{"id":657,"date":"2019-05-11T22:21:43","date_gmt":"2019-05-11T13:21:43","guid":{"rendered":"https:\/\/www.oji-koji.com\/?p=657"},"modified":"2021-07-28T10:43:26","modified_gmt":"2021-07-28T01:43:26","slug":"%e5%88%9d%e3%82%81%e3%81%a6%e3%81%aetcp-ip%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0simpleserver%e6%a6%82%e8%a6%81%e3%81%a8%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8bapi","status":"publish","type":"post","link":"https:\/\/www.oji-koji.com\/?p=657","title":{"rendered":"\u521d\u3081\u3066\u306eTCP\/IP\u30d7\u30ed\u30b0\u30e9\u30e0SimpleServer(\u6982\u8981\u3068\u4f7f\u7528\u3059\u308bAPI)"},"content":{"rendered":"\n

TCP\/IP\u3092\u4f7f\u3063\u3066\u901a\u4fe1\u3001\u6587\u5b57\u5217\u3092\u9001\u53d7\u4fe1\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308a\u307e\u3059\u3002
\u6b21\u306e\u56f3\u306e\u3088\u3046\u306a\u4ed5\u7d44\u307f(Server-Client)\u3067\u52d5\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1\u3092\u884c\u3046\u90e8\u5206\u306f\u3001\u5225\u30b9\u30ec\u30c3\u30c9\u3067\u52d5\u304f\u3088\u3046\u306b\u3057\u307e\u3059\u304c
\u5148\u305a\u306f\u5358\u7d14\u306a\u30b5\u30fc\u30d0\/\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u4f5c\u308a\u307e\u3059\u3002
\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u5316\u306a\u3069\u306f\u3001\u5f8c\u7a0b\u3053\u306e\u5358\u7d14\u306a\u30b5\u30fc\u30d0\/\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u5143\u306b\u8003\u3048\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u30b5\u30fc\u30d0\u5074(SimpleServer)
\u6b21\u306e\u3088\u3046\u306a\u6a5f\u80fd\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002
\u8d77\u52d5\u5f15\u6570\uff1a\u5f85\u6a5f\u30dd\u30fc\u30c8\u756a\u53f7
\u3053\u306e\u30dd\u30fc\u30c8\u756a\u53f7\u3067\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u63a5\u7d9a\u8981\u6c42\u304c\u3042\u308c\u3070\u3001\u63a5\u7d9a\u3092\u53d7\u5bb9\u3059\u308b\u3002
\u9001\u4fe1\u3055\u308c\u3066\u304d\u305f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u9001\u4fe1\u3055\u308c\u3066\u304d\u305f\u30c7\u30fc\u30bf\uff08\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\uff09\u3092
\u8868\u793a\u3059\u308b\u3002
\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u4f55\u304b\u5165\u529b\u3055\u308c\u305f\u3089\u7d42\u4e86\u3059\u308b\u3002<\/p>\n\n\n\n

\u3053\u3053\u3067\u4f7f\u7528\u3059\u308b\u30bd\u30b1\u30c3\u30c8API\u306e\u3044\u304f\u3064\u304b\u306f\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u52d5\u4f5c\u3057\u307e\u3059\u3002
\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u52d5\u4f5c\u3059\u308b\u95a2\u6570\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u308b\u307e\u3067\u5236\u5fa1\u3092\u623b\u3057\u307e\u305b\u3093\u3002
\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u898b\u308b\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u56fa\u307e\u3063\u305f\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002
\u30ce\u30f3\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u52d5\u4f5c\u306b\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001Windows, Linux\u3067\u3067\u304d\u308b\u3060\u3051
\u30bd\u30fc\u30b9\u3092\u5171\u901a\u5316\u3059\u308b\u305f\u3081\u306b\u3053\u3053\u3067\u306fselect\u306b\u3088\u308b\u76e3\u8996\u51e6\u7406\u3092\u304a\u3053\u306a\u3046\u3053\u3068\u3067
\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u3059\u308b\u95a2\u6570\u3068\u3001\u5236\u5fa1\u3092\u623b\u3057\u3066\u304f\u308b\u6761\u4ef6
accept \u8ab0\u304b\u304c\u63a5\u7d9a\u306b\u6765\u306a\u3044\u3068\u3001\u95a2\u6570\u547c\u3073\u51fa\u3057\u304b\u3089\u623b\u3063\u3066\u304d\u307e\u305b\u3093\u3002
recv \u4f55\u304b\u53d7\u4fe1\u3059\u308b\u304b\u3001\u5207\u65ad\u3055\u308c\u308b\u304b\u3059\u308b\u307e\u3067\u95a2\u6570\u547c\u3073\u51fa\u3057\u304b\u3089
\u623b\u3063\u3066\u304d\u307e\u305b\u3093\u3002
send \u9001\u4fe1\u5b8c\u4e86(TCP\u306e\u9001\u4fe1\u30d0\u30c3\u30d5\u30a1\u306b\u30c7\u30fc\u30bf\u3092\u66f8\u304d\u7d42\u308f\u308b)\u307e\u3067
\u95a2\u6570\u547c\u3073\u51fa\u3057\u304b\u3089\u623b\u3063\u3066\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n

