{"id":68673,"date":"2025-05-18T10:58:16","date_gmt":"2025-05-18T02:58:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=68673"},"modified":"2025-05-18T10:58:16","modified_gmt":"2025-05-18T02:58:16","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3c%e8%af%ad%e8%a8%80%e4%b8%ad%e7%9a%84%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e4%b8%8e%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c%ef%bc%9a%e6%9e%84%e5%bb%ba%e9%ab%98%e6%95%88","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/68673\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3C\u8bed\u8a00\u4e2d\u7684\u7cfb\u7edf\u8c03\u7528\u4e0e\u6587\u4ef6\u64cd\u4f5c\uff1a\u6784\u5efa\u9ad8\u6548\u670d\u52a1\u5668\u5e94\u7528\u7684\u5173\u952e"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h2>\u5f15\u8a00<\/h2>\n<p>\u5728\u6784\u5efa\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u5e94\u7528\u65f6\uff0c\u5e95\u5c42\u7cfb\u7edf\u8c03\u7528\u7684\u8fd0\u7528\u662f\u7ed5\u4e0d\u5f00\u7684\u8bdd\u9898\u3002\u7279\u522b\u662f\u4f7f\u7528C\u8bed\u8a00\u8fdb\u884c\u5f00\u53d1\u7684\u6280\u672f\u4eba\u5458\uff0c\u4e86\u89e3\u7cfb\u7edf\u8c03\u7528\u4e0e\u6807\u51c6\u5e93\u51fd\u6570\u7684\u533a\u522b\uff0c\u4e0d\u4ec5\u6709\u52a9\u4e8e\u4f18\u5316\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u8fd8\u80fd\u66f4\u597d\u5730\u5e94\u5bf9\u9ad8\u5e76\u53d1\u73af\u5883\u4e2d\u5bf9\u8d44\u6e90\u7ba1\u7406\u7684\u7cbe\u7ec6\u5316\u9700\u6c42\u3002\u5728\u90e8\u7f72<strong>\u7f8e\u56fd\u4e91\u670d\u52a1\u5668<\/strong>\u7b49\u57fa\u7840\u67b6\u6784\u65f6\uff0c\u8fd9\u4e9b\u5e95\u5c42\u77e5\u8bc6\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<h2>\u7cfb\u7edf\u8c03\u7528\uff1a\u8fde\u63a5\u7528\u6237\u7a0b\u5e8f\u4e0e\u5185\u6838\u7684\u6865\u6881<\/h2>\n<p>\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u7cfb\u7edf\u8c03\u7528\uff08System Call\uff09\u662f\u7528\u6237\u6001\u7a0b\u5e8f\u8bbf\u95ee\u5185\u6838\u529f\u80fd\u7684\u91cd\u8981\u63a5\u53e3\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u89c6\u4e3a\u5e94\u7528\u7a0b\u5e8f\u4e0e\u64cd\u4f5c\u7cfb\u7edf\u4e4b\u95f4\u7684\u4e00\u6247\u95e8\u3002<\/p>\n<p>\u5e38\u89c1\u7684\u7cfb\u7edf\u8c03\u7528\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u6587\u4ef6\u64cd\u4f5c\u7c7b<\/strong>\uff1a<code>open()<\/code>\u3001<code>read()<\/code>\u3001<code>write()<\/code>\u3001<code>close()<\/code>\u3001<code>lseek()<\/code><\/li>\n<li><strong>\u8fdb\u7a0b\u63a7\u5236\u7c7b<\/strong>\uff1a<code>fork()<\/code>\u3001<code>exec()<\/code>\u3001<code>wait()<\/code>\u3001<code>exit()<\/code><