This document contains code snippets for configuring network services and sockets for an iOS application. It sets the network service type to VoIP, defines a keep alive handler with a timeout of 600 seconds for the application, and creates an input stream from a socket file descriptor.

21. [stream setProperty:NSStreamNetworkServiceTypeVoIP
forKey:NSStreamNetworkServiceType];

22. [[UIApplication sharedApplication]
setKeepAliveTimeout:600
handler:^{ // }];

23. [[UIApplication sharedApplication]
setKeepAliveTimeout:600
handler:^{ // }];

24. [[UIApplication sharedApplication]
setKeepAliveTimeout:600
handler:^{ // }];

27. int fd = socket(AF_INET, SOCK_STREAM, 0);
NSInputStream* stream;
CFStreamCreatePairWithSocket(
kCFAllocatorDefault, fd,
(CFReadStreamRef*)&stream, NULL
);

28. int fd = socket(AF_INET, SOCK_STREAM, 0);
NSInputStream* stream;
CFStreamCreatePairWithSocket(
kCFAllocatorDefault, fd,
(CFReadStreamRef*)&stream, NULL
);