SimpleServer\u3067\u306f\u3001\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3059\u308b\u95a2\u6570\u3092\u6b21\u306e\u3088\u3046\u306a\u95a2\u6570\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4eca\u56de\u65b0\u305f\u306b\u4f7f\u7528\u3059\u308b\u30bd\u30b1\u30c3\u30c8API\u306b\u3064\u3044\u3066\u307f\u3066\u3044\u304f\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

CreateAndBindSocket\u95a2\u6570\u3067\u306f\u3001\u6b21\u306e\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
SOCKET socket(int af, int type, int protocol);<\/strong>
\u30bd\u30b1\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
\u30b5\u30fc\u30d0\u3067\u306fIPv4, IPv6\u3067\u5f85\u6a5f\u3059\u308b\u305f\u3081\u306e\u30bd\u30b1\u30c3\u30c8\uff08\u8907\u6570\uff09\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
\u901a\u4fe1\u306e\u305f\u3081\u306e\u7aef\u70b9 (endpoint) \u3092\u4f5c\u6210\u3057\u3001 \u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u3092\u8fd4\u3057\u307e\u3059\u3002
af, type, protocol\u306e\u6307\u5b9a\u306b\u306f\u306fgetaddrinfo\u306e\u7d50\u679c\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
int bind(SOCKET sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/strong>
\u30bd\u30b1\u30c3\u30c8\u306b\u540d\u524d (\u30dd\u30fc\u30c8, \u30a2\u30c9\u30ec\u30b9\u3092\u30bd\u30b1\u30c3\u30c8\u306b\u5272\u308a\u5f53\u3066\u308b\uff09\u3092\u4ed8\u3051\u307e\u3059\u3002
\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc sockfd \u3067\u53c2\u7167\u3055\u308c\u308b\u30bd\u30b1\u30c3\u30c8\u306b addr \u3067\u6307\u5b9a\u3055\u308c\u305f
\u30a2\u30c9\u30ec\u30b9\u3001\u30dd\u30fc\u30c8\u3092\u5272\u308a\u5f53\u3066\u307e\u3059
addr\u306fsockaddr_in(IPv4\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831)\u307e\u305f\u306fsockaddr_in6(IPv6\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831)\u3067\u3059\u3002<\/p>\n\n\n\n

DoListen\u95a2\u6570\u3067\u306f\u3001\u6b21\u306e\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
int listen(SOCKET sockfd, int backlog);<\/strong>
\u30bd\u30b1\u30c3\u30c8\u3092\u63a5\u7d9a\u5f85\u6a5f\u72b6\u614b\u306b\u3057\u307e\u3059\u3002
sockfd \u304c\u53c2\u7167\u3059\u308b\u30bd\u30b1\u30c3\u30c8\u3092\u63a5\u7d9a\u5f85\u3061\u30bd\u30b1\u30c3\u30c8 (passive socket) \u72b6\u614b\u306b\u3057\u307e\u3059\u3002
backlog \u5f15\u304d\u6570\u306f\u3001 sockfd \u306b\u3064\u3044\u3066\u306e\u4fdd\u7559\u4e2d\u306e\u63a5\u7d9a\u306e\u30ad\u30e5\u30fc\u306e\u6700\u5927\u9577\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

