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This is an IP address that is used when we don’t want to bind a socket to any specific IP. Basically, while implementing communication, we need to bind our socket to an IP address. When we don’t know the IP address of our machine, we can use the special IP address INADDR_ANY .There are several special addresses: INADDR_LOOPBACK (127.0. 0.1) always refers to the local host via the loopback device; INADDR_ANY (0.0. 0.0) means any address for binding; INADDR_BROADCAST (255.255. 255.255) means any host and has the same effect on bind as INADDR_ANY for historical reasons.or by my_sockaddress.sin_addr.s_addr=htonl(INADDR_LOOPBACK); ~ Answered on 2013-08-15 10:35:08. 4. INADDR_ANY instructs listening socket to bind to all available interfaces. It’s the same as trying to bind to inet_addr(“0.0.0.0”) .
Where is Inaddr_any defined?
There are several special addresses: INADDR_LOOPBACK (127.0. 0.1) always refers to the local host via the loopback device; INADDR_ANY (0.0. 0.0) means any address for binding; INADDR_BROADCAST (255.255. 255.255) means any host and has the same effect on bind as INADDR_ANY for historical reasons.
What is Htonl Inaddr_any?
or by my_sockaddress.sin_addr.s_addr=htonl(INADDR_LOOPBACK); ~ Answered on 2013-08-15 10:35:08. 4. INADDR_ANY instructs listening socket to bind to all available interfaces. It’s the same as trying to bind to inet_addr(“0.0.0.0”) .
Socket Programming Tutorial In C For Beginners | Part 1 | Eduonix
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What is S_addr?
s_addr is variable that holds the information about the address we agree to accept. So, in this case i put INADDR_ANY because i would like to accept connections from any internet address. This case is used about server example. In a client example i could NOT accept connections from ANY ADDRESS.
What is listen in socket programming?
General description. The listen() function applies only to stream sockets. It indicates a readiness to accept client connection requests, and creates a connection request queue of length backlog to queue incoming connection requests. Once full, additional connection requests are rejected. Parameter Description socket.
What is Socklen_t in C?
DESCRIPTION. <sys/socket. h> makes available a type, socklen_t, which is an unsigned opaque integral type of length of at least 32 bits. To forestall portability problems, it is recommended that applications should not use values larger than 232 – 1.
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 do Htons do?
The htons function takes a 16-bit number in host byte order and returns a 16-bit number in network byte order used in TCP/IP networks (the AF_INET or AF_INET6 address family). The htons function can be used to convert an IP port number in host byte order to the IP port number in network byte order.
See some more details on the topic what is inaddr_any here:
8.1 The IP address INADDR_ANY
In the simulator, INADDR_ANY has the following semantics: When receiving, a socket bound to this address receives packets from all interfaces. For example, …
ip(7) – Linux manual page – man7.org
When INADDR_ANY is specified in the bind call, the socket will be bound to all local interfaces. When listen(2) is called on an unbound …
Example 2-18 Bind Port Number to Socket
Specifying an address of INADDR_ANY or a port number of 0 is known as wildcarding. The wildcard address simplifies local address binding in the Internet …
Understanding INADDR_ANY for socket programming
Best Solution · bind() of INADDR_ANY does NOT “generate a random IP”. · For a server, you typically want to bind to all interfaces – not just “localhost”. · If you …
What is bind in socket programming?
The bind() function binds a unique local name to the socket with descriptor socket. After calling socket(), a descriptor does not have a name associated with it. However, it does belong to a particular address family as specified when socket() is called. The exact format of a name depends on the address family.
What is bind return C?
RETURN VALUE
Upon successful completion, bind() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.
What is Sa_data?
The meaning of sa_data depends on the value of sa_family. Different network addressing schemes have different ways of representing addresses. sa_data is just 14 bytes of space into which an address can be packed.
What is In_port_t?
in_port_t. An unsigned integral type of exactly 16 bits. in_addr_t. An unsigned integral type of exactly 32 bits. The <netinet/in.h> header defines the in_addr structure that includes at least the following member: in_addr_t s_addr.
What is Sin_family in socket programming?
sin_family. The address family for the transport address. This member should always be set to AF_INET. sin_port.
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What is listen API?
All the listen() API does is tell the system that we’re willing to accept incoming connections. In other words, it turns this socket into a ‘server socket’. The ‘back_log’ parameter tells the system how many clients will be queued up to wait for our server program.
What is backlog in socket listen?
The backlog has an effect on the maximum rate at which a server can accept new TCP connections on a socket. The rate is a function of both the backlog value and the time that connections stay on the queue of partially open connections.
Is listen a blocking call?
listen() is non-blocking.
What type is Socklen_t?
socklen_t – an unsigned opaque integer type of length of at least 32-bits.
Why socket programming is used?
Socket programs are used to communicate between various processes usually running on different systems. It is mostly used to create a client-server environment. This post provides the various functions used to create the server and client program and an example program.
What is application socket?
A socket is one endpoint of a two way communication link between two programs running on the network. The socket mechanism provides a means of inter-process communication (IPC) by establishing named contact points between which the communication take place.
What is So_keepalive?
The SO_KEEPALIVE socket option is designed to allow an application to enable keep-alive packets for a socket connection. To query the status of this socket option, call the getsockopt function. To set this option, call the setsockopt function with the following parameters.
What is Tcp_cork?
UDP_CORK (since Linux 2.5.44) If this option is enabled, then all data output on this socket is. accumulated into a single datagram that is transmitted when the. option is disabled. This option should not be used in code.
What does Sol_socket mean?
SOL_SOCKET is the socket layer itself. It is used for options that are protocol independent.
What does Htons stand for?
htons is host-to-network short. This means it works on 16-bit short integers. i.e. 2 bytes. This function swaps the endianness of a short.
Socket Programming in C, C++ Part 2 (socket, bind, about sockaddr_in, listen etc)
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What is the use of Htons in C?
The htons() function translates a short integer from host byte order to network byte order. The unsigned short integer to be put into network byte order. Is typed to the unsigned short integer to be put into network byte order.
What is NTOH?
The hton / ntoh functions convert between network order and host order. If these two are the same (i.e., on big-endian machines) these functions do nothing. So they cannot be portably relied upon to swap endianness.
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