IEEE/The Open Group
arpa/inet.h - definitions for internet operations
The in_port_t and in_addr_t types shall be defined as described in <netinet/in.h> .
The in_addr structure shall be defined as described in <netinet/in.h> .
The INET_ADDRSTRLEN and INET6_ADDRSTRLEN macros shall be defined as described in <netinet/in.h> .
The following shall either be declared as functions, defined as macros, or both. If functions are declared, function prototypes shall be provided.
uint32_t htonl(uint32_t); uint16_t htons(uint16_t); uint32_t ntohl(uint32_t); uint16_t ntohs(uint16_t);
The uint32_t and uint16_t types shall be defined as described in <inttypes.h> .
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
in_addr_t inet_addr(const char *); char *inet_ntoa(struct in_addr); const char *inet_ntop(int, const void *restrict, char *restrict, socklen_t); int inet_pton(int, const char *restrict, void *restrict);
Inclusion of the <arpa/inet.h> header may also make visible all symbols from <netinet/in.h> and <inttypes.h>.
The following sections are informative.
<netinet/in.h>, <inttypes.h>, the System Interfaces volume of IEEE Std 1003.1-2001, htonl(), inet_addr()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .