C Check Which Process Is Using a File

Lsof pathtofile lsof wont tell you about file that were opened two microseconds ago and closed one microsecond ago. Try stream fileOpenFileModeOpen FileAccessRead FileShareNone.

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The lsof command already mentioned in several answers will tell you what process has a file open at the time you run it.

. If nothing else some other process could delete or open the file after your check and before you call fopen. If you need to watch a particular file and react when it is accessed you need different tools. File descriptors are numbered per process not for the system as whole since a file descriptor is completely internal to a process.

There youll see a list of files on the server that are currently opened by other computers on your network. However finding something through exception is not the best way. Select Manage Computer Open Computer Management click Shared Folders choose Open Files.

Accept Solution Reject Solution. Lsof is available for just about every unix variant. If 0 system pidof -x PROCESS devnull A process having name PROCESS is running.

A search dialog box will open. Alternatively click the Find menu and select Find a Handle or DLL. It reads kernel memory in its search for open files and helps you list all open files.

Type in the name of the locked file or other file of interest. There you can even close the file forcefully. Else if 1 system pidof -x PROCESS devnull A process having name PROCESS is NOT running.

Res RmGetListhandle pnProcInfoNeeded pnProcInfo Nothing lpdwRebootReasons If res ERROR_MORE_DATA Then Create an array to store the process results Dim processInfo As RM_PROCESS_INFO New RM_PROCESS_INFOCIntpnProcInfoNeeded - 1 pnProcInfo pnProcInfoNeeded Get the. Still being written to or being processed by another thread or does not exist has already been processed return true. Protected virtual bool IsFileLockedFileInfo file FileStream stream null.

Fopen fails if you dont have readwriteexecute permissions on file. Int main Code snippet. The code is as.

It is not shared externally therefore system wide references would not make any sense. Testing file existence using fopen is not reliable. There is a built-in function in Windows that shows you what files on the local computer are openlocked by remote computer which has the file open through a file share.

In such case also fopen returns NULL but file exists. Thatll tell you the User who has the file open. First check if the file exists FileExists if so try to open for write within try and catch block if exception is generated then it is used by another process.

Using a slightly different approach the next method lists all running applications by first getting a list of all local processes and then checking to see if the process has a visible Main Window Title by checking to see if the caption bar contains text. A file object has a reference count and when the reference count drops to zero the file is closed. I want to find all the processes which ate using the particular file.

C C Server Side Programming Programming. The connection a file descriptor represents may involve other processes but not the descriptor itself. In this case an open file may be a regular file a directory a block special file a character special file a stream a network file and many others because in Linux everything is a file.

And thats ignoring the case that the reference is not coming from a process in the. However there are cases where the File In Use dialog doesnt show the name of the process that has a lock on the file youre trying to delete. We can use the lsof command to know if someone is using a file and if they are who.

On the server right-click on My Computer then select Manage expand Shared Folders and click on Open Files. There is no try The only reliable way to find out if fopen will work is to do the fopen. This is heavily operating system specific and might be useless So read first a good textbook on operating systems.

The best way to check if a file exists using standard CC. In the above syntax the file is a data structure which is defined in the standard library. Partial names are usually sufficient.

When you attempt to delete a file or folder which is in use by a process the File In Use dialog appears showing the name of the program that has locked the file. On Linux specifically you might use inotify7 facilities or proc pseudo-file system see proc5 or perhaps lsof8They work only for local file systems not remote ones like NFS. Here is an example.

If the processes are GUI based then my code will list all the processes which are using the file but if processes are running in background which has no GUI then those processes are not listing. Do or do not. I need to check if a file is currently opened by another process.

Fopen is a standard function which is used to open a file. Fp fopen file_name mode. Classically there was no way to find out which process has a file open.

If it returns NULL then file does not exists otherwise exists on disk. But theres nobody keeping track of which processes own how many references. Catch IOException the file is unavailable because it is.

Continue processing further. Enter the keyboard shortcut CtrlF. Youll need to then click on Sessions to see what computers that user.

If the file is not present on the system then it is created and then opened. Is there any way to find all the processes with or without GUI. The only way to check if a file exist is to try to open the file for reading or writing.

Identify which handle or DLL is using a file. Finally if stream null. You can use fopen function to open given file in read mode.

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