{"id":17793,"date":"2024-11-18T14:27:21","date_gmt":"2024-11-18T06:27:21","guid":{"rendered":"https:\/\/fwq.ai\/blog\/17793\/"},"modified":"2024-11-18T14:27:21","modified_gmt":"2024-11-18T06:27:21","slug":"linux%e8%bf%9b%e7%a8%8b%e4%b8%ba%e4%bd%95%e4%bc%9a%e8%bf%9b%e5%85%a5%e7%9d%a1%e7%9c%a0%e7%8a%b6%e6%80%81%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/17793\/","title":{"rendered":"Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff1f"},"content":{"rendered":"

\"Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff1f\u63d2\u56fe\"<\/p>\n

Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff1f<\/p>\n

\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u8fdb\u7a0b\u53ef\u80fd\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u8fd9\u662f\u56e0\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u7684\u8c03\u5ea6\u7b56\u7565\u3001\u8d44\u6e90\u5206\u914d\u4ee5\u53ca\u8fdb\u7a0b\u4e4b\u95f4\u7684\u7ade\u4e89\u5173\u7cfb\u7b49\u56e0\u7d20\u90fd\u53ef\u80fd\u5bfc\u81f4\u8fdb\u7a0b\u8fdb\u5165\u7761\u7720\u72b6\u6001\u3002\u7761\u7720\u72b6\u6001\u662f\u6307\u8fdb\u7a0b\u4e0d\u80fd\u7acb\u5373\u6267\u884c\uff0c\u9700\u8981\u7b49\u5f85\u4e00\u5b9a\u6761\u4ef6\u6ee1\u8db3\u540e\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u540c\u65f6\u4f1a\u9644\u4e0a\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u8bf4\u660e\u3002<\/p>\n

