arpa_inet.h(7POSIX) POSIX Programmer's Manual arpa_inet.h(7POSIX)
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of
this interface may differ (consult the corresponding Linux manual page for details of
Linux behavior), or the interface may not be implemented on Linux.
arpa/inet.h — definitions for internet operations
The <arpa/inet.h> header shall define the in_port_t and in_addr_t types as described in
The <arpa/inet.h> header shall define the in_addr structure as described in
The <arpa/inet.h> header shall define the INET_ADDRSTRLEN and INET6_ADDRSTRLEN macros as
described in <netinet/in.h>.
The following shall be declared as functions, or defined as macros, or both. If functions
are declared, function prototypes shall be provided.
The <arpa/inet.h> header shall define the uint32_t and uint16_t types as described in
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,
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.
The System Interfaces volume of POSIX.1‐2008, htonl(), inet_addr(), inet_ntop()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrep‐
ancy 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have
been introduced during the conversion of the source files to man page format. To report
such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 arpa_inet.h(7POSIX)