DoAccept\u95a2\u6570\u3067\u306f\u3001\u6b21\u306e\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
SOCKET accept(SOCKET sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/strong>
\u63a5\u7d9a\u8981\u6c42\u3092\u53d7\u5bb9\u3057\u307e\u3059\u3002
\u63a5\u7d9a\u5f85\u3061\u30bd\u30b1\u30c3\u30c8 sockfd \u5b9b\u3066\u306e\u63a5\u7d9a\u8981\u6c42\u306b\u5bfe\u3057\u3066\u3001\u63a5\u7d9a\u6e08\u307f\u30bd\u30b1\u30c3\u30c8\u3092\u65b0\u898f\u306b\u751f\u6210\u3057\u307e\u3059\u3002
\u65b0\u898f\u306b\u751f\u6210\u3055\u308c\u305f\u30bd\u30b1\u30c3\u30c8\u306f\u3001\u9001\u53d7\u4fe1\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002
\u3082\u3068\u306e\u30bd\u30b1\u30c3\u30c8 sockfd \u306f\u3053\u306e\u547c\u3073\u51fa\u3057\u306b\u3088\u3063\u3066\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3002
\u3064\u307e\u308a\u3001\u518d\u3073\u63a5\u7d9a\u5f85\u3061\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
addr\u306b\u306f\u76f8\u624b\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831\u304c\u306f\u3044\u308a\u307e\u3059\u3002
\u76f8\u624b\u304cIPv4\u304bIPv6\u304b\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u5927\u304d\u306a\u69cb\u9020\u4f53sockaddr_storage\u3092\u6e21\u3057\u307e\u3059\u3002
accept\u306f\u30d6\u30ed\u30c3\u30af\u3059\u308b\u306e\u3067\u3001\u547c\u3073\u51fa\u3059\u524d\u306b\u63a5\u7d9a\u8981\u6c42\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092select\u3092
\u4f7f\u3063\u3066\u8abf\u3079\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u30a2\u30c9\u30ec\u30b9\u60c5\u5831\u3092\u8868\u3059\u69cb\u9020\u4f53\u304c\u3044\u304f\u3064\u304b\u51fa\u3066\u304d\u305f\u306e\u3067\u3001\u6574\u7406\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002
IPv4\/IPv6\u306e\u5171\u901a\u90e8\u5206\u306e\u69cb\u9020\u4f53\u3001\u30dd\u30a4\u30f3\u30bf\u306f\u3053\u308c\u3067\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u95a2\u6570\u306b\u6e21\u3057\u307e\u3059\u3002
sockaddr<\/strong>\u69cb\u9020\u4f53 (16\u30d0\u30a4\u30c8)
IPv4\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831
sockaddr_in<\/strong>\u69cb\u9020\u4f53 (16\u30d0\u30a4\u30c8)
in_addr<\/strong>\u69cb\u9020\u4f53 [iPv4\u306e\u30a2\u30c9\u30ec\u30b9\u502432bits]\u304c\u542b\u307e\u308c\u307e\u3059\u3002
IPv6\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831
sockaddr_in6<\/strong>\u69cb\u9020\u4f53 (28\u30d0\u30a4\u30c8)
in6_addr<\/strong>\u69cb\u9020\u4f53 [iPv6\u306e\u30a2\u30c9\u30ec\u30b9\u5024128bits]\u304c\u542b\u307e\u308c\u307e\u3059\u3002
IPv4\/IPv6\u306e\u3069\u3061\u3089\u3082\u683c\u7d0d\u3067\u304d\u308b\u5927\u304d\u306a\u69cb\u9020\u4f53
sockaddr_storage<\/strong>\u69cb\u9020\u4f53 (128\u30d0\u30a4\u30c8)<\/p>\n\n\n\n

