pSOSystem System Calls - Read

pNA+ System Calls sendto
MSG_DONTROUTE Specifies that you want sendto() to turn on
the socket flag SO_DONTROUTE for the duration
of the send operation. The SO_DONTROUTE flag
prohibits routing of outgoing data from the
socket. Packets directed at unconnected nodes
are dropped.
MSG_RAWMEM Specifies that you have set buf to point to a
linked list of mblks and len to the total size of
the message.
MSG_INTERFACE Specifies the outgoing interface of the message.
If no route is found to the destination, then the
interface number is specified in the argument
to, which is a pointer to the structure
sockaddr_intf. This is supported only for datagram
or raw sockets. This is helpful with unnumbered
links where there may not be a route
to the destination.
to Specifies the destination socket address and is a pointer to either the
sockaddr_in structure or the sockaddr_intf structure.
sockaddr_intf is used only if the MSG_INTERFACE option is set in
flags. These structures are defined in and have 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 */
};
struct sockaddr_intf {
short sin_family; /* must be AF_INET */
unsigned short sin_port; /* 16-bit port number */
struct in_addr sin_addr; /* 32-bit IP address */
long sin_ifno; /* 32-bit interface number */
char sin_zero[4]; /* must be 0 */
};
The field sin_ifno identifies the interface number of the outgoing
packet's output interface.
The above structures cannot be packed.
tolen Specifies the size in bytes of either struct sockaddr_in or struct
sockaddr_intf and must be 16.
pSOSystem System Calls 4-63
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