arpa/inet.h

从man手册获取到的inet.h信息。在linux下网络编程程中常用头文件，主要是信息转换，将客户端信息，转换为字符串信息。

<arpa/inet.h>(0P)         POSIX Programmer's Manual        <arpa/inet.h>(0P)

NAME
       arpa/inet.h - definitions for internet operations

SYNOPSIS
       #include <arpa/inet.h>

DESCRIPTION
       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  sym‐
       bols from <netinet/in.h> and <inttypes.h>.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <netinet/in.h>,   <inttypes.h>,   the  System  Interfaces  volume  of
       IEEE Std 1003.1-2001, htonl(), inet_addr()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol‐
       ogy -- 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 .