DoRecv\u95a2\u6570\u3067\u306f\u3001\u6b21\u306e\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
int recv(SOCKET sockfd, void *buf, size_t len, int flags);<\/strong>
\u30c7\u30fc\u30bf\u53d7\u4fe1
\u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002
\u6210\u529f\u3057\u305f\u5834\u5408\u306b\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u9577\u3055\u304c\u8fd4\u3063\u3066\u304d\u307e\u3059\u3002
0\uff1a\u5207\u65ad -1\uff1a\u30a8\u30e9\u30fc
\u30bd\u30b1\u30c3\u30c8\u306b\u53d7\u3051\u53d6\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u5b58\u5728\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u5230\u7740\u3059\u308b\u307e\u3067
\u5f85\u3061\u307e\u3059\u3002\uff08\u30d6\u30ed\u30c3\u30af\u52d5\u4f5c\uff09
\u53d7\u4fe1\u3057\u305f\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u304c\u8981\u6c42\u3057\u305f\u30b5\u30a4\u30ba\u306b \u9054\u3059\u308b\u307e\u3067\u5f85\u3064\u306e\u3067\u306f\u306a\u304f\u3001
\u4f55\u3089\u304b\u306e\u30c7\u30fc\u30bf\u3092\u53d7\u4fe1\u3059\u308b\u3068\u5fa9\u5e30\u3057\u307e\u3059\u3002
recv\u306f\u30d6\u30ed\u30c3\u30af\u3059\u308b\u306e\u3067\u3001\u547c\u3073\u51fa\u3059\u524d\u306b\u63a5\u7d9a\u8981\u6c42\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092
select\u3092\u4f7f\u3063\u3066\u8abf\u3079\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

DestroySocket\u95a2\u6570\u3067\u306f\u3001\u6b21\u306e\u30bd\u30b1\u30c3\u30c8API\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
int shutdown(SOCKET sockfd, int how);<\/strong>
\u30bd\u30b1\u30c3\u30c8\u306e\u7834\u68c4
sockfd \u306b\u95a2\u9023\u3065\u3051\u3089\u308c\u3066\u3044\u308b\u30bd\u30b1\u30c3\u30c8\u306b\u3088\u308b\u5168\u4e8c\u91cd\u63a5\u7d9a (full-duplex
connection)\u306e\u4e00\u90e8\u307e\u305f\u306f\u5168\u3066\u3092\u9589\u3058\u307e\u3059\u3002
\u3053\u3053\u3067\u306f\u3001\u9001\u53d7\u4fe1\u3092\u9589\u3058\u308b\u305f\u3081\u6b21\u306e\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002
Windows\u3067\u306fhow\u306bSD_BOTH\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002
Linux\u3067\u306fhow\u306bSHUT_RDWR\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002
int closesocket(SOCKET sockfd);<\/strong> Windows\u7528
int close(SOCKET sockfd); <\/strong> Linux\u7528
\u30bd\u30b1\u30c3\u30c8\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u3092\u30af\u30ed\u30fc\u30ba\u3057\u307e\u3059 \u3002<\/p>\n\n\n\n

