In memory, the struct sockaddr_in is the same size as struct sockaddr, and you can freely cast the pointer of one type to the other without any harm, except the possible end of the universe. Now, that struct in_addr is a weird beast on different systems.
Also question is, what is In_addr?
The in_addr structure represents an IPv4 Internet address. When testing return values with inet_pton (using a random IP like 219.225.
Also, 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) accept returns a new socket file descriptor to use for.
Also to know, what is Netinet?
The <netinet/in. h> header also defines the IN6ADDR_LOOPBACK_INIT macro. This macro must be constant at compile time and can be used to initialize a variable of type struct in6_addr to the IPv6 loopback address. The <netinet/in.
What is Sin_zero?
As struct sockaddr_in needs to be cast to struct sockaddr it has to be kept the same size, sin_zero is an unused member whose sole purpose is to pad the structure out to 16 bytes (which is the size of sock_addr). This padding size may vary depending on the address family.
14 Related Question Answers Found
What is socket connection?
A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent to. An endpoint is a combination of an IP address and a port number.
What is Sockaddr_in structure?
The SOCKADDR_IN structure specifies a transport address and port for the AF_INET address family.
What is SYS socket H used for?
The
How many bits are there in a socket address?
The bind() assigns a local protocol address to a socket. With the Internet protocols, the address is the combination of an IPv4 or IPv6 address (32-bit or 128-bit) address along with a 16 bit TCP port number.
What is Ipproto_tcp?
IPPROTO_TCP. Indicates that the TCP protocol is to be used. IPPROTO_UDP. Indicates that the UDP protocol is to be used.
What is Sock_stream?
SOCK_STREAM means that it is a TCP socket. SOCK_DGRAM means that it is a UDP socket. These are used 99% of the time. There are other possibilities as well, see https://docs.python.org/2/library/socket.html#socket.SOCK_STREAM (you will have to google for the meaning of each one).
Why UDP is unreliable protocol?
UDP is a transport layer protocol. UDP is a connectionless and unreliable protocol. UDP does not do flow control, error control or retransmission of a bad segment. Its contains Source port, Destination port, UDP length and Checksum.
What is socket in transport layer?
a socket is the interface through which a process (application) communicates with the transport layer. each process can potentially use many sockets. the transport layer in a receiving machine receives a sequence of segments from its network layer.
Where are sockets used?
A Unix Socket is used in a client server application frameworks. A server is a process which does some function on request from a client. Most of the application level protocols like FTP, SMTP and POP3 make use of Sockets to establish connection between client and server and then for exchanging data.
What is socket and types of socket?
Socket Types. Socket types define the communication properties visible to a user. Three types of sockets are supported: Stream sockets allow processes to communicate using TCP. A stream socket provides bidirectional, reliable, sequenced, and unduplicated flow of data with no record boundaries.
What is file descriptor in Linux?
From Wikipedia, the free encyclopedia. In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
What is listen function in socket programing?
DESCRIPTION. The listen() function marks a connection-mode socket (for example, those of type SOCK_STREAM), specified by the socket argument s, as accepting connections, and limits the number of outstanding connections in the socket’s listen queue to the value specified by the backlog argument.
What is socket return?
The socket() function shall create an unbound socket in a communications domain, and return a file descriptor that can be used in later function calls that operate on sockets. The socket() function takes the following arguments: domain. Specifies the communications domain in which a socket is to be created.
What is the use of bind in socket programming?
Answer: Bind() function in socket programming is used to associate the socket with local address i.e. IP Address, port and address family. int bind(int sockfd,struct sockaddr *servaddr,int addrlength); There could be many combination of IP address and ports e.g. (10.17.