{"id":125928,"date":"2024-03-24T20:43:18","date_gmt":"2024-03-24T11:43:18","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-recvfrom-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/"},"modified":"2024-03-28T05:13:16","modified_gmt":"2024-03-27T20:13:16","slug":"linux-%e3%81%ae-recvfrom-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-recvfrom-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/","title":{"rendered":"Linux \u306e recvfrom \u95a2\u6570\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"

recvfrom\u95a2\u6570\u306f\u3001Linux\u30b7\u30b9\u30c6\u30e0\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u95a2\u6570\u306e\u4e00\u3064\u3067\u3059\u3002\u901a\u5e38\u3001\u3059\u3067\u306b\u78ba\u7acb\u6e08\u307f\u306e\u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

recvfrom\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

#include\u00a0<sys\/types.h><\/pre>\n
#include\u00a0<sys\/socket.h><\/p>\n
ssize_t\u00a0recvfrom(int\u00a0sockfd,\u00a0void\u00a0*buf,\u00a0size_t\u00a0len,\u00a0int\u00a0flags,<\/p>\n
struct\u00a0sockaddr\u00a0*src_addr,\u00a0socklen_t\u00a0*addrlen);<\/p>\n
<\/pre>\n
\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8aac\u660e:<\/p>\n
sockfd: \u30bd\u30b1\u30c3\u30c8\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30fc\u3001\u3064\u307e\u308a\u3053\u306e\u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
buf\uff1a\u53d7\u4fe1\u3057\u305f\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u53d7\u4fe1\u30d0\u30c3\u30d5\u30a1\u3078\u306e\u30dd\u30a4\u30f3\u30bf<\/p>\n
len: \u53d7\u3051\u53d6\u308a\u30d0\u30c3\u30d5\u30a1\u306e\u30b5\u30a4\u30ba\u3002\u53d7\u4fe1\u53ef\u80fd\u306a\u6700\u5927\u30d0\u30a4\u30c8\u6570\u3002<\/p>\n
\u30d5\u30e9\u30b0: \u53d7\u3051\u53d6\u308b\u64cd\u4f5c\u306e\u30d5\u30e9\u30b0(\u901a\u5e38\u306f0\u306b\u8a2d\u5b9a\u53ef\u80fd)<\/p>\n
src_addr\u306f\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u69cb\u9020\u4f53\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u53d7\u4fe1\u6642\u306b\u306f\u9001\u4fe1\u5143\u306e\u30a2\u30c9\u30ec\u30b9\u60c5\u5831\u3067\u57cb\u3081\u8fbc\u307e\u308c\u307e\u3059\u3002<\/p>\n
addrlen\u306f\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u69cb\u9020\u4f53\u306e\u9577\u3055\u3067\u3001\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u524d\u306b\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u69cb\u9020\u4f53\u306e\u5b9f\u969b\u306e\u9577\u3055\u306b\u521d\u671f\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u8fd4\u308a\u5024\uff1a<\/p>\n
1:\u30c7\u30fc\u30bf\u306e\u53d7\u4fe1\u306b\u5931\u6557\u3057\u307e\u3057\u305f\u3002<\/p>\n
0\uff1a\u5bf9\u65b9\u304c\u63a5\u7d9a\u3092\u9589\u3058\u305f\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
0 \u4ee5\u4e0a\uff1a\u5b9f\u969b\u306b\u53d7\u4fe1\u3055\u308c\u305f\u30d0\u30a4\u30c8\u6570<\/p>\n
recvfrom \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066 UDP \u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u4fe1\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n
#include\u00a0<stdio.h><\/pre>\n
#include\u00a0<stdlib.h><\/p>\n
#include\u00a0<sys\/types.h><\/p>\n
#include\u00a0<sys\/socket.h><\/p>\n
#include\u00a0<netinet\/in.h><\/p>\n
#define\u00a0BUF_SIZE\u00a01024<\/p>\n
int\u00a0main()\u00a0{<\/p>\n
int\u00a0sockfd;<\/p>\n
struct\u00a0sockaddr_in\u00a0server_addr,\u00a0client_addr;<\/p>\n
socklen_t\u00a0addr_len\u00a0=\u00a0sizeof(client_addr);<\/p>\n