\/li>\n<li><strong>\u4fe1\u53f7\u5904\u7406\u7c7b<\/strong>\uff1a<code>signal()<\/code>\u3001<code>kill()<\/code><\/li>\n<li><strong>\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7c7b<\/strong>\uff1a<code>pipe()<\/code>\u3001<code>shmget()<\/code>\u3001<code>msgget()<\/code><\/li>\n<li><strong>\u7f51\u7edc\u901a\u4fe1\u7c7b<\/strong>\uff1a<code>socket()<\/code>\u3001<code>bind()<\/code>\u3001<code>listen()<\/code>\u3001<code>accept()<\/code><\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u8c03\u7528\u591a\u6570\u76f4\u63a5\u901a\u8fc7\u6c47\u7f16\u6307\u4ee4\uff08\u5982 <code>syscall<\/code>\uff09\u89e6\u53d1\u5185\u6838\u6001\u6267\u884c\uff0c\u8fd4\u56de\u7ed3\u679c\u540e\u518d\u5207\u6362\u56de\u7528\u6237\u6001\u3002\u7531\u4e8e\u6d89\u53ca\u4e0a\u4e0b\u6587\u5207\u6362\uff0c\u7cfb\u7edf\u8c03\u7528\u7684\u5f00\u9500\u76f8\u5bf9\u8f83\u9ad8\uff0c\u4f46\u5b83\u63d0\u4f9b\u4e86\u5bf9\u5e95\u5c42\u8d44\u6e90\u7684\u76f4\u63a5\u63a7\u5236\uff0c\u662f\u6784\u5efa\u7a33\u5b9a\u9ad8\u6027\u80fd<strong>\u7f8e\u56fd\u670d\u52a1\u5668<\/strong>\u5e94\u7528\u7684\u91cd\u8981\u57fa\u7840\u3002<\/p>\n<h2>\u7cfb\u7edf\u8c03\u7528\u4e0e\u6807\u51c6\u5e93\u51fd\u6570\u7684\u5173\u7cfb<\/h2>\n<p>\u6807\u51c6\u5e93\u51fd\u6570\u5982 <code>fread()<\/code>\u3001<code>fwrite()<\/code> \u5b9e\u9645\u662f\u5bf9\u7cfb\u7edf\u8c03\u7528\u7684\u5c01\u88c5\uff0c\u5b83\u4eec\u901a\u8fc7\u589e\u52a0\u7f13\u51b2\u673a\u5236\u63d0\u5347\u6027\u80fd\uff0c\u4f46\u5728\u6781\u7aef\u573a\u666f\uff08\u5982\u9ad8\u5e76\u53d1\u65e5\u5fd7\u5199\u5165\uff09\u4e2d\u53ef\u80fd\u4e0d\u5982\u7cfb\u7edf\u8c03\u7528\u7075\u6d3b\u3002\u5bf9\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u7406\u89e3\u5176\u80cc\u540e\u7684\u5de5\u4f5c\u539f\u7406\u6709\u52a9\u4e8e\u5728<strong>\u7f8e\u56fdVPS<\/strong>\u4e0a\u4f18\u5316\u8d44\u6e90\u8c03\u5ea6\u4e0eI\/O\u5904\u7406\u903b\u8f91\u3002<\/p>\n<p>\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff0c\u6f14\u793a\u4e86\u57fa\u672c\u7684\u6587\u4ef6\u5199\u64cd\u4f5c\uff1a<\/p>\n<pre><code class=\"language-c\">#include &lt;fcntl.h&gt;\r\n#include &lt;unistd.h&gt;\r\n#include &lt;stdio.h&gt;\r\n\r\nint main() {\r\n    int fd = open(\"demo.txt\", O_CREAT | O_WRONLY, 0644);\r\n    if (fd == -1) {\r\n        perror(\"open failed\");\r\n        return 1;\r\n    }\r\n    write(fd, \"Hello from server\\n\", 18);\r\n    close(fd);\r\n    return 