{"id":379,"date":"2026-05-05T23:30:45","date_gmt":"2026-05-05T15:30:45","guid":{"rendered":"http:\/\/www.millscience.cn\/?p=379"},"modified":"2026-05-05T23:30:48","modified_gmt":"2026-05-05T15:30:48","slug":"udpbroadcast-2","status":"publish","type":"post","link":"https:\/\/www.millscience.cn\/index.php\/udpbroadcast-2\/","title":{"rendered":"UDP\u591a\u64ad\u4ee3\u7801\u5b9e\u73b0"},"content":{"rendered":"\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"\u590d\u5236\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>\/**\n * @filename:    udp_Broadcast_Send.c\n * @brief:       udp Broadcast\n * @author:      philia\n * @date:        2026\/4\/21\n * @version:     ver1.0\n * @note         \u6b64\u7aef\u53d1\u9001\u6d88\u606f\n * CopyRight (c) 2026   philia  All Right Reseverd\n *\/\n#include &lt;stdio.h>\n#include &lt;sys\/types.h> \/* See NOTES *\/\n#include &lt;sys\/socket.h>\n#include &lt;netinet\/ip.h> \/* superset of previous *\/\n#include &lt;arpa\/inet.h>\n#include &lt;errno.h>\n#include &lt;string.h>\n#include &lt;stdlib.h>\n\n#define GROUP_IP \"224.1.1.1\"   \/\/\u591a\u64adIP\n\/\/\u591a\u64ad\u53d1\u9001\u65b9\uff1a\u53ea\u9700\u77e5\u9053\u591a\u64ad\u7ec4\u5730\u5740\u548c\u7aef\u53e3\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u63a5\u6536\u65b9\u7684 IP\n\nint main(int argc, const char *argv[])\n{\n    \/\/\u521b\u5efaudp\u5957\u63a5\u5b57\n    int udp_socket = socket(AF_INET, SOCK_DGRAM, 0);\n    if (udp_socket == -1)\n    {\n        fprintf(stderr, \"udp_socket error, errno:%d,%s\", errno, strerror(errno));\n        exit(-1);\n    }\n\n    struct sockaddr_in dest_addr;\n\n    \/\/ destaddr\u7ed3\u6784\u4f53\u8d4b\u503c\n    dest_addr.sin_family = AF_INET;\n    dest_addr.sin_port = htons(60001);\n    inet_pton(AF_INET, GROUP_IP, &amp;dest_addr.sin_addr.s_addr);\n\n    \/\/ \u53d1\u9001\u6d88\u606f\n    char buf&#91;128&#93; = {0};\n    while (1)\n    {\n        scanf(\" %&#91;^\\n&#93;\", buf);\n        sendto(udp_socket, buf, strlen(buf), 0, (struct sockaddr *)&amp;dest_addr, sizeof(dest_addr));\n        printf(\"\u53d1\u9001\u7684\u7ec4\u64ad\u7684\u6570\u636e: %s\\n\", buf);\n        bzero(buf, sizeof(buf));\n    }\n\n    return 0;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/**<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@filename:<\/span><span style=\"color: #6A9955\">    udp_Broadcast_Send.c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@brief<\/span><span style=\"color: #6A9955\">:       udp Broadcast<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@author<\/span><span style=\"color: #6A9955\">:      philia<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@date<\/span><span style=\"color: #6A9955\">:        2026\/4\/21<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@version<\/span><span style=\"color: #6A9955\">:     ver1.0<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@note<\/span><span style=\"color: #6A9955\">         \u6b64\u7aef\u53d1\u9001\u6d88\u606f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * CopyRight (c) 2026   philia  All Right Reseverd<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdio.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/types.h&gt;<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #6A9955\">\/* See NOTES *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/socket.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;netinet\/ip.h&gt;<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #6A9955\">\/* superset of previous *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;arpa\/inet.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;errno.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;string.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdlib.h&gt;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#define<\/span><span style=\"color: #569CD6\"> GROUP_IP <\/span><span style=\"color: #CE9178\">&quot;224.1.1.1&quot;<\/span><span style=\"color: #6A9955\">   \/\/\u591a\u64adIP<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/\u591a\u64ad\u53d1\u9001\u65b9\uff1a\u53ea\u9700\u77e5\u9053\u591a\u64ad\u7ec4\u5730\u5740\u548c\u7aef\u53e3\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u63a5\u6536\u65b9\u7684 IP<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">main<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">argc<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #569CD6\">[]<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u521b\u5efaudp\u5957\u63a5\u5b57<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> udp_socket = <\/span><span style=\"color: #DCDCAA\">socket<\/span><span style=\"color: #D4D4D4\">(AF_INET, SOCK_DGRAM, <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (udp_socket == -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fprintf<\/span><span style=\"color: #D4D4D4\">(stderr, <\/span><span style=\"color: #CE9178\">&quot;udp_socket error, errno:<\/span><span style=\"color: #9CDCFE\">%d<\/span><span style=\"color: #CE9178\">,<\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, errno, <\/span><span style=\"color: #DCDCAA\">strerror<\/span><span style=\"color: #D4D4D4\">(errno));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">exit<\/span><span style=\"color: #D4D4D4\">(-<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> sockaddr_in dest_addr;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ destaddr\u7ed3\u6784\u4f53\u8d4b\u503c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">dest_addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_family<\/span><span style=\"color: #D4D4D4\"> = AF_INET;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">dest_addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_port<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">htons<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #B5CEA8\">60001<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">inet_pton<\/span><span style=\"color: #D4D4D4\">(AF_INET, GROUP_IP, &amp;<\/span><span style=\"color: #9CDCFE\">dest_addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">s_addr<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u53d1\u9001\u6d88\u606f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">buf<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">128<\/span><span style=\"color: #D4D4D4\">&#93; = {<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">while<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">scanf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot; <\/span><span style=\"color: #F44747\">%<\/span><span style=\"color: #CE9178\">&#91;^<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&#93;&quot;<\/span><span style=\"color: #D4D4D4\">, buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">sendto<\/span><span style=\"color: #D4D4D4\">(udp_socket, buf, <\/span><span style=\"color: #DCDCAA\">strlen<\/span><span style=\"color: #D4D4D4\">(buf), <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">, (<\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> sockaddr *)&amp;dest_addr, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(dest_addr));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u53d1\u9001\u7684\u7ec4\u64ad\u7684\u6570\u636e: <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">bzero<\/span><span style=\"color: #D4D4D4\">(buf, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(buf));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"\u590d\u5236\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>\/**\n * @filename:    udp_Broadcast_Recv.c\n * @brief:       udp Broadcast\n * @author:      philia\n * @date:        2026\/4\/21\n * @version:     ver1.0\n * @note         \u6b64\u7aef\u63a5\u6536\u6d88\u606f\n * CopyRight (c) 2026   philia  All Right Reseverd\n *\/\n#include &lt;stdio.h>\n#include &lt;sys\/types.h> \/* See NOTES *\/\n#include &lt;sys\/socket.h>\n#include &lt;netinet\/ip.h> \/* superset of previous *\/\n#include &lt;arpa\/inet.h>\n#include &lt;errno.h>\n#include &lt;string.h>\n#include &lt;stdlib.h>\n#include &lt;net\/if.h>\n\n#define GROUP_IP \"224.1.1.1\"   \/\/\u591a\u64adIP\n\/\/\u591a\u64ad\u63a5\u6536\u65b9\uff1a\u9700\u8981\u4e3b\u52a8\u52a0\u5165\u591a\u64ad\u7ec4\uff0c\u4e0d\u9700\u8981\u544a\u77e5\u53d1\u9001\u65b9\u81ea\u5df1\u7684 IP\n\nint main(int argc, const char *argv[])\n{\n\n    \/\/ \u521b\u5efa\u5957\u63a5\u5b57\u6587\u4ef6\n    int udp_socket = socket(AF_INET, SOCK_DGRAM, 0);\n    if (udp_socket == -1)\n    {\n        fprintf(stderr, \"udp_socket error, errno:%d,%s\", errno, strerror(errno));\n        exit(-1);\n    }\n\n    \/\/\u901a\u4fe1\u7684\u5957\u63a5\u5b57\u548c\u672c\u5730\u7684IP\u4e0e\u7aef\u53e3\u7ed1\u5b9a\n    struct sockaddr_in addr;\n    addr.sin_family = AF_INET;\n    addr.sin_port = htons(60001);           \n    addr.sin_addr.s_addr = htonl(INADDR_ANY); \n    int ret = bind(udp_socket, (struct sockaddr *)&amp;addr, sizeof(addr));\n    if (ret == -1)\n    {\n        perror(\"bind\");\n        exit(0);\n    }\n\n    struct ip_mreqn\n    {\n        struct in_addr imr_multiaddr; \/* IP multicast group\n                                         address *\/\n        struct in_addr imr_address;   \/* IP address of local\n                                         interface *\/\n        int imr_ifindex;              \/* interface index *\/\n    };\n\n    \/\/\u52a0\u5165\u591a\u64ad\u7ec4\n    struct ip_mreqn mreqn;\n    mreqn.imr_multiaddr.s_addr = inet_addr(GROUP_IP);\n    mreqn.imr_address.s_addr = INADDR_ANY;\n    mreqn.imr_ifindex = if_nametoindex(\"ens33\");\n    socklen_t size = sizeof(mreqn);\n\n    int isset = setsockopt(udp_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &amp;mreqn, size);\n    if (isset == -1)\n    {\n        fprintf(stderr, \"setsockopt error, errno:%d,%s\", errno, strerror(errno));\n        exit(-1);\n    }\n\n    \/\/ \u53d1\u9001\u6d88\u606f\n    char buf&#91;128&#93; = {0};\n    while (1)\n    {\n        recvfrom(udp_socket, &amp;buf, sizeof(buf), 0, NULL, NULL);\n        printf(\"recv data is &#91;%s&#93;\\n\", buf);\n        bzero(buf, sizeof(buf));\n    }\n\n    return 0;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A9955\">\/**<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@filename:<\/span><span style=\"color: #6A9955\">    udp_Broadcast_Recv.c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@brief<\/span><span style=\"color: #6A9955\">:       udp Broadcast<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@author<\/span><span style=\"color: #6A9955\">:      philia<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@date<\/span><span style=\"color: #6A9955\">:        2026\/4\/21<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@version<\/span><span style=\"color: #6A9955\">:     ver1.0<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@note<\/span><span style=\"color: #6A9955\">         \u6b64\u7aef\u63a5\u6536\u6d88\u606f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * CopyRight (c) 2026   philia  All Right Reseverd<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdio.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/types.h&gt;<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #6A9955\">\/* See NOTES *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/socket.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;netinet\/ip.h&gt;<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #6A9955\">\/* superset of previous *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;arpa\/inet.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;errno.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;string.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdlib.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;net\/if.h&gt;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#define<\/span><span style=\"color: #569CD6\"> GROUP_IP <\/span><span style=\"color: #CE9178\">&quot;224.1.1.1&quot;<\/span><span style=\"color: #6A9955\">   \/\/\u591a\u64adIP<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/\u591a\u64ad\u63a5\u6536\u65b9\uff1a\u9700\u8981\u4e3b\u52a8\u52a0\u5165\u591a\u64ad\u7ec4\uff0c\u4e0d\u9700\u8981\u544a\u77e5\u53d1\u9001\u65b9\u81ea\u5df1\u7684 IP<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">main<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">argc<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #569CD6\">[]<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u521b\u5efa\u5957\u63a5\u5b57\u6587\u4ef6<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> udp_socket = <\/span><span style=\"color: #DCDCAA\">socket<\/span><span style=\"color: #D4D4D4\">(AF_INET, SOCK_DGRAM, <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (udp_socket == -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fprintf<\/span><span style=\"color: #D4D4D4\">(stderr, <\/span><span style=\"color: #CE9178\">&quot;udp_socket error, errno:<\/span><span style=\"color: #9CDCFE\">%d<\/span><span style=\"color: #CE9178\">,<\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, errno, <\/span><span style=\"color: #DCDCAA\">strerror<\/span><span style=\"color: #D4D4D4\">(errno));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">exit<\/span><span style=\"color: #D4D4D4\">(-<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u901a\u4fe1\u7684\u5957\u63a5\u5b57\u548c\u672c\u5730\u7684IP\u4e0e\u7aef\u53e3\u7ed1\u5b9a<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> sockaddr_in addr;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_family<\/span><span style=\"color: #D4D4D4\"> = AF_INET;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_port<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">htons<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #B5CEA8\">60001<\/span><span style=\"color: #D4D4D4\">);           <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">sin_addr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">s_addr<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">htonl<\/span><span style=\"color: #D4D4D4\">(INADDR_ANY); <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> ret = <\/span><span style=\"color: #DCDCAA\">bind<\/span><span style=\"color: #D4D4D4\">(udp_socket, (<\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> sockaddr *)&amp;addr, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(addr));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (ret == -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;bind&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">exit<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> ip_mreqn<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> in_addr imr_multiaddr;<\/span><span style=\"color: #6A9955\"> \/* IP multicast group<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">                                         address *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> in_addr imr_address;<\/span><span style=\"color: #6A9955\">   \/* IP address of local<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">                                         interface *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> imr_ifindex;<\/span><span style=\"color: #6A9955\">              \/* interface index *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    };<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u52a0\u5165\u591a\u64ad\u7ec4<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> ip_mreqn mreqn;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">mreqn<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">imr_multiaddr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">s_addr<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">inet_addr<\/span><span style=\"color: #D4D4D4\">(GROUP_IP);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">mreqn<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">imr_address<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">s_addr<\/span><span style=\"color: #D4D4D4\"> = INADDR_ANY;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">mreqn<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">imr_ifindex<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">if_nametoindex<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;ens33&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">socklen_t<\/span><span style=\"color: #D4D4D4\"> size = <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(mreqn);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> isset = <\/span><span style=\"color: #DCDCAA\">setsockopt<\/span><span style=\"color: #D4D4D4\">(udp_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &amp;mreqn, size);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (isset == -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fprintf<\/span><span style=\"color: #D4D4D4\">(stderr, <\/span><span style=\"color: #CE9178\">&quot;setsockopt error, errno:<\/span><span style=\"color: #9CDCFE\">%d<\/span><span style=\"color: #CE9178\">,<\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, errno, <\/span><span style=\"color: #DCDCAA\">strerror<\/span><span style=\"color: #D4D4D4\">(errno));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">exit<\/span><span style=\"color: #D4D4D4\">(-<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u53d1\u9001\u6d88\u606f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">buf<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">128<\/span><span style=\"color: #D4D4D4\">&#93; = {<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">while<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">recvfrom<\/span><span style=\"color: #D4D4D4\">(udp_socket, &amp;buf, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(buf), <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">NULL<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">NULL<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;recv data is &#91;<\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\">&#93;<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">bzero<\/span><span style=\"color: #D4D4D4\">(buf, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(buf));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":380,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,13],"tags":[],"class_list":["post-379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-embedded","category-learning"],"_links":{"self":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/comments?post=379"}],"version-history":[{"count":1,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/379\/revisions"}],"predecessor-version":[{"id":381,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/379\/revisions\/381"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media\/380"}],"wp:attachment":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media?parent=379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/categories?post=379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/tags?post=379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}