c_str());
cout << myData << endl;
write(c->fd_get, myData, strlen(myData));
//LISTENING...
int theLen=1500; //3000;
int ret=0;
unsigned char datosRecibidos[3000];
int flags =fctl(c->fd_get, F_GETFD;
if((flags & O_NONBLOCK) == O_NONBLOCK){
fprint(stderr, "yup, its nonblocking");
}
else{
fprint(stderr, "nope, its blocking");
}
while (c->bFin==false){
ret = read(c->fd_get, ReceivedData, theLen);
// ret= recvfrom(c->fd_get, ReceivedData, theLen, 0, (struct sockaddr *) 0, (socklen_t*)0);
if (ret == 0)
{
cout << "Server closed connection: 0" << endl;
}
else
if (ret == -1){
fprintf (stderr, "\n[%d]: %s %d\n", __LINE__, strerror (errno), errno);
if(errno==107 ||errno==EAGAIN){
cout << "errno" << endl;
c->bFin=true;
c->WakeUP();
cout << "vuelta wakeUP" << endl;
break;// empezar de nuevo
}else{
cout << "errno" << endl;
}
}
else{
//cout << (string)ReceivedData[0]<< endl;
c->ProcessReceivedData(ReceivedData, ret);
usleep(10);
}
}
close(c->fd_get);
c->fd_get = -1;
}
難道是一個超時問題?或堆棧問題?我如何解決它?
在此先感謝您的幫助。最好的祝福。
克里斯蒂娜
什麼名字`EAGAIN`建議你應該嘗試一下呢? – 2011-01-24 01:21:16