{"id":67627,"date":"2022-07-22T20:24:24","date_gmt":"2022-07-22T12:24:24","guid":{"rendered":"http:\/\/www.idc.net\/help\/67627\/"},"modified":"2022-07-22T20:24:24","modified_gmt":"2022-07-22T12:24:24","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-linux-%e6%9f%a5%e7%9c%8b%e6%96%87%e4%bb%b6%e5%8f%a5%e6%9f%84%ef%bc%9f%ef%bc%88linux%e6%9f%a5%e7%9c%8b%e6%96%87%e4%bb%b6%e5%8f%a5%e6%9f%84%ef%bc%89","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/67627\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Linux \u67e5\u770b\u6587\u4ef6\u53e5\u67c4\uff1f\uff08linux\u67e5\u770b\u6587\u4ef6\u53e5\u67c4\uff09"},"content":{"rendered":"

\u4e00\u4e2a\u6587\u4ef6\u53e5\u67c4\u662f\u4e00\u4e2a\u6807\u8bc6\u7b26\uff0c\u80fd\u591f\u7528\u6765\u786e\u5b9a\u8f6f\u4ef6\u7a0b\u5e8f\u5bf9\u6587\u4ef6\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u5b83\u4ee3\u8868\u4e00\u4e2a\u7279\u5b9a\u6587\u4ef6\u7684\u6253\u5f00\u5b9e\u4f8b\u3002\u6709\u65f6\u5019\uff0c\u9700\u8981\u67e5\u770bLinux\u7cfb\u7edf\u4e2d\u5df2\u7ecf\u6253\u5f00\u7684\u6587\u4ef6\u53e5\u67c4\uff0c\u4ee5\u4e0b\u662f\u4f7f\u7528Linux\u67e5\u770b\u6587\u4ef6\u53e5\u67c4\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

### \u4e00\u3001\u4f7f\u7528 lsof \u547d\u4ee4<\/p>\n<\/p>\n

lsof\u662fList open Files\u7684\u7f29\u5199\uff0c\u662f\u4e00\u79cd\u5e38\u89c1\u7684Linux\u7cfb\u7edf\u547d\u4ee4\uff0c\u7528\u6765\u67e5\u770b\u5f53\u524d\u7cfb\u7edf\u4e2d\u6b63\u5728\u8bbf\u95ee\u6587\u4ef6\u7684\u8fdb\u7a0b\u4ee5\u53ca\u5b83\u4eec\u6b63\u5728\u4f7f\u7528\u7684\u6587\u4ef6\u53e5\u67c4\u3002\u4f8b\u5982\uff0c\u8981\u67e5\u770b\/etc\/hosts\u6587\u4ef6\u7684\u6587\u4ef6\u53e5\u67c4\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<\/p>\n

\u201c`shell<\/p>\n

lsof \/etc\/hosts<\/p>\n


\u8fd9\u5c06\u663e\u793a\u6240\u6709\u6b63\u5728\u4f7f\u7528\u8be5\u6587\u4ef6\u7684\u8fdb\u7a0b\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u6587\u4ef6\u53e5\u67c4\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a

<\/pre>\n
COMMAND PID USER FD TYPE DEVICE SIZE\/OFF NODE NAME <\/p>\n
sshd 1043 root 5u IPv6 30742 0t0 UDP *:58204 <\/p>\n

### \u4e8c\u3001\u4f7f\u7528fcntl \u51fd\u6570

Linux\u7cfb\u7edf\u4e5f\u63d0\u4f9bfcntl\u51fd\u6570\u6765\u83b7\u53d6\u548c\u8bbe\u7f6e\u6587\u4ef6\u53e5\u67c4\u7684\u7279\u6027\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cfcntl\u51fd\u6570\u9700\u8981\u5b9e\u73b0\u4e09\u79cd\u64cd\u4f5c\uff1a\u8bfb\u53d6\u3001\u5199\u5165\u548c\u7ed9\u5b9a\u7684\u6587\u4ef6\u53e5\u67c4\u8bbe\u7f6e\u5c5e\u6027\u3002