0;\r\n}\r\n<\/code><\/pre>\n<p>\u6b64\u7c7b\u4ee3\u7801\u5728\u90e8\u7f72\u4e8e<strong>\u7f8e\u56fd\u4e91\u670d\u52a1\u5668<\/strong>\u4e0a\u65f6\uff0c\u80fd\u591f\u6700\u5927\u5316\u5730\u53d1\u6325\u7cfb\u7edf\u8d44\u6e90\u6548\u7387\uff0c\u7279\u522b\u9002\u7528\u4e8e\u9700\u8981\u4f4e\u5ef6\u8fdf\u548c\u9ad8\u541e\u5410\u7684\u573a\u666f\u3002<\/p>\n<h2>\u6587\u4ef6\u7cfb\u7edf\u4e0e I\/O \u6a21\u578b\u89e3\u6790<\/h2>\n<p>\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u6587\u4ef6\u7cfb\u7edf\u7531\u591a\u4e2a\u6838\u5fc3\u7ec4\u4ef6\u6784\u6210\uff1a<\/p>\n<ul>\n<li><strong>inode \u8282\u70b9<\/strong>\uff1a\u4fdd\u5b58\u6587\u4ef6\u5143\u6570\u636e\uff08\u6743\u9650\u3001\u65f6\u95f4\u6233\u7b49\uff09<\/li>\n<li><strong>\u76ee\u5f55\u7ed3\u6784<\/strong>\uff1a\u7528\u4e8e\u5c06\u6587\u4ef6\u540d\u6620\u5c04\u5230 inode<\/li>\n<li><strong>\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868<\/strong>\uff1a\u6bcf\u4e2a\u8fdb\u7a0b\u72ec\u6709\uff0c\u7528\u4e8e\u7ba1\u7406\u6253\u5f00\u7684\u6587\u4ef6\u8d44\u6e90<\/li>\n<\/ul>\n<p>C\u8bed\u8a00\u4e2d\u63d0\u4f9b\u4e24\u5957\u64cd\u4f5c\u63a5\u53e3\uff1a<\/p>\n<ul>\n<li><strong>\u6807\u51c6 I\/O<\/strong>\uff1a\u5982 <code>fopen()<\/code>\u3001<code>fread()<\/code>\uff0c\u9002\u5408\u901a\u7528\u573a\u666f<\/li>\n<li><strong>\u7cfb\u7edf\u8c03\u7528\u7ea7\u63a5\u53e3<\/strong>\uff1a\u5982 <code>open()<\/code>\u3001<code>read()<\/code>\uff0c\u9002\u7528\u4e8e\u5bf9\u6027\u80fd\u548c\u63a7\u5236\u8981\u6c42\u8f83\u9ad8\u7684\u670d\u52a1\u7aef\u7a0b\u5e8f<\/li>\n<\/ul>\n<p>\u6b64\u5916\uff0c\u670d\u52a1\u5668\u5e94\u7528\u8fd8\u9700\u719f\u6089\u51e0\u79cd I\/O \u6a21\u578b\uff1a<\/p>\n<ul>\n<li>\u963b\u585e I\/O\uff1a\u7ebf\u7a0b\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210<\/li>\n<li>\u975e\u963b\u585e I\/O\uff1a\u7acb\u5373\u8fd4\u56de\uff0c\u9700\u8f6e\u8be2\u72b6\u6001<\/li>\n<li>I\/O \u591a\u8def\u590d\u7528\uff1a\u901a\u8fc7 <code>select()<\/code>\u3001<code>poll()<\/code>\u3001<code>epoll()<\/code> \u540c\u65f6\u76d1\u542c\u591a\u4e2a\u63cf\u8ff0\u7b26<\/li>\n<li>\u5f02\u6b65 I\/O\uff08AIO\uff09\uff1a\u64cd\u4f5c\u5b8c\u6210\u540e\u901a\u8fc7\u4e8b\u4ef6\u901a\u77e5<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86 <code>select()<\/code> \u7684\u4f7f\u7528\uff0c\u53ef\u7528\u4e8e\u6784\u5efa\u57fa\u7840\u7684 I\/O \u591a\u8def\u590d\u7528\u670d\u52a1\uff1a<\/p>\n<pre><code class=\"language-c\">#include &lt;sys\/select.h&gt;\r\n#include &lt;unistd.h&gt;\r\n#include &lt;stdio.h&gt;\r\n\r\nint main() {\r\n    fd_set set;\r\n    FD_ZERO(&amp;set);\r\n    FD_SET(STDIN_FILENO, &amp;set);\r\n    struct timeval tv = {5, 0};\r\n\r\n    if (select(STDIN_FILENO + 1, &amp;set, NULL, NULL, &amp;tv)) {\r\n        char buf[100];\r\n        read(STDIN_FILENO, buf, sizeof(buf));\r\n        printf(\"Input: %s\\n\", buf);\r\n    } else {\r\n        printf(\"Timeout waiting for input.