Can you open the same file twice?

Can you open the same file twice?

1 Answer. A file manager is responsible for invoking applications to open a file. It has no control over what the application does with the file, and in particular whether the application will open a new window if you open the same file twice.

What happens if you open a file twice?

If you think about it, you’ll realize that several programs can read a given file at the same time. In fact, each opening of a file creates a separate file position. Thus, if you open a file twice even in the same program, you get two streams or descriptors with independent file positions.

Do file descriptors close automatically?

2 Answers. Yes, the file will be automatically closed when the process terminates, regardless of the reason for the process termination.

What is the use of get () in file?

The get() function is member of ifstream class. It is used to read character form the file.

Can you open the same file twice C++?

There’s no magic to it. If you need to read a file twice, then just do the same the second time as you did the first time. As mikeyboy said, except if you want to read it twice without closing it you can call fseek() to move the read pointer back to the start of the file.

Can we open a file twice in C?

In fact, each opening of a file creates a separate file position. Thus, if you open a file twice even in the same program, you get two streams or descriptors with independent file positions.

What happens if you don’t close a python file?

Python doesn’t flush the buffer—that is, write data to the file—until it’s sure you’re done writing, and one way to do this is to close the file. If you write to a file without closing, the data won’t make it to the target file.

What do the numbers mean in a file descriptor?

NUMBER – Represent the actual file descriptor. The character after the number i.e “1u”, represents the mode in which the file is opened. r for read, w for write, u for read and write. TYPE specifies the type of the file.

What’s the difference between a file and a descriptor?

Every File has an associated number called File Descriptor (FD). Your screen also has a File Descriptor. When a program is executed the output is sent to File Descriptor of the screen, and you see program output on your monitor. If the output is sent to File Descriptor of the printer, the program output would have been printed.

How are file descriptors referred to in the kernel?

File descriptors To Kernel all open files are referred to by file descriptors. A file descriptor is a non – negative integer. When we open an existing or create a new file, the kernel returns a file descriptor to a process.

Where do you find a file descriptor in Unix?

Therefore, when you use open () or socket () (system calls to interface to the kernel), you are given a file descriptor, which is an integer (it is actually an index into the processes u structure – but that is not important).