pSOSystem System Calls - Read

ind pNA+ System Calls
bind Binds an address to a socket.
#include
long bind(
int s, /* socket descriptor */
struct sockaddr_in *addr, /* socket structure */
int addrlen /* structure size */
)
Description
Arguments
This system call is used to assign (or bind) an address (a 32-bit internet address
and a 16-bit port number) to a socket. A socket is created without an address and
cannot be used to receive data until it is assigned one. Raw IP sockets are an
exception. If they are unbound then they receive all packets regardless of the
packet’s addresses.
To simplify address binding, a wildcard internet address is supported to free the
user from needing to know the local internet address. It also makes programs more
portable. When the internet address is specified as the symbolic constant
INADDR_ANY, pNA+ interprets it as any valid address. This allows the socket to
receive data regardless of its node's internet address. For example, if a socket is
bound to and it resides on a node that is attached to networks
90.0.0.2 and 100.0.0.3, the socket can receive data addressed to
or .
s Specifies the socket to which the address is bound.
addr Points to a structure of type sockaddr_in that stores the socket
attributes to be bound to the socket. The structure sockaddr_in is
defined in the file and has the following format:
struct sockaddr_in {
short sin_family; /* must be AF_INET */
unsigned short sin_port; /* 16-bit port number */
struct in_addr sin_addr; /* 32-bit IP address */
char sin_zero[8]; /* must be 0 */
};
This structure cannot be packed.
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