I am developing a bootloader in x86 Assembly and I have a question about the FAT file system.
Which steps are necessary to find and load the file?
PHP: path is incorrect while running script from cron
php,linux,cron,include,filesystems
In my case I solved this with a code like this: include_once __DIR__ . '/DB/mysql.php'; ...
Storing images in MSSQL vs Disk
sql-server,image,filesystems,storage
You shoud store images in disk and its path should be stored in database. If you want to re size image(use your C# codes) put it into another folder and store its path in db For more detail you can see Storing Images in DB - Yea or Nay? PHP...
Ruby process to index files on a linux filesystem
mysql,ruby-on-rails,ruby,linux,filesystems
You will want to look into inotify. https://github.com/nex3/rb-inotify You can set a watch (register a callback in the Linux kernel) on a file or a directory, and everytime something changes in that file/directory, the kernel will notify you immediately with a list of what has changed. Common events are listed...
How to convert filename with invalid UTF-8 characters back to bytes?
python,python-3.x,unicode,utf-8,filesystems
Use an error handler; in this case the surrogateescape error handler looks appropriate: Value: 'surrogateescape' Meaning: On decoding, replace byte with individual surrogate code ranging fromU+DC80toU+DCFF. This code will then be turned back into the same byte when the'surrogateescape'` error handler is used when encoding the data. (See PEP 383...
How is a file loaded in the FAT file system?
There is no simple answer, so I won't delve into it here. You have to peek into the FAT (File Allocation Table) structures on the disk: https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system More, Reference: https://en.wikipedia.org/wiki/File_Allocation_Table...
Filesystem independent way of using glob.glob and regular expressions with unicode filenames in Python
python,regex,python-3.x,unicode,filesystems
I'm assuming you want to match unicode equivalent filenames, e.g. you expect an input pattern of u'\xE9*' to match both filenames u'\xE9qui' and u'e\u0301qui' on any operating system, i.e. character-level pattern matching. You have to understand that this is not the default on Linux, where bytes are taken as bytes,...
rmdir (2) used for directory tree removal
filesystems,standards,system-calls,syscall,standards-compliance
According to the "official" spec, http://pubs.opengroup.org/onlinepubs/9699919799//functions/rmdir.html , no. It clearly says "The directory shall be removed only if it is an empty directory., and further If the directory is not an empty directory, rmdir() shall fail and set errno to [EEXIST] or [ENOTEMPTY].. Anyway, I suspect such a filesystem supporting...
How should I read the filename in FILE_NOTIFY_INFORMATION struct
c++,winapi,filesystems,file-monitoring,readdirectorychangesw
You have a number of problems that I can see immediately: According to the docs for the ReadDirectoryChangesW function, the buffer needs to be DWORD-aligned. As you are using a buffer on the stack this isn't guaranteed - you should allocate one from the heap instead. You don't seem to...
Travis CI is not case-sensitive by default?
filesystems,phpunit,composer-php,travis-ci,case-sensitive
PHP is not case sensitive when it comes to class names. If your code declares a class named Foo, and this definition is executed, you can also instantiate any other case style, like foo or fOO. PHP will preserve the case of the occurrence that triggers the autoload (i.e. the...
Setting Timestamps on files/directories is extremely slow
I'm not a C# programmer and I don't know how those System.IO.FileSystemInfo methods are implemented. But I've made a few tests with the WIN32 API function SetFileTime(..) which will be called by C# at some point. Here is the code snippet of my benchmark-loop: #define NO_OF_ITERATIONS 100000 int iteration; DWORD...
When working with NodeJS FS mkdir, what is the importance of including callbacks?
javascript,node.js,callback,filesystems
The callback is required when you need to know if/when the call succeeded. If you don't care when it's done or don't care to see if there is an error, then you don't have to pass the callback. Remember, this type of function is asynchronous. It completes some unknown time...
How to echo out the contents of every text file that in a directory?
You could use file_get_contents to put the file into a string. <?php $blacklist = array("index.php"); if ($handle = opendir('.')) { while (false !== ($entry = readdir($handle))) { if ($entry != "." && $entry != ".." && !in_array($entry, $blacklist)) { echo "$entry " . file_get_contents($entry) . "\n"; } } closedir($handle); }...
