Metrologic Optimus R, Руководство по программированию

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150 "C" Programming Guide For Optimus S/R
printf ("Can not get remote name info");
.......................
}
Description This routine returns the name of the peer connected to socket s . It only can be
used on a connected socket. (?)
The name is a result parameter that is filled in with the address of the
connecting entity, as known to the communications layer. The exact
format of the
name
parameter is determined by the address family in
which the communication is occurring.
The namelen is a value-result parameter; it initially contains the amount of
space pointed to by name ; on return, it will contain the actual length, in
bytes, of the address returned. The
name
is truncated if the buffer provided
is too small.
Return If successful, it returns 0.
On error, it returns -1.
The global variable errno is set to indicate the error condition encountered.
See Also connect, getsockname
getsockname
Purpose
To get socket name.
Syntax int getsockname (SOCKET s, struct sockaddr *name, int *namelen);
s Descriptor identifying a socket
name Pointer to a sockaddr structure receiving the local IP address
and port number
namelen Pointer to an integer containing the length of name
Example SOCKET s;
struct sockaddr_in local_name;
int size_of_name;
........................
size_of_name = sizeof (local_name);
if (getsockname (s, (struct sockaddr*) &local_name, &size_of_name) < 0) {
printf ("Can not get local name info");
.......................
}
Description
This routine returns the current name for bound or connected socket
s
. It is
especially useful when a connect() call has been made without doing a bind
first. (?)