Table of Contents
What is the structure of socket?
The socket data structure defines the socket. During a socket subroutine, the system dynamically creates the socket data structure. The socket address is specified by a data structure that is defined in a header file. See the sockaddr Structure figure (Figure 1) for an illustration of this data structure.
What is the purpose of generic socket address structure struct sockaddr?
The sockaddr_storage type provides a generic socket address structure that is different from struct sockaddr in two ways: If any socket address structures that the system supports have alignment requirements, the sockaddr_storage provides the strictest alignment requirement.
What is socket and its types?
Types of sockets supported by TCP/IP
| Socket type | Protocol |
|---|---|
| SOCK_STREAM | Transmission Control Protocol (TCP) |
| SOCK_DGRAM | User Datagram Protocol (UDP) |
| SOCK_RAW | IP, ICMP, RAW |
What is concurrent server?
A concurrent server accepts a client connection, delegates the connection to a child process of some kind, and immediately signals its availability to receive the next client connection.
Why socket address is needed?
Because the Internet address is always unique to a particular host on a network, the socket address for a particular socket on a particular host is unique. Additionally, because each connection is fully specified by the pair of sockets it joins, every connection between Internet hosts is also uniquely identified.
What is Sockfd?
sockfd is the listening socket descriptor. information about incoming connection is stored in. addr which is a pointer to a local struct sockaddr_in. addrlen is set to sizeof(struct sockaddr_in)
What is Ip_mreq structure?
The ip_mreq structure is the IPv4 equivalent of the IPv6-based ipv6_mreq structure. The imr_interface member can be an interface index. Any IP address in the 0. x.x.x block (first octet of 0) except for the IP address of 0.0. 0.0 is treated as an interface index.
What is iterative and concurrent server?
An iterative server iterates through each client, handling it one at a time. A concurrent server handles multiple clients at the same time. The simplest technique for a concurrent server is to call the fork function, creating one child process for each client.
What is the socket address structure in Unix?
Various structures are used in Unix Socket Programming to hold information about the address and port, and other information. Most socket functions require a pointer to a socket address structure as an argument.
What is the purpose of the sock enum structure?
It is a structure intended to cover the common initial sequence of the members in the address family specific socket address types ( struct sockaddr_un, struct sockaddr_in, struct sockaddr_in6 etc.) The only member that you can rely on struct sockaddr having is a single sa_family_t, indicating the socket address family.
Where is the SA_DataField in the sock struct?
@JordanDavis Actually, the sa_datafield only exists in the generic struct sockaddr. In struct sockaddr_in, the IP address is in sin_addrwhile the port is in sin_port.
What is a generic socket address structure?
This is a generic socket address structure, which will be passed in most of the socket function calls. The following table provides a description of the member fields − It represents an address family.