Disables Nagle's Algorithm on a TCP socket

DisableNaglesAlgorithm.m

// Nagle's algorithm is a means of improving the efficiency of TCP/IP networks by reducing the number of packets that need to
// be sent over the network.
// https://en.wikipedia.org/wiki/Nagle%27s_algorithm

#import <netinet/in.h>
#import <netinet/tcp.h>

@implementation NSStream (DisableNaglesAlgorithm)

- (void)disableNaglesAlgorithmWithError:(NSError **)error {
    CFDataRef data;

    // Get socket data
    if ([self isKindOfClass:[NSOutputStream class]]) {
        data = CFWriteStreamCopyProperty(
            (__bridge CFWriteStreamRef)((NSOutputStream *)self),
            kCFStreamPropertySocketNativeHandle
        );
    } else if ([self isKindOfClass:[NSInputStream class]]) {
        data = CFReadStreamCopyProperty(
            (__bridge CFReadStreamRef)((NSInputStream *)self),
            kCFStreamPropertySocketNativeHandle
        );
    }
    
    // get a handle to the native socket
    CFSocketNativeHandle handle;
    
    CFDataGetBytes(data, CFRangeMake(0, sizeof(CFSocketNativeHandle)), (UInt8 *)&handle);
    CFRelease(data);
    
    // Disable Nagle's algorithm
    
    int err;
    static const int kOne = 1;
    err = setsockopt(handle, IPPROTO_TCP, TCP_NODELAY, &kOne, sizeof(kOne));
    if (err < 0) {
        err = errno;
        *error = [NSError errorWithDomain:NSPOSIXErrorDomain code:errno userInfo:@{
            NSLocalizedDescriptionKey : @"Error disabling Nagle's algorithm"
        }];
    }
}

@end