Low level file operations

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Actually you have like file. Improve this answer. Jack Jack k 28 28 gold badges silver badges bronze badges. Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

Related File Descriptors When you perform any read or write operations you need to open a file. You can create a new file to write to it, or you can use an existing file by discarding its previous contents. You need to specific permissions to be able to perform read or write operations. The open function The open function can be used to open an existing file or to create a new file. This function returns a file descriptor for the file name passed to it.

If the file opens sucessfuly then the file position is set to zero position, signifying the beginning of the file. The read function reads the number of bytes that are specified in the parameter size from the file with the descriptor filedes.

The results are stored in the buffer. The function returns the number of bytes actually read. A value of zero indicates end of file except if the value of the size argument is also zero. In the case of an error, the read function returns In this case, the result will be a file that will contain zeroes up to the specified position after the end of the file.

Collectives on Stack Overflow. Learn more. Asked 7 years, 11 months ago. Active 7 years, 7 months ago. Viewed times. Improve this question. Community Bot 1 1 1 silver badge. Deniz Beker Deniz Beker 1, 1 1 gold badge 16 16 silver badges 22 22 bronze badges. What mode are you using to open the output file write, append, etc. I am using write mode. What is it that you want to achieve?

Append data to the file so that either the file remains as it was or is securely updated? I want to be sure that case 3 never happens. The other cases can be detected and can be taken care of easily. If so, how about wrapping your data with some matching meta-data at the beginning and end of the file. If the meta-data didn't match, you know you hit case 3.

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