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The <netinet/in.h> header defines the following types through typedef:
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in_port_t
- An unsigned integral type of exactly 16 bits.
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in_addr_t
- An unsigned integral type of exactly 32 bits. The <netinet/in.h> header defines the in_addr structure that includes the following member:
The <netinet/in.h> header defines the in_addr structure that includes the following member:
The <netinet/in.h> header defines the type sa_family_t as described in socket(3HEAD).
The <netinet/in.h> header defines the following macros for use as values of the level argument of getsockopt() and setsockopt():
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IPPROTO_IP
- Dummy for IP
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IPPROTO_ICMP
- Control message protocol
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IPPROTO_TCP
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TCP
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IPPROTO_UDP
- User datagram protocol The <netinet/in.h> header defines the following macros for use as destination addresses for connect(), sendmsg(),
and sendto():
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INADDR_ANY
- Local host address
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INADDR_BROADCAST
- Broadcast address
The <netinet/in.h> header defines the sockaddr_in structure that is used to store addresses for the Internet protocol family. Values of this type must be cast to struct sockaddr for use with the socket
interfaces.
Default
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For applications that do not require standard-conforming behavior (those that use the socket interfaces described in section (3SOCKET) of the reference manual; see Intro(3) and standards(5)), the <netinet/in.h> header defines the sockaddr_in structure that includes the following
members:
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sa_family_t sin_family
in_port_t sin_port
struct in_addr sin_addr
char sin_zero[8]
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Standard conforming
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For applications that require standard-conforming behavior (those that use the socket interfaces described in section (3XNET) of the reference manual; see Intro(3) and standards(5)), the <netinet/in.h> header defines the sockaddr_in structure that includes the following members:
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sa_family_t sin_family
in_port_t sin_port
struct in_addr sin_addr
unsigned char sin_zero[8]
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