stat | 易学教程

File size of virtual file

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问题 I'm using FUSE to create an overlay filesystem, where directories are augmented with virtual entities. I am setting the file size of these entities to 0, because I have no way of knowing -- ahead of reading them, which is particularly expensive in my case -- what they should be. However, there seems to be an obvious optimisation taking place, insofar as zero-length files don't incur any read call (only open and release ). My question therefore is simply, what should I set the file size to? I

Link column with link to a file in static (django-tables2, Django)

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问题 I generate a table with django-tables within Django. I want to create a column with links to txt files in my static directory. When the user clicks on the link, the txt file should be displayed. To create a link to the txt file within an html, I simply do: <a href="{% static co.log %}">txtfile</a> However, I have problems finding the right way to do this using django-tables. I tried to define the link column as follows: logfiles = tables.LinkColumn('{static', text='txtfile', args=[A('log')],

C strange stat st_mode [duplicate]

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问题 This question already has answers here : stat() error 'No such file or directory' when file name is returned by readdir() (2 answers) Closed 3 years ago . I am printing the result of S_ISDIR(info->st_mode) and S_ISREG(info->st_mode) over a directory that contains dynamic libraries with .so extension and the result is quite surprising, S_ISREG returns 0 while S_ISDIR returns 1. I am a bit confused... The code: DIR *dir; if ((dir = opendir (dirname)) != NULL) { struct dirent *ent; while ((ent =

实现mypwd

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实现mypwd 学习pwd命令查看pwd命令的帮助信息man pwd 显示当前目录所在路径 pwd 显示当前目录的物理路径 pwd –P 显示当前目录的连接路径 pwd -L pwd = Print Working Directory :打印当前目录(当前用户所位于的目录)。它会打印出以根目录(/)为起点的完整目录名（绝对目录）。这条命令是一条 shell 内建命令，并且在大多数 shell 中都可以使用，如 bash Bourne shell ksh zsh 等。注意： pwd 通常不带选项运行，且没有任何参数重要：运行的都是 /bin/pwd 而不是 pwd 。区别： pwd 意味着使用 shell 内置的 pwd ， shell 可能有不同版本的pwd，具体请参考手册。当使用的是 /bin/pwd 时，则调用二进制版本的命令。虽然二进制的版本有更多的选项，但是它们两者都能打印当前的目录。研究pwd实现需要的系统调用(man -k; grep),写出伪代码 man -k directory | grep 2 寻找实现打印当前目录的系统调用函数 linux stat函数表头文件: #include <sys/stat.h> #include <unistd.h> 定义函数: int stat(const char *file_name, struct stat

c++获取文件的修改时间

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跨平台，linux和windows平台都可以编译 #include <sys/types.h> #include <sys/stat.h> #ifndef WIN32 #include <unistd.h> #endif #ifdef WIN32 #define stat _stat #endif int64_t get_mtime() { auto filename = "/path/to/file"; struct stat result; if(stat(filename.c_str(), &result)==0) { auto mod_time = result.st_mtime; return mod_time; } return -1; } 引用 https://stackoverflow.com/questions/40504281/c-how-to-check-the-last-modified-time-of-a-file 来源： CSDN 作者：阿龙哥哥链接： https://blog.csdn.net/v6543210/article/details/103463787

How to get r.squared for each regression?

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问题 Im working with a huge data frame with structure similar to the followings. I use output_reg to store slope and intercept for each treatment but I need to add r.squared for each lm (y~x) and store it in another column besides the other two. Any hint on that? library(plyr) field <- c('t1','t1','t1', 't2', 't2','t2', 't3', 't3','t3') predictor <- c(4.2, 5.3, 5.4,6, 7,8.5,9, 10.1,11) response <- c(5.1, 5.1, 2.4,6.1, 7.7,5.5,1.99, 5.42,2.5) my_df <- data.frame(field, predictor, response,

抖音越狱检测深度分析

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如有合作，交流方面的意愿，请联系QQ：571652571 iOS抖音App安全机制分析准备工作工具在本文中，用到的工具有IDA Pro, Frida, TheOS，文本编辑器(如VSCode) 脱壳首先我们进行静态分析，第一步要脱壳，市面上常见的工具有dump-decrypted/frida-ios-dump/clutch等工具。使用frida查看App加载了哪些自带动态库，并对这些模块进行脱壳: Process.enumerateModulesSync().forEach(function(e){if(e.path.indexOf('.app')!=-1){console.log(e.path)}}) .../Aweme.app/Aweme .../Aweme.app/Frameworks/AgoraRtcEngineKit.framework/AgoraRtcEngineKit .../Frameworks/ByteRtcEngineKit.framework/ByteRtcEngineKit .../Aweme.app/Frameworks/AwemeDylib.framework/AwemeDylib 越狱检测分析由于抖音二进制相当大，单单IDA分析便需要几十分钟，而越狱逻辑可能隐藏在任何地方，而不限于在进程初始化时(mod_init_func)

mv: cannot stat error : No such file or directory error

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问题 I need to move the files of a directory to another directory.I get stat error when I used the following program. for i in dir1/*.txt_dir; do mv $i/*.txt dir2/`basename $i`.txt done error message mv: cannot stat `dir1/aa7.txt_dir/*.txt': No such file or directory 回答1: Normally, when a glob which does not match any filenames is expanded, it remains unchanged. Thus, you get results like this: $ rm .bak rm: cannot remove ` .bak': No such file or directory To avoid this we need to change the

Linux中安装使用memcached

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转至： http://www.czhphp.com/archives/252 如何将 memcached 融入到您的环境中？在开始安装和使用 using memcached 之前，我们需要了解如何将 memcached 融入到您的环境中。虽然在任何地方都可以使用 memcached，但我发现需要在数据库层中执行几个经常性查询时，memcached 往往能发挥最大的效用。我经常会在数据库和应用服务器之间设置一系列 memcached 实例，并采用一种简单的模式来读取和写入这些服务器。图 1 可以帮助您了解如何设置应用程序体系结构：图 1. 使用 memcached 的示例应用程序体系结构体系结构相当容易理解。我建立了一个 Web 层，其中包括一些 Apache 实例。下一层是应用程序本身。这一层通常运行于 Apache Tomcat 或其他开源应用服务器之上。再下面一层是配置 memcached 实例的地方 — 即应用服务器与数据库服务器之间。在使用这种配置时，需要采用稍微不同的方式来执行数据库的读取和写入操作。读取我执行读取操作的顺序是从 Web 层获取请求（需要执行一次数据库查询）并检查之前在缓存中存储的查询结果。如果我找到所需的值，则返回它。如果未找到，则执行查询并将结果存储在缓存中，然后再将结果返回给 Web 层。写入将数据写入到数据库中时

How to flush nfs attribute cache?

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问题 I need to find a way to flush the NFS attribute cache on the client side. stat() call reads ctime from attribute cache and not the actual value, takes upto 3 second for the actual value to be reflected in cache. using 'noac' option when mounting works but will affect performance in the long run. I came across solutions like doing a chown on the same owner of the file etc. but is there a proper method to flush the attribute cache before doing a stat()? and this prob happens only on Redhat