\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u52d5\u4f5c\u3092\u3059\u308b\u95a2\u6570\u306e\u76e3\u8996\u51e6\u7406\u306e\u305f\u3081\u306e\u95a2\u6570\u3068\u30de\u30af\u30ed\u306f\u6b21\u306e\u3082\u306e\u3067\u3059\u3002
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);<\/strong>
3 \u3064\u306e\u72ec\u7acb\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u96c6\u5408\u306e\u76e3\u8996\u3092\u884c\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
readfds \u306b\u5165\u308c\u3089\u308c\u305f\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u8aad\u307f\u8fbc\u307f\u304c\u53ef\u80fd\u304b\u3069\u3046\u304b
writefds \u306b\u5165\u308c\u3089\u308c\u305f\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u66f8\u304d\u8fbc\u307f\u7528\u306b\u5229\u7528\u53ef\u80fd\u306a\u9818\u57df\u304c\u3042\u308b\u304b
exceptfds \u306b\u3042\u308b\u3082\u306e\u306b\u3064\u3044\u3066\u306f\u3001\u4f8b\u5916\u306e\u76e3\u8996\u3092\u884c\u306a\u3044\u307e\u3059\u3002
\u30a4\u30d9\u30f3\u30c8\u3092\u76e3\u8996\u3057\u305f\u3044\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u304c\u4e00\u3064\u3082\u306a\u3044\u5834\u5408\u306b\u306f\u3001
\u5bfe\u5fdc\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u96c6\u5408\u306b NULL \u3092\u6307\u5b9a\u3057\u307e\u3059\u3002
nfds\u306b\u306f\u3001\u5bfe\u8c61\u3068\u3059\u308b\u30bd\u30b1\u30c3\u30c8\u306e\u6700\u5927\u5024+1\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002
\u305f\u3060\u3057\u3001Windows\u3067\u306f\u3053\u306e\u9805\u76ee\u306f\u7121\u8996\u3055\u308c\u308b\u306e\u3067FD_SETSIZE\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002
\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u3001\u69cb\u9020\u4f53fd_set\u306e\u8aac\u660e\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002
void FD_ZERO(fd_set *set);<\/strong>
\u96c6\u5408\u3092\u6d88\u53bb\u3057\u307e\u3059\u3002
void FD_SET(int fd, fd_set *set);<\/strong>
\u6307\u5b9a\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u306e\u96c6\u5408\u3078\u306e\u8ffd\u52a0
int FD_ISSET(int fd, fd_set *set);<\/strong>
\u96c6\u5408\u306b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u8abf\u3079\u307e\u3059\u3002<\/p>\n\n\n\n

\u69cb\u9020\u4f53fd_set\u306f\u3001Windows\u3068Linux\u3067\u69cb\u6210\u304c\u5168\u304f\u7570\u306a\u308a\u307e\u3059\u304c\u4f7f\u7528\u65b9\u6cd5\u306f\u540c\u3058\u3067\u3059\u3002
\u3069\u306e\u3088\u3046\u306a\u69cb\u9020\u4f53\u304b\u8abf\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u3010Linux\u306efd_set\u3011\ntypedef long int __fd_mask;\n#define __FD_SETSIZE 1024\n#define __NFDBITS (8 * (int)sizeof(__fd_mask));\n\ntypedef struct\n{\n __fd_mask fds_bits[__FD_SETSIZE \/ __NFDBITS];\n #define __FDS_BITS(set) ((set)->fds_bits)\n} fd_set;\n<\/p>\n\n\n\n

Linux\u306fLP64\u3064\u307e\u308along:64bits int:32bits\u306a\u306e\u3067\u3001__fd_mask\u306f64bits
__FD_SETSIZE \/ __NFDBITS = 1024 \/ 64 = 16
\u306a\u306e\u3067\u6b21\u306e\u5b9a\u7fa9\u3068\u540c\u7b49\u3068\u3044\u3046\u3053\u3068\u3067\u300110241bits\u306e\u9818\u57df\u3092\u3082\u3064\u914d\u5217\u3067\u3059\u3002
typedef struct {
long int fds_bits[16];
} fd_set;<\/p>\n\n\n\n