char\u00a0buffer[BUF_SIZE];<\/p>\n
\/\/\u00a0\u521b\u5efa\u5957\u63a5\u5b57<\/p>\n
sockfd\u00a0=\u00a0socket(AF_INET,\u00a0SOCK_DGRAM,\u00a00);<\/p>\n
if\u00a0(sockfd\u00a0<\u00a00)\u00a0{<\/p>\n
perror(“socket\u00a0creation\u00a0failed”);<\/p>\n
exit(EXIT_FAILURE);<\/p>\n
}<\/p>\n
\/\/\u00a0\u7ed1\u5b9a\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3<\/p>\n
server_addr.sin_family\u00a0=\u00a0AF_INET;<\/p>\n
server_addr.sin_port\u00a0=\u00a0htons(8080);<\/p>\n
server_addr.sin_addr.s_addr\u00a0=\u00a0INADDR_ANY;<\/p>\n
if\u00a0(bind(sockfd,\u00a0(const\u00a0struct\u00a0sockaddr\u00a0*)&server_addr,\u00a0sizeof(server_addr))\u00a0<\u00a00)\u00a0{<\/p>\n
perror(“bind\u00a0failed”);<\/p>\n
exit(EXIT_FAILURE);<\/p>\n
}<\/p>\n
\/\/\u00a0\u63a5\u6536\u6570\u636e<\/p>\n
ssize_t\u00a0recv_bytes\u00a0=\u00a0recvfrom(sockfd,\u00a0buffer,\u00a0BUF_SIZE,\u00a00,\u00a0(struct\u00a0sockaddr\u00a0*)&client_addr,\u00a0&addr_len);<\/p>\n
if\u00a0(recv_bytes\u00a0<\u00a00)\u00a0{<\/p>\n
perror(“recvfrom\u00a0failed”);<\/p>\n
exit(EXIT_FAILURE);<\/p>\n
}<\/p>\n
buffer[recv_bytes]\u00a0=\u00a0‘\\0’;<\/p>\n
printf(“Received\u00a0message:\u00a0%s\\n”,\u00a0buffer);<\/p>\n
close(sockfd);<\/p>\n
return\u00a00;<\/p>\n
}<\/p>\n
<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001UDP\u30bd\u30b1\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u3001\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9\u3068\u30dd\u30fc\u30c8\u756a\u53f78080\u306b\u30d0\u30a4\u30f3\u30c9\u3057\u307e\u3059\u3002\u6b21\u306b\u3001recvfrom\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30c7\u30fc\u30bf\u3092\u53d7\u4fe1\u3057\u3001\u53d7\u4fe1\u3057\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n
\u73fe\u5b9f\u306e\u958b\u767a\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b89\u5b9a\u6027\u3068\u6b63\u78ba\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001\u9519\u8bef\u51e6\u7406\u3001\u8907\u6570\u56de\u306e\u53d7\u4fe1\u51e6\u7406\u306a\u3069\u3001\u5177\u4f53\u7684\u306a\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u5bfe\u51e6\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
recvfrom\u95a2\u6570\u306f\u3001Linux\u30b7\u30b9\u30c6\u30e0\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u95a2\u6570\u306e\u4e00\u3064\u3067\u3059\u3002\u901a\u5e38\u3001\u3059\u3067\u306b\u78ba\u7acb\u6e08\u307f\u306e\u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 recvfrom\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-125928","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nLinux \u306e recvfrom \u95a2\u6570\u306e\u4f7f\u3044\u65b9 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/linux-\u306e-recvfrom-\u95a2\u6570\u306e\u4f7f\u3044\u65b9\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux \u306e recvfrom \u95a2\u6570\u306e\u4f7f\u3044\u65b9\" \/>\n<meta property=\"og:description\" content=\"recvfrom\u95a2\u6570\u306f\u3001Linux\u30b7\u30b9\u30c6\u30e0\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u95a2\u6570\u306e\u4e00\u3064\u3067\u3059\u3002\u901a\u5e38\u3001\u3059\u3067\u306b\u78ba\u7acb\u6e08\u307f\u306e\u30bd\u30b1\u30c3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 recvfrom\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/linux-\u306e-recvfrom-\u95a2\u6570\u306e\u4f7f\u3044\u65b9\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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