PROLOG

       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.

NAME

       arpa/inet.h — definitions for internet operations

SYNOPSIS

       #include <arpa/inet.h>

DESCRIPTION

       The  <arpa/inet.h>  header  shall define the in_port_t and in_addr_t types as described in
       <netinet/in.h>.

       The  <arpa/inet.h>  header  shall  define  the   in_addr   structure   as   described   in
       <netinet/in.h>.

       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.

           uint32_t htonl(uint32_t);
           uint16_t htons(uint16_t);
           uint32_t ntohl(uint32_t);
           uint16_t ntohs(uint16_t);

       The  <arpa/inet.h>  header  shall  define  the uint32_t and uint16_t types 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.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <inttypes.h>, <netinet_in.h>

       The System Interfaces volume of POSIX.1‐2017, htonl(), inet_addr(), inet_ntop()

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       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 .