\u5404bit\u304c\u3001\u30bd\u30b1\u30c3\u30c8(\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf)\u306b\u5bfe\u5fdc\u3057\u307e\u3059\u3002
\uff08\u53c2\u8003\uff09 0:\u6a19\u6e96\u5165\u529b 1:\u6a19\u6e96\u51fa\u529b 2:\u6a19\u6e96\u30a8\u30e9\u30fc
\u30bd\u30b1\u30c3\u30c8\u3068\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306f\u540c\u3058\u306a\u306e\u3067\u3001select\u3092\u4f7f\u3063\u3066
\u30ad\u30fc\u30dc\u30fc\u30c9\u306e\u5165\u529b\u3092\u691c\u67fb\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u3064\u307e\u308a\u3001Linux\u3067\u306f\u3001select\u3092\u4f7f\u3063\u305f\u76e3\u8996\u306f\u6700\u5927\u3001\u30bd\u30b1\u30c3\u30c8\u756a\u53f71023\u307e\u3067\u3057\u304b\u5bfe\u5fdc\u3067\u304d\u307e\u305b\u3093\u3002
ulimit\u3092\u4f7f\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306e\u4e0a\u9650\u30921024\u3088\u308a\u5927\u304d\u304f\u3059\u308b\u3068\u3001FD_SET\u30671024\u4ee5\u4e0a\u306e
\u30bd\u30b1\u30c3\u30c8\u3092\u30bb\u30c3\u30c8\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30af\u30e9\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002<\/strong>
\u5bfe\u5fdc\u65b9\u6cd5\u306f\u3001select\u3092\u4f7f\u308f\u305a\u306bpoll\u3092\u4f7f\u3044\u307e\u3059\u3002
\u6642\u9593\u304c\u3042\u308c\u3070\u3001poll\u5bfe\u5fdc\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u3010Windows\u306efd_set\u3011\n#define FD_SETSIZE 64\n\ntypedef struct fd_set {\n u_int fd_count; \/* how many are SET? *\/\n SOCKET fd_array[FD_SETSIZE]; \/* an array of SOCKETs *\/\n} fd_set;<\/p>\n\n\n\n

SOCKET\u306flong long \u306a\u306e\u3067\u300164bits\u6574\u6570\u306e\u8981\u7d20\u6570\u304c64\u914d\u5217\u3067\u3059\u3002
Windows\u3067\u306f\u30bd\u30b1\u30c3\u30c8\u304c\u305d\u306e\u307e\u307e\u3053\u306e\u914d\u5217\u306b\u53ef\u80fd\u3055\u308c\u308b\u305f\u3081\u4e0a\u9650\u306flong long\u306e\u4e0a\u9650\u307e\u3067\u3067\u3059\u3002
\u3057\u305f\u304c\u3063\u3066select\u3067\u5927\u304d\u306a\u30bd\u30b1\u30c3\u30c8\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
Windows\u3067\u306f\u30bd\u30b1\u30c3\u30c8\u3068\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306f\u5225\u306e\u3082\u306e\u3068\u3044\u3046\u6271\u3044\u306a\u306e\u3067\u3001select\u3092\u4f7f\u3063\u3066
\u30ad\u30fc\u30dc\u30fc\u30c9\u306e\u5165\u529b\u3092\u691c\u67fb\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/strong><\/p>\n\n\n\n

\u7279\u6b8a\u306a\u30a2\u30c9\u30ec\u30b9(IPv4-mapped address<\/strong>)\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002
\u4f8b\u3048\u3070\u3001192.0.2.1\u306eIPv4-mapped address\u306f::ffff:192.0.2.1\u3067\u3059\u3002
\u3053\u308c\u306f\u3001IPv6\u306e\u30ce\u30fc\u30c9\u304cIPv6\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u30ce\u30fc\u30c9(IPv4\u3057\u304b\u30b5\u30dd\u30fc\u30c8
\u3057\u3066\u3044\u306a\u3044\uff09\u3068\u901a\u4fe1\u3059\u308b\u305f\u3081\u306eIPv6\u304c\u4f7f\u7528\u3067\u304d\u308b\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002
IPv4\u306e\u307f\u306e\u30ce\u30fc\u30c9\u304c192.0.2.1\u306b\u63a5\u7d9a(connect)\u8981\u6c42\u3059\u308b\u3068::ffff:192.0.2.1\u3067
\u5f85\u6a5f\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u306b\u63a5\u7d9a\u3067\u304d\u307e\u3059\u3002
\u3064\u307e\u308a\u3001192.0.2.1\u3068::ffff:192.0.2.1\u306f\u540c\u3058\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002
\u5f93\u3063\u3066\u4e21\u65b9\u306e\u30a2\u30c9\u30ec\u30b9\u306bbind\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002
\u4eca\u56de\u306e\u30b5\u30fc\u30d0\u306fIPv4\u3067\u3082IPv6\u3067\u3082\u52d5\u304f\u306e\u3067::ffff:192.0.2.1\u306f\u4f7f\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002
\u3010\u5bfe\u5fdc\u65b9\u6cd5\u3011
int setsockopt(SOCKET sockfd, int level, int optname, const void *optval, int optlen);<\/strong>
sockfd \u3067\u53c2\u7167\u3055\u308c\u308b\u30bd\u30b1\u30c3\u30c8\u306b\u95a2\u9023\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u8a2d\u5b9a\u3092\u884c\u3046
IPv6\u306e\u30bd\u30b1\u30c3\u30c8\u306b\u5bfe\u3057\u3066\u3001 IPv4-mapped address\u3092\u4f7f\u7528\u3057\u306a\u3044\u8a2d\u5b9a<\/p>\n\n\n\n

