Recv fails when using python sendall in iOS project - iphone

Question

I have a python server that is trying to send a binary file to a client on iOS but 90% of the time the file is incomplete. The receive call on the client fails after receiving about 80% of the file.
This is basically how it's setup.
Server
class ForkingTCPRequestHandler(SocketServer.BaseRequestHandler):
def handle(self):
f = open(TEST_FILE_NAME, 'rb')
file_data = f.read()
self.request.sendall(file_data)
f.close()
class ForkingTCPServer(SocketServer.ForkingMixIn, SocketServer.TCPServer):
pass
if __name__ == '__main__':
try:
server = ForkingTCPServer(('0.0.0.0', 9000), ForkingTCPRequestHandler)
except socket.error as e:
sys.exit(1)
try:
server.serve_forever()
except KeyboardInterrupt:
server.shutdown()
sys.exit(0)
This code works outside of our iOS project (entire file is received)
int receiveFile() {
/* ... */
/* Receive file */
tempBuf = (char*) malloc(sizeof(char)*fileLen);
totalRecv = 0;
recvBytes = 0;
while (totalRecv < fileLen) {
recvBytes = recv(s, tempBuf+totalRecv, 1<<14, 0);
if (recvBytes < 0) {
free(tempBuf);
close(s);
return -1;
}
totalRecv += recvBytes;
}
close(s);
return 0;
}
int connectToServerWithHostname(char *hostname, char *port) {
/* ... */
memset(&targetAddr, 0, sizeof(targetAddr));
targetAddr.sin_family = AF_INET;
targetAddr.sin_port = htons(atoi(port));
bcopy(hostdetails->h_addr, (char *)&targetAddr.sin_addr, hostdetails->h_length);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (socket < 0) {
return -1;
}
rc = connect(sock, (struct sockaddr *)&targetAddr, sizeof(targetAddr));
if (rc < 0) {
close(sock);
return -1;
}
return sock;
}
int main(int argc, char **argv) {
assert(!receiveFile());
return 0;
}
But this equivalent code inside our iOS project fails (partial receive). Even though I'm connecting and receiving the same way as the code above.
while (totalRecv < ntohl(symProcPacket.totalDataLen)) {
recvBytes = recv(s, tempBuf+totalRecv, DEFAULT_SENDRECVSIZE, DEFAULT_SENDRECV_FLAGS);
if (recvBytes < 0) {
debug("Error, could not receive file\n");
free(tempBuf);
errorType = kSymClientErrorReceiving;
goto errorImporting;
}
totalRecv += recvBytes;
printf("Received: %d/%d\n", totalRecv, ntohl(symProcPacket.totalDataLen));
}
Any ideas on why this is failing?
Are sockets different in an iOS project or something?