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It puts the server socket in a passive mode, where it waits for the client to approach the server to make a connection. In the example code, we bind the server to the localhost, hence we use INADDR_ANY to specify the IP address.

Int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) Īfter creation of the socket, bind function binds the socket to the address and port number specified in addr(custom data structure). Int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen) Prevents error such as: “address already in use”. This is completely optional, but it helps in reuse of address and port. Setsockopt: This helps in manipulating options for the socket referred by the file descriptor sockfd. This is the same number which appears on protocol field in the IP header of a packet.(man protocols for more details)Ģ.

protocol: Protocol value for Internet Protocol(IP), which is 0.

SOCK_DGRAM: UDP(unreliable, connectionless) SOCK_STREAM: TCP(reliable, connection oriented) For communicating between processes on different hosts connected by IPV4, we use AF_INET and AF_I NET 6 for processes connected by IPV6. We use AF_ LOCAL as defined in the POSIX standard for communication between processes on the same host.

domain: integer, specifies communication domain.

sockfd: socket descriptor, an integer (like a file-handle).

Int sockfd = socket(domain, type, protocol)

Initialize a vector in C++ (6 different ways).

The C++ Standard Template Library (STL).

Types of DNS Attacks and Tactics for Security.

Address Resolution in DNS (Domain Name Server).

Domain Name System (DNS) in Application Layer.

How DHCP server dynamically assigns IP address to a host?.

Dynamic Host Configuration Protocol (DHCP).

Asynchronous Transfer Mode (ATM) in Computer Network.

What are the differences between HTTP, FTP, and SMTP?.

File Transfer Protocol (FTP) in Application Layer.UDP Client Server using connect | C implementation.Socket Programming in C/C++: Handling multiple clients on server without multi threading.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.