How do I create a file with boost filesystem without opening it
Boost Filesystem V3 doesn't provide a touch(1) function; Even touch will creat+close a file, just look at the output of strace: open("/tmp/q", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK, 0666) = 47 dup2(47, 0) = 0 close(47) = 0 utimensat(0, NULL, NULL, 0) = 0 I think your most reasonable bet is to just create a...
Images stored on disk - search by name
As the marked answer in the question you linked states: Do not store images in the database. Store images in directories and store references to the images in the database. Thus, your query would become select path where name like %my_substring% (where path is the name of the column where...
What is the best way to write and append a large file in java
java,web-services,hadoop,filesystems,hdfs
1) You are opening a new writer every time, without closing the previous writer object. 2) Don't open the file for each write operation, instead open it before the loop, and close it after the loop. BufferedWriter writer = new BufferedWriter(new FileWriter(path, true)); do{ String resultData = HTTP.GET <uri>; writer.write(resultData...
Mount ext4 file system with msdos partition table
linux,filesystems,mount,ext4,fdisk
sudo mount -t ext4 /dev/sdb/ /media/backup/ is wrong in 2 aspects: the trailing / after sdb is wrong: /dev/sdb is not a directory, but a device node. sdb itself is wrong as it refers to the whole device, not to the partiotion with the file system. Do sudo mount -t...
unknown field 'ioctl' specified in initializer
linux,linux-kernel,filesystems,ioctl
ioctl has been renamed to unlocked_ioctl. E.g, see that article: http://lwn.net/Articles/115651/ Other operations from struct file_operations, mentioned in LDD3, haven't been changed....
Child directory sizes and owners
So something along the lines of this then? $start = "c:\temp" $output = "C:\temp\output.csv" Get-ChildItem $start | Where-Object{$_.PSIsContainer} | ForEach-Object{ $singleFolder = $_.FullName $folderSize = Get-ChildItem $singleFolder -Recurse -Force | Where-Object{!$_.PSIsContainer} | Measure-Object -Property length -sum | Select-Object -ExpandProperty Sum $folderSize = [math]::round($folderSize/1MB, 2) $owner = Get-Acl $singleFolder | Select-Object...
mysql release deleted tables
I've run into this problem before. Create the database name and drop the database then it releases that namespace.
Delete unused files and folders in an existing project
javascript,php,file,filesystems,folders
I think sometimes its quicker to write things from scratch rather than work with "Megamoth" but if you need to keep it running you probably need to put it into some kind of version control system. I recommend Git http://en.wikipedia.org/wiki/Git_%28software%29 https://git-scm.com/ and just start refractoring it. Version control system will...
Hadoop HDFS is not distributing blocks of data evenly
As the hdfs dfs -ls output shows, your replication factor is set to 1, so there is no compelling reason for hdfs to distribute the data blocks on the datanodes. You need to increase the replication level to at least 2 to get what you expect, eg: hdfs dfs -setrep...
Infinite loop when I read from /proc which is implemented with seq_file
linux,linux-kernel,filesystems
Your forget to update *pos parameter in your _next handler. Usually, it is incremented by 1 every _next call. UPDATE: Also your _start handler should navigate to given position. Infinite loop is actually a consequence of cat implementation: it call read(2) until it returns 0 or -1. Because of your...
Find string in log files and return extra characters
You can use regex for grub the text : import re for file in glob.glob('*.log'): with open(file) as f: contents = f.read() if 'FIRMWARE_VERSION = "' in contents: print (file + '='+ re.search(r'FIRMWARE_VERSION ="([\d.]+)"',contents).group(1)) In this case re.search will do the job! with searching the file content based on the...
System time and file system time are not the same
linux,file,time,filesystems,kernel
The usual way to address this is to synchronize the clocks on all of the machines to a common time reference using ntp (usually to a reliable time server). The NTP FAQ and HOWTO is a good place to start. For most Linux servers, just installing the ntp package takes...