int on = 1;\nsetsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&on, sizeof(on));\n<\/p>\n\n\n\n

\u30af\u30ed\u30fc\u30ba\u76f4\u5f8c\u306b\u969bbind\u3067\u304d\u306a\u3044\u72b6\u614b\u304c\u8d77\u3053\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002
\u30b5\u30fc\u30d0\u3092\u7d42\u4e86\u3057\u305f\u76f4\u5f8c\u306b\u3082\u3046\u4e00\u5ea6\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001bind\u304c\u30a8\u30e9\u30fc\u3067
\u7d42\u4e86\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002
\u3057\u3070\u3089\u304f\u6642\u9593\u304c\u305f\u3063\u3066\u304b\u3089\u3082\u3046\u4e00\u5ea6\u5b9f\u884c\u3059\u308b\u3068\u554f\u984c\u306a\u304fbind\u304c\u6210\u529f\u3057\u307e\u3059\u3002
TCP\u30b5\u30fc\u30d0\u5074\u3067close\u3092\u5148\u306b\u5b9f\u884c\u3059\u308b\u3068\u767a\u751f
TCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u5148\u306bclose\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u767a\u751f\u3057\u306a\u3044
\u3010\u5bfe\u5fdc\u65b9\u6cd5\u3011
int setsockopt(SOCKET sockfd, int level, int optname, const void *optval, int optlen);<\/strong>
sockfd \u3067\u53c2\u7167\u3055\u308c\u308b\u30bd\u30b1\u30c3\u30c8\u306b\u95a2\u9023\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u8a2d\u5b9a\u3092\u884c\u3046<\/p>\n\n\n\n

int on = 1;\nsetsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));\n<\/p>\n\n\n\n

\u4ee5\u4e0a\u306e\u3053\u3068\u3092\u5ff5\u982d\u306b\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002
\u304b\u306a\u308a\u9577\u304f\u306a\u308a\u307e\u3057\u305f\u306e\u3067\u4f5c\u6210\u306f\u3001\u6b21\u56de\u3068\u3044\u3046\u3053\u3068\u3067\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

TCP\/IP\u3092\u4f7f\u3063\u3066\u901a\u4fe1\u3001\u6587\u5b57\u5217\u3092\u9001\u53d7\u4fe1\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308a\u307e\u3059\u3002\u6b21\u306e\u56f3\u306e\u3088\u3046\u306a\u4ed5\u7d44\u307f(Server-Client)\u3067\u52d5\u304d\u307e\u3059\u3002 \u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1\u3092\u884c\u3046\u90e8\u5206\u306f\u3001\u5225\u30b9\u30ec\u30c3\u30c9\u3067\u52d5\u304f\u3088\u3046\u306b\u3057\u307e\u3059\u304c\u5148\u305a\u306f\u5358\u7d14\u306a\u30b5\u30fc\u30d0\/\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 […]<\/p>\n","protected":false},"author":1,"featured_media":129,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_locale":"ja","_original_post":"https:\/\/www.oji-koji.com\/?p=657","footnotes":""},"categories":[6],"tags":[],"class_list":["post-657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-networkprograming","ja"],"_links":{"self":[{"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/posts\/657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=657"}],"version-history":[{"count":29,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/posts\/657\/revisions"}],"predecessor-version":[{"id":3099,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/posts\/657\/revisions\/3099"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=\/wp\/v2\/media\/129"}],"wp:attachment":[{"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oji-koji.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}