recv error: Function is not available 0 251

[moorthyp]

Hello all,

I have a query

i have written one small program .it will send and recv data continously.
My problem is:-
1.if i run this same program in linux .its working fine but if i run in HP-UX11iv1(PARISC) machine .i am getting following error

"recv error: Function is not available 0 251"

can u tell me .is it server regarding issue ?
how to fix this one?

Thanks in advance

Regards,
Moorthy

[Sandman!]

Make sure you are compiling with the proper include files and libraries. Could you post the program here (if it isn't big) as that might help in troubleshooting it.

[moorthyp]

this is my code
can u tell me is there any mistake

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
fd_set rd_set;
fd_set wr_set;
fd_set er_set;
int maxFds = 16;

using namespace std;

#define PKT_LEN 1124
#define PORT_NUM 1707

int main ()
{
int nSocket, sockFd;
unsigned char *pktBuf = new unsigned char[PKT_LEN];
struct sockaddr_in serv, cli;
struct sockaddr fromAddr;
int fromLen = sizeof (fromAddr);
int clilen = sizeof (cli);

int bytesReceived;
int pktsRecvd = 1;
int pktsSent = 1;
int selRet;
// struct protoent *ptent;
//
// ptent = getprotobyname ("TCP");
// printf ("TCP PROTOCOL No. %d - %s\n", ptent->p_proto, ptent->p_name);
if ( (nSocket = socket(AF_INET, SOCK_STREAM, 6)) < 0) {
perror ("socket error");
return -1;
}
cout << "Socket# " << nSocket << endl;

memset(&serv, 0, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = htonl(INADDR_ANY);
serv.sin_port = htons(PORT_NUM);

if (bind(nSocket, (struct sockaddr *)&serv, sizeof(serv)) < 0) {
perror ("bind error");
return -1;
}

if (listen(nSocket, SOMAXCONN) < 0) {
perror ("listen error");
return -1;
}
//clilen = sizeof(cli);
if ((sockFd = accept(nSocket, (struct sockaddr *)&cli,(socklen_t *)&clilen )) < 0) {
perror ("accept error");
return -1;
}

FD_ZERO (&rd_set);
FD_ZERO (&wr_set);
FD_ZERO (&er_set);

FD_SET (sockFd, &rd_set);
// FD_SET (sockFd, &wr_set);
// FD_SET (sockFd, &er_set);

while (1)
{

// if ((bytesReceived = recvfrom (sockFd, pktBuf, 1024,
// 0, &fromAddr, &fromLen)) <= 0)
if ((selRet = select (maxFds, &rd_set, &wr_set, &er_set, NULL)) < 0)
{
perror ("select error");
return -1;
}
cout << "Select returned - " << selRet << endl;

cout << "Checking if Error is set...";
if (FD_ISSET (sockFd, &er_set))
{
perror ("socket error");
return -1;
}
cout << " No error\n";

cout << "Checking if Read is set...";
if (FD_ISSET (sockFd, &rd_set))
{
cout << " Reading\n";
if ((bytesReceived = recv (sockFd, pktBuf, PKT_LEN, 0)) <= 0)
{
perror ("recv error");
cout << bytesReceived << " " << errno << endl;
return -1;
}
cout << bytesReceived << " Bytes reveived\n";
cout << "recvd pkt no. - " << pktsRecvd++ << endl;
FD_CLR (sockFd, &rd_set);
FD_SET (sockFd, &wr_set);
}

cout << "Checking if Write is set...";
if (FD_ISSET (sockFd, &wr_set))
{
fromLen = sizeof (fromAddr);
cout << " Writing\n";
if (send (sockFd, (const void *)pktBuf, bytesReceived, 0) != bytesReceived)
{
perror ("send error");
return -1;
}
cout << "sent pkt no. - " << pktsSent++ << endl;
FD_CLR (sockFd, &wr_set);
FD_SET (sockFd, &rd_set);
}
}
}

[Dennis Handly]

if ((bytesReceived = recv (sockFd, pktBuf, PKT_LEN, 0)) <= 0) {
perror ("recv error");
cout << bytesReceived << " " << errno << endl;

Your error checking on this code is bad. If recv returns 0, you must not call perror nor print errno.

recv(2) says it returns 0 for:
The socket is blocking and the transport connection to the
remote node failed, or the remote side of a connection-based
socket has performed an orderly shutdown and there is no
more data to read (the socket has reached the end of its
data stream). Sockets with the O_NDELAY flag set may also
return 0 at any time when there is no data available.

[moorthyp]

thank u sir.
i will check it and come back to u


Regards
moorthy.p