Traversing `vm_area_struct`'s of a process
c,linux,linux-kernel,filesystems,mmap
It has a separate vm_area_struct for each map section. If you look at the code in fs/proc/task_mmu.c, functions m_start() and m_next, you'll see that the lines in the maps pseudo-file are created by iteratively traversing the process vma list. Also, note the comment on the struct vm_area_struct declaration: /* *...
Uploaded file not saving to file system
c#,asp.net,asp.net-mvc,asp.net-mvc-5,filesystems
Use the SaveAs method of the HttpPostedFile object: upload.SaveAs("Path\\to\\image\\directory"); ...
ENOENT ERROR using fs.unlink in a Express.js Simple APP?
javascript,json,node.js,express,filesystems
The problem is that you are not passing the variable slug anywhere to your remove route. Since you are using GET it can't come from req.body, so you have to either pass it in the URL path or as query string. Try changing these lines: post.js var oldSlug = "public/"+req.query.slug+".md";...
Operating Systems - File system on SSD vs Rotational
operating-system,filesystems,ssd
A filesystem on rotational media is designed to minimize the amount of seeking that is needed to read the blocks that make up a file. In the ideal case, the blocks of a file are contiguous on disk. If a file is small enough, it will be placed in a...
Directory.GetFiles() performance issues
c#,performance,linq,filesystems
The first way is slow for 2 reasons: You're constructing a FileInfo object for each file. There's no need for this if all you want is the file name. Constructing a FileInfo is relatively light, but it's unnecessary and all the instantiations will slow you down if you're querying a...
About Linux file system
You can see from the df output that /dev/mapper/fedora-home can currently be reached at /home which is its mount point. Because the mount point for /dev/mapper/fedora-root is at / farther up the directory tree, anything that /dev/mapper/fedora-root has in /home is not accessible by normal means until and unless /dev/mapper/fedora-home...
Trying to delete a directory and his hidden files in linux with php
Finally with this: system('rm -fr /path/dir && mkdir /path/dir); I removed the directory with all his files and after I created the directory. And the work is done....
What's the “atomic disk write” for a Linux filesystem?
linux,apache,http,nginx,filesystems
This actually depends on the filesystem being used. This is probably referring to the stat.blksize filesystem attribute. From the stat(2) manual page: struct stat { /* ... */ blksize_t st_blksize; /* blocksize for filesystem I/O */ The -f option to the stat(1) appears to display this information, and on my...
How to get OpenResult from IRP_MJ_CREATE callback?
c,windows,filesystems,kernel,driver
According to the documentation for IRP_MJ_CREATE, the IoStatus->Information member will be set to one of: FILE_CREATED FILE_DOES_NOT_EXIST FILE_EXISTS FILE_OPENED FILE_OVERWRITTEN FILE_SUPERSEDED ...
Adding a stream to an ISO as a File
You are trying to use the IMAPI2FS type library and are running into a common problem with that library. It was authored rather poorly and is quite difficult to use directly from a .NET program. Most programs that target the api were written in C++ and use the imap2fs.h SDK...
Can't find newly-created folders in file system
To be 100% sure, add a debug line showing the full path: File saveFolder = new File("../../saved_profiles/"); if (!saveFolder.exists()) { System.out.println(saveFolder.getAbsolutePath()); ... This will show you the path without any relative segments, so from the root of your filesystem....
Random access alternative to named pipes
here is an implementation: demon.c: #include <stdio.h> #include <stdlib.h> #include <sys/mman.h> #include <unistd.h> #include <fcntl.h> #include <assert.h> #include <string.h> #include <errno.h> void map_file(const char *f) { int fd = open(f, O_CREAT|O_RDWR, 0666); if (fd < 0) { perror("fd open error\n"); exit(-1); } char *addr = (char *)mmap(NULL, 10, PROT_READ |...
What should be the size of the file in HDFS for best MapReduce job performance
hadoop,mapreduce,filesystems,hdfs
HDFS is designed to support very large files not small files. Applications that are compatible with HDFS are those that deal with large data sets. These applications write their data only once but they read it one or more times and require these reads to be satisfied at streaming speeds....