    \n
  1. \u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210
    \u4e00\u4e2a\u5e38\u89c1\u7684\u60c5\u51b5\u662f\u5f53\u8fdb\u7a0b\u6267\u884c\u4e00\u4e2a\u9700\u8981\u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210\u7684\u7cfb\u7edf\u8c03\u7528\u65f6\uff0c\u6bd4\u5982\u8bfb\u53d6\u6587\u4ef6\u3001\u7f51\u7edc\u6570\u636e\u4f20\u8f93\u7b49\uff0c\u8fdb\u7a0b\u4f1a\u88ab\u7f6e\u4e8e\u7761\u7720\u72b6\u6001\uff0c\u76f4\u5230I\/O\u64cd\u4f5c\u5b8c\u6210\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u8fdb\u7a0b\u4e00\u76f4\u5360\u7528CPU\u8d44\u6e90\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\uff1a<\/li>\n<\/ol>\n
    #include <stdio.h>\n#include <unistd.h>\n#include <fcntl.h>\n\nint main() {\n    int fd = open(\"file.txt\", O_RDWR);   \n    char buffer[100];\n    read(fd, buffer, 100);  \/\/ \u8bfb\u53d6\u6587\u4ef6\uff0c\u8fdb\u7a0b\u4f1a\u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210\n    close(fd);\n    \n    return 0;\n}<\/fcntl.h><\/unistd.h><\/stdio.h><\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \n
    1. \u7b49\u5f85\u4fe1\u53f7
      \u8fdb\u7a0b\u53ef\u80fd\u4f1a\u56e0\u4e3a\u7b49\u5f85\u67d0\u4e2a\u4fe1\u53f7\u800c\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u6bd4\u5982\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\u7684SIGCHLD\u4fe1\u53f7\u3002\u5f53\u5b50\u8fdb\u7a0b\u7ed3\u675f\u65f6\uff0c\u7236\u8fdb\u7a0b\u4f1a\u6536\u5230\u8be5\u4fe1\u53f7\u5e76\u5524\u9192\u7761\u7720\u4e2d\u7684\u8fdb\u7a0b\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\uff1a<\/li>\n<\/ol>\n
      #include <stdio.h>\n#include <signal.h>\n#include <unistd.h>\n#include <sys>\n\nvoid sigchld_handler(int signum) {\n    printf(\"\u6536\u5230\u5b50\u8fdb\u7a0b\u7ed3\u675f\u4fe1\u53f7\n\");\n}\n\nint main() {\n    signal(SIGCHLD, sigchld_handler);  \/\/ \u6ce8\u518cSIGCHLD\u4fe1\u53f7\u5904\u7406\u51fd\u6570\n    pid_t pid = fork();\n    if (pid == 0) {\n        printf(\"\u5b50\u8fdb\u7a0b\u8fd0\u884c\u4e2d\n\");\n        sleep(2);\n        printf(\"\u5b50\u8fdb\u7a0b\u7ed3\u675f\n\");\n    } else {\n        printf(\"\u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\n\");\n        wait(NULL);  \/\/ \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\n    }\n    \n    return 0;\n}<\/sys><\/unistd.h><\/signal.h><\/stdio.h><\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u4ee5\u4e0a\u662f\u5173\u4e8eLinux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\u7684\u7b80\u8981\u4ecb\u7ecd\u4ee5\u53ca\u4ee3\u7801\u793a\u4f8b\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fdb\u7a0b\u8fdb\u5165\u7761\u7720\u72b6\u6001\u662f\u6b63\u5e38\u7684\u7cfb\u7edf\u8c03\u5ea6\u8fc7\u7a0b\uff0c\u5728\u5408\u9002\u7684\u65f6\u5019\u7cfb\u7edf\u4f1a\u5524\u9192\u8fd9\u4e9b\u8fdb\u7a0b\u5e76\u7ee7\u7eed\u6267\u884c\uff0c\u8fd9\u6709\u5229\u4e8e\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u8d44\u6e90\u5229\u7528\u7387\u3002<\/p>\n
      \u4ee5\u4e0a\u5c31\u662fLinux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff1f \u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u8fdb\u7a0b\u53ef\u80fd\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u8fd9\u662f\u56e0\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u7684\u8c03\u5ea6\u7b56\u7565\u3001\u8d44\u6e90\u5206\u914d\u4ee5\u53ca\u8fdb\u7a0b\u4e4b\u95f4\u7684\u7ade\u4e89\u5173\u7cfb\u7b49\u56e0\u7d20\u90fd\u53ef\u80fd\u5bfc\u81f4\u8fdb\u7a0b\u8fdb\u5165\u7761\u7720\u72b6\u6001\u3002\u7761\u7720\u72b6\u6001\u662f\u6307\u8fdb\u7a0b\u4e0d\u80fd\u7acb\u5373\u6267\u884c\uff0c\u9700\u8981\u7b49\u5f85\u4e00\u5b9a\u6761\u4ef6\u6ee1\u8db3\u540e\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8Linux\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u540c\u65f6\u4f1a\u9644\u4e0a\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u8bf4\u660e\u3002 \u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210\u4e00\u4e2a\u5e38\u89c1\u7684\u60c5\u51b5\u662f\u5f53\u8fdb\u7a0b\u6267\u884c\u4e00\u4e2a\u9700\u8981\u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210\u7684\u7cfb\u7edf\u8c03\u7528\u65f6\uff0c\u6bd4\u5982\u8bfb\u53d6\u6587\u4ef6\u3001\u7f51\u7edc\u6570\u636e\u4f20\u8f93\u7b49\uff0c\u8fdb\u7a0b\u4f1a\u88ab\u7f6e\u4e8e\u7761\u7720\u72b6\u6001\uff0c\u76f4\u5230I\/O\u64cd\u4f5c\u5b8c\u6210\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u8fdb\u7a0b\u4e00\u76f4\u5360\u7528CPU\u8d44\u6e90\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\uff1a #include <stdio.h> #include <unistd.h> #include <fcntl.h> int main() { int fd = open(“file.txt”, O_RDWR); char buffer[100]; read(fd, buffer, 100); \/\/ \u8bfb\u53d6\u6587\u4ef6\uff0c\u8fdb\u7a0b\u4f1a\u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210 close(fd); return 0; }<\/fcntl.h><\/unistd.h><\/stdio.h> \u767b\u5f55\u540e\u590d\u5236 \u7b49\u5f85\u4fe1\u53f7\u8fdb\u7a0b\u53ef\u80fd\u4f1a\u56e0\u4e3a\u7b49\u5f85\u67d0\u4e2a\u4fe1\u53f7\u800c\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u6bd4\u5982\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\u7684SIGCHLD\u4fe1\u53f7\u3002\u5f53\u5b50\u8fdb\u7a0b\u7ed3\u675f\u65f6\uff0c\u7236\u8fdb\u7a0b\u4f1a\u6536\u5230\u8be5\u4fe1\u53f7\u5e76\u5524\u9192\u7761\u7720\u4e2d\u7684\u8fdb\u7a0b\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\uff1a #include <stdio.h> #include <signal.h> #include <unistd.h> #include <sys> void sigchld_handler(int signum) { printf(“\u6536\u5230\u5b50\u8fdb\u7a0b\u7ed3\u675f\u4fe1\u53f7 “); } int main() { signal(SIGCHLD, sigchld_handler); \/\/ \u6ce8\u518cSIGCHLD\u4fe1\u53f7\u5904\u7406\u51fd\u6570 pid_t pid = […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-17793","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/17793","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=17793"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/17793\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=17793"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=17793"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=17793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}