What is a Sockaddr?
sockaddr is used as the base of a set of address structures that act like a discriminated union, see the Beej guide to networking. You generally look at the sa_family and then cast to the appropriate address family’s specific address structure.
What is a Sockaddr structure?
sockaddr. The first structure is sockaddr that holds the socket information − struct sockaddr { unsigned short sa_family; char sa_data[14]; }; 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 − …
What is the difference between Sockaddr_in and Sockaddr?
sockaddr_in and sockaddr_in6 are both structures where first member is a sockaddr structure. According to the C standard, the address of a structure and its first member are the same, so you can cast the pointer to sockaddr_in(6) in a pointer to sockaddr .
What is Sockaddr_in in C?
The “sockaddr_in” structure is very commonly used in socket programming in the C programming language. This structure allows you to bind a socket with the desired address so that a server can listen to the clients’ connection requests.
What is the data size of the sockaddr structure?
With IPv4 (what basically everyone in 2005 still uses), the struct s_addr is a 4-byte number that represents one digit in an IP address per byte. (You won’t ever see an IP address with a number in it greater than 255.)
What is a stream socket?
Stream sockets allow processes to communicate using TCP. A stream socket provides bidirectional, reliable, sequenced, and unduplicated flow of data with no record boundaries. After the connection has been established, data can be read from and written to these sockets as a byte stream. The socket type is SOCK_STREAM .
What is a In_addr structure?
Remarks. The in_addr structure is used with IPv4 addresses. The in_addr structure is the IPv4 equivalent of the IPv6-based in6_addr structure. Note The IN_ADDR, PIN_ADDR, and LPIN_ADDR derived structures are only defined on the Windows SDK released with Windows Vista and later.
What is the job of the Connect int Sockfd const struct sockaddr * addr Socklen_t Addrlen function?
int bind(int sockfd, const struct sockaddr *my_addr, socklen_t addrlen); The function bind assigns an address to a socket. This is necessary on the server side so that a port number for the socket is known.
What is Af_inet in socket?
AF_INET is an address family that is used to designate the type of addresses that your socket can communicate with (in this case, Internet Protocol v4 addresses). When you create a socket, you have to specify its address family, and then you can only use addresses of that type with the socket.
Why is In_addr a struct?
The reason struct in_addr exists is because it may be more than just one integer.
What is Af_inet value?
What is AF_UNIX socket?
The AF_UNIX (also known as AF_LOCAL) socket family is used to communicate between processes on the same machine efficiently. Traditionally, UNIX domain sockets can be either unnamed, or bound to a filesystem pathname (marked as being of type socket).
How many sockets can be opened at once?
For most socket interfaces, the maximum number of sockets allowed per each connection between an application and the TCP/IP sockets interface is 65535.