\\n\");\r\n    }\r\n    return 0;\r\n}\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u4f7f\u7528<strong>\u7f8e\u56fdVPS<\/strong>\u642d\u5efa\u7684\u591a\u7ebf\u7a0b\u6216\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668\uff0c\u8fd9\u7c7b\u673a\u5236\u662f\u5b9e\u73b0\u9ad8\u5e76\u53d1\u7684\u57fa\u7840\u3002<\/p>\n<h2>\u4fe1\u53f7\u673a\u5236\uff1a\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406\u7684\u5229\u5668<\/h2>\n<p>\u4fe1\u53f7\u662f\u8fdb\u7a0b\u95f4\u7684\u4e00\u79cd\u8f7b\u91cf\u7ea7\u901a\u4fe1\u65b9\u5f0f\uff0c\u5e38\u7528\u4e8e\u54cd\u5e94\u5916\u90e8\u4e8b\u4ef6\u3002\u4f8b\u5982\uff0c\u6309\u4e0b <code>Ctrl+C<\/code> \u4f1a\u5411\u524d\u53f0\u8fdb\u7a0b\u53d1\u9001 <code>SIGINT<\/code> \u4fe1\u53f7\u3002<\/p>\n<p>\u5f00\u53d1\u8005\u53ef\u4f7f\u7528 <code>signal()<\/code> \u6ce8\u518c\u5904\u7406\u51fd\u6570\uff0c\u5b9e\u73b0\u81ea\u5b9a\u4e49\u884c\u4e3a\u3002\u4ee5\u4e0b\u4e3a\u5178\u578b\u7684\u4fe1\u53f7\u5904\u7406\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-c\">#include &lt;signal.h&gt;\r\n#include &lt;stdio.h&gt;\r\n#include &lt;unistd.h&gt;\r\n\r\nvolatile sig_atomic_t stop = 0;\r\n\r\nvoid handle_sigint(int sig) {\r\n    stop = 1;\r\n}\r\n\r\nint main() {\r\n    signal(SIGINT, handle_sigint);\r\n    while (!stop) {\r\n        printf(\"Running...\\n\");\r\n        sleep(1);\r\n    }\r\n    printf(\"Shutdown gracefully.\\n\");\r\n    return 0;\r\n}\r\n<\/code><\/pre>\n<p>\u6b64\u673a\u5236\u5e38\u7528\u4e8e<strong>\u7f8e\u56fd\u4e91\u670d\u52a1\u5668<\/strong>\u4e2d\u7684\u5b88\u62a4\u8fdb\u7a0b\u3001\u5b89\u5168\u63a7\u5236\u548c\u8d44\u6e90\u6e05\u7406\u903b\u8f91\u3002<\/p>\n<h2>\u7ed3\u8bed\uff1a\u6280\u672f\u7ec6\u8282\u51b3\u5b9a\u670d\u52a1\u5668\u5e94\u7528\u7684\u6210\u8d25<\/h2>\n<p>\u65e0\u8bba\u662f\u6784\u5efa I\/O \u5bc6\u96c6\u578b\u670d\u52a1\u8fd8\u662f\u9ad8\u5e76\u53d1\u5904\u7406\u5f15\u64ce\uff0c\u6df1\u5165\u7406\u89e3\u7cfb\u7edf\u8c03\u7528\u3001\u6587\u4ef6\u7cfb\u7edf\u4ee5\u53ca\u4fe1\u53f7\u673a\u5236\uff0c\u90fd\u662f\u6784\u5efa\u9ad8\u8d28\u91cf\u670d\u52a1\u5668\u5e94\u7528\u7684\u57fa\u77f3\u3002\u7279\u522b\u662f\u5728\u9009\u62e9<strong>\u7f8e\u56fd\u670d\u52a1\u5668<\/strong>\u4ea7\u54c1\u65f6\uff0c\u914d\u5408\u5e95\u5c42\u63a7\u5236\u624b\u6bb5\uff0c\u80fd\u5145\u5206\u6316\u6398\u670d\u52a1\u5668\u8d44\u6e90\u6f5c\u529b\uff0c\u63d0\u5347\u6574\u4f53\u4e1a\u52a1\u6027\u80fd\u3002<\/p>\n<p>\u9009\u62e9\u5177\u5907\u9ad8\u53ef\u7528\u7f51\u7edc\u3001\u5feb\u901f\u78c1\u76d8IO\u80fd\u529b\u7684\u4f18\u8d28\u670d\u52a1\u5668\uff0c\u662f\u5f00\u53d1\u8005\u7684\u5173\u952e\u4e00\u6b65\u3002\u4e86\u89e3\u66f4\u591a\u53ef\u8bbf\u95ee\uff1a<a