\u4f8b\u5982\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u4f7f\u7528fcntl\u51fd\u6570\u8bfb\u53d6\u6587\u4ef6\u53e5\u67c4fd\u7684\u6587\u4ef6\u72b6\u6001\u6807\u5fd7\uff0c\u5e76\u5c06\u7ed3\u679c\u5b58\u50a8\u5728var\u4e2d\uff1a

```c
int fd; \/\/\u6587\u4ef6\u53e5\u67c4
int var; \/\/\u53d8\u91cf
\/\/ \u8bfb\u53d6\u6587\u4ef6\u7684\u72b6\u6001\u6807\u5fd7\uff0c\u5e76\u5b58\u50a8\u5728var\u4e2d
var = fcntl(fd, F_GETFL, 0); 
<\/pre>\n<\/p>\n
### \u4e09\u3001\u4f7f\u7528strace\u547d\u4ee4<\/p>\n<\/p>\n
strace\u547d\u4ee4\u53ef\u4ee5\u7528\u6765\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u56e0\u6b64\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u8fd0\u884c\u4e2d\u7684\u8fdb\u7a0b\u6b63\u5728\u4f7f\u7528\u54ea\u4e9b\u6587\u4ef6\u53e5\u67c4\u3002\u4f8b\u5982\uff0c\u8981\u68c0\u67e5apache2\u8fdb\u7a0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<\/p>\n
\u201c`shell<\/p>\n
strace -e trace=file -p $PID<\/p>\n

\u5176\u4e2dPID\u662fapache2\u8fdb\u7a0b\u7684\u8fdb\u7a0bID\u3002\u8be5\u547d\u4ee4\u5c06\u663e\u793aapache2\u6b63\u5728\u4f7f\u7528\u54ea\u4e9b\u6587\u4ef6\u53e5\u67c4\uff0c\u53ca\u5176\u4ed6\u76f8\u5173\u4fe1\u606f\u3002

\u4ee5\u4e0a\u662fLinux\u67e5\u770b\u6587\u4ef6\u53e5\u67c4\u7684\u51e0\u79cd\u65b9\u6cd5\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u4e0d\u540c\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\uff0c\u56e0\u6b64\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u6765\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002
<\/pre>\n
\u9999\u6e2f\u670d\u52a1\u5668<\/a>\u9996\u9009\u540e\u6d6a\u4e91\uff0c2H2G\u9996\u670810\u5143\u5f00\u901a\u3002
\u540e\u6d6a\u4e91\uff08www.IDC.Net\uff09\u63d0\u4f9b\u7b80\u5355\u597d\u7528\uff0c\u4ef7\u683c\u539a\u9053\u7684\u9999\u6e2f\/\u7f8e\u56fd\u4e91\u670d\u52a1\u5668\u548c\u72ec\u7acb\u670d\u52a1\u5668\u3002IDC+ISP+ICP\u8d44\u8d28\u3002ARIN\u548cAPNIC\u4f1a\u5458\u3002\u6210\u719f\u6280\u672f\u56e2\u961f15\u5e74\u884c\u4e1a\u7ecf\u9a8c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u4e2a\u6587\u4ef6\u53e5\u67c4\u662f\u4e00\u4e2a\u6807\u8bc6\u7b26\uff0c\u80fd\u591f\u7528\u6765\u786e\u5b9a\u8f6f\u4ef6\u7a0b\u5e8f\u5bf9\u6587\u4ef6\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u5b83\u4ee3\u8868\u4e00\u4e2a\u7279\u5b9a\u6587\u4ef6\u7684\u6253\u5f00\u5b9e\u4f8b\u3002\u6709\u65f6\u5019\uff0c\u9700\u8981\u67e5\u770b […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-67627","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/67627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=67627"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/67627\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=67627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=67627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=67627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}