CODEWITHSUNDEEP
iphonesocketstcpnsstream
gkedmi
gkedmi

Reputation: 61

how to disable Nagle algorithm on TCP connection on iPhone

I'm building a socket , using 


CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault,
                                       (CFStringRef) yourHostAsNSString,
                                       yourPortAsInteger,
                                       &myReadStream,
                                       &myWriteStream);
and I see that when I send a messages with "myWriteStream" it concatenate few message together and then send them. I think it happens because of the Nagle algorithm and I want to disable it. Does any one knows how to do it?

Upvotes: 6

Views: 4845

Answers (1)

Steve Madsen
Steve Madsen

Reputation: 13791

No guarantee this will fix your problem, but if you want to disable the Nagle algorithm, you need to get the native socket from the stream and call setsockopt.

CFDataRef nativeSocket = CFWriteStreamCopyProperty(myWriteStream, kCFStreamPropertySocketNativeHandle);
CFSocketNativeHandle *sock = (CFSocketNativeHandle *)CFDataGetBytePtr(nativeSocket);
setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, &(int){ 1 }, sizeof(int));
CFRelease(nativeSocket);

(Shout out to Mike Ash for the compound literal trick.)

Upvotes: 6

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