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#include <arpa/inet.h>
The <arpa/inet.h> header defines the type in_port_t, the type in_addr_t, and the in_addr structure, as described in in.h(3HEAD).
Inclusion of the <arpa/inet.h> header may also make visible all symbols from in.h(3HEAD).
The following are declared as functions, and may also be defined as macros:
in_addr_t inet_addr(const char *); in_addr_t inet_lnaof(struct in_addr); struct in_addr inet_makeaddr(in_addr_t, in_addr_t); in_addr_t inet_netof(struct in_addr); in_addr_t inet_network(const char *); char *inet_ntoa(struct in_addr);
For applications that do not require standard-conforming behavior (those that use the socket interfaces described in section 3N of the reference manual; see Intro(3) and standards(5)), the following may be declared as functions, or defined as macros, or both:
uint32_t htonl(uint32_t); uint16_t htons(uint16_t); uint32_t ntohl(uint32_t); uint16_t ntohs(uint16_t);
For applications that require standard-conforming behavior (those that use the socket interfaces described in section 3XN of the reference manual; see Intro(3) and standards(5)), the following may be declared as functions, or defined as macros, or both:
in_addr_t htonl(in_addr_t); in_port_t htons(in_port_t); in_addr_t ntohl(in_addr_t); in_port_t ntohs(in_port_t);
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Standard |
Intro(3), htonl(3SOCKET), htonl(3XNET), inet_addr(3SOCKET), inet_addr(3XNET), in.h(3HEAD), attributes(5), standards(5)