How to get the pid if i only know process name in linux using proc
If you can't use a tool like pgrep you could look in all the /proc/<pid> directories and looking at the exe link in each to find the one that points to the executable you want. Or you could look at cmdline in each if that helps instead.
Creating a Zip File System Provider in Java
You have to check the URI syntax. URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] hier-part = "//" authority path-abempty / path-absolute / path-rootless / path-empty and When authority is present, the path must either be empty or begin with a slash ("/") character. When...
find and remove all closed files that are not modified in some-time
To get the list of open files you can use lsof command. Get all the list of files from find command in a directory and remove them all. 1). Get the list of open files in a directory. lsof /folderToSearch |awk '{print $NF}'|sed -e '1 d' |sort |uniq >/tmp/lsof 2)....
Bash command-line to rename wildcard
for file in *.zip; do [[ -e $file ]] || continue # handle zero-match case without nullglob mv -- "$file" /opt/staging/"${file%-*}.zip" done ${file%-*} removes everything after the last - in the filename. Thus, we change fizz-0.1.0.zip to fizz, and then add a leading /opt/staging/ and a trailing .zip. To make...
How to find the timestamp of the latest modified file in a directory (recursively)?
I actually found a good answer from another closely related question. I've only modified the command a little to adapt it to my needs: find . -type f -printf '%[email protected]\n' | sort -n | tail -1 %[email protected] returns the modification time as a unix timestamp, which is just what I...
Can't figure out why GetFiles(…) isn't working for me
You're calling string [] folders = System.IO.Directory.GetFiles(args[0]); Have you instead tried Directory.GetDirectories? https://msdn.microsoft.com/en-us/library/c1sez4sc(v=vs.110).aspx...
Why not use a ‘block table’ for file systems (in analogy to a page table)?
memory-management,operating-system,filesystems,virtual-memory
Most filesystems do use some kind of tree-based representation to store their data in. However, there's a lot more state to store in a filesystem tree (such as directory structure, files of different lengths, etc.) than you can store in a page table. Page tables are designed to allow hardware...
Why does c++ standard still not include file system and networking? [closed]
c++,networking,filesystems,standards
Why does c++ standard still not include file system and networking? Do you have any clue, why the C++ standard committee is not even thinking about adding such an essential features in the future? No, mainly because that is not true! There are ongoing efforts to define standard support...
How to move folder from one location to another location using java
java,file,filesystems,filepath
You need to specify the name of your destination otherwise it will replace your parent folder instead (Since you are using REPLACE_EXISTING) Path path1 = FileSystems.getDefault().getPath("D:\\VFSImagecomp\\compressed"); Path path2 = FileSystems.getDefault().getPath("D:\\destinitionFile\\myNewDirectory"); If you want to keep the same name then: Path path2 = FileSystems.getDefault().getPath("D:\\destinitionFile\\compressed"); ...
Protect video from video from capturing
java,security,web,filesystems,system
I think that it is not possible to prevent user from video capturing. You can make it harder but you will never prevent user from capture screen of his computer. Even if you will control process list of computer (which i guess impossible or impossible for most users) You still...
Ext.device.filesystem.FileEntry.read() - type: “text” returns blank file
Changing the encoding to 'UTF-8' does the trick. So, working code is below: fileEntry.read({ //type: "binaryString", type: "text", encoding: "UTF-8", success: function(fileData) { console.log('--- fileData'); console.log(fileData); console.log('//--- fileData'); self.onUploadJSONSuccess(fileData, fileName, networkId, activityId, section, showWaitScreen, callback); }, failure: function(error) { if(showWaitScreen) { console.log('Failed to read file: ' + error); Ext.Msg.alert('Failed to...
How to create an event which fires after any file is modified or created or deleted in the filesystem
c#,winapi,events,windows-services,filesystems
You just need to initialize FileSystemWatcher and subscribe to relevant events. FileSystemWatcher watcher = new FileSystemWatcher(@"DirectoryPath"); watcher.Filter = "*.*";//Watch all the files watcher.EnableRaisingEvents = true; //Specifies changes to watch for in a file or folder. watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.Size; //Subscribe to the following events watcher.Changed += new FileSystemEventHandler(watcher_Changed); watcher.Created...