href=\"https:\/\/fwq.ai\/\">\u7f8e\u56fd\u670d\u52a1\u5668<\/a>\uff0c\u9009\u62e9\u9002\u5408\u4f60\u7684\u9ad8\u6027\u80fd\u7f8e\u56fd\u670d\u52a1\u5668\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; \u5f15\u8a00 \u5728\u6784\u5efa\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u5e94\u7528\u65f6\uff0c\u5e95\u5c42\u7cfb\u7edf\u8c03\u7528\u7684\u8fd0\u7528\u662f\u7ed5\u4e0d\u5f00\u7684\u8bdd\u9898\u3002\u7279\u522b\u662f\u4f7f\u7528C\u8bed\u8a00\u8fdb\u884c\u5f00\u53d1\u7684\u6280\u672f\u4eba\u5458\uff0c\u4e86\u89e3\u7cfb\u7edf\u8c03\u7528\u4e0e\u6807\u51c6\u5e93\u51fd\u6570\u7684\u533a\u522b\uff0c\u4e0d\u4ec5\u6709\u52a9\u4e8e\u4f18\u5316\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u8fd8\u80fd\u66f4\u597d\u5730\u5e94\u5bf9\u9ad8\u5e76\u53d1\u73af\u5883\u4e2d\u5bf9\u8d44\u6e90\u7ba1\u7406\u7684\u7cbe\u7ec6\u5316\u9700\u6c42\u3002\u5728\u90e8\u7f72\u7f8e\u56fd\u4e91\u670d\u52a1\u5668\u7b49\u57fa\u7840\u67b6\u6784\u65f6\uff0c\u8fd9\u4e9b\u5e95\u5c42\u77e5\u8bc6\u5c24\u4e3a\u91cd\u8981\u3002 \u7cfb\u7edf\u8c03\u7528\uff1a\u8fde\u63a5\u7528\u6237\u7a0b\u5e8f\u4e0e\u5185\u6838\u7684\u6865\u6881 \u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u7cfb\u7edf\u8c03\u7528\uff08System 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\u5b9e\u9645\u662f\u5bf9\u7cfb\u7edf\u8c03\u7528\u7684\u5c01\u88c5\uff0c\u5b83\u4eec\u901a\u8fc7\u589e\u52a0\u7f13\u51b2\u673a\u5236\u63d0\u5347\u6027\u80fd\uff0c\u4f46\u5728\u6781\u7aef\u573a\u666f\uff08\u5982\u9ad8\u5e76\u53d1\u65e5\u5fd7\u5199\u5165\uff09\u4e2d\u53ef\u80fd\u4e0d\u5982\u7cfb\u7edf\u8c03\u7528\u7075\u6d3b\u3002\u5bf9\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u7406\u89e3\u5176\u80cc\u540e\u7684\u5de5\u4f5c\u539f\u7406\u6709\u52a9\u4e8e\u5728\u7f8e\u56fdVPS\u4e0a\u4f18\u5316\u8d44\u6e90\u8c03\u5ea6\u4e0eI\/O\u5904\u7406\u903b\u8f91\u3002 \u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff0c\u6f14\u793a\u4e86\u57fa\u672c\u7684\u6587\u4ef6\u5199\u64cd\u4f5c\uff1a #include &lt;fcntl.h&gt; #include &lt;unistd.h&gt; #include &lt;stdio.h&gt; int main() { int fd = open(&#8220;demo.txt&#8221;, O_CREAT | O_WRONLY, 0644); if (fd == -1) { perror(&#8220;open failed&#8221;); return 1; } write(fd, &#8220;Hello from server\\n&#8221;, 18); close(fd); return 0; } 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