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  • Understanding the need for fflush() and problems associated with it
    fflush() empties the buffers related to the stream if you e g let a user input some data in a very shot timespan (milliseconds) and write some stuff into a file, the writing and reading buffers may have some "reststuff" remaining in themselves you call fflush() then to empty all the buffers and force standard outputs to be sure the next
  • Difference between fflush and fsync - Stack Overflow
    fflush() and fsync() can be used to try and ensure data is written to the storage media (but it is not always be possible): first use fflush(fp) on the output stream (fp being a FILE * obtained from fopen or one of the standard streams stdout or stderr) to write the contents of the buffer associated with the stream to the OS
  • c - Using fflush(stdin) - Stack Overflow
    For input streams, fflush() discards any buffered data that has been fetched from the underlying file, but has not been consumed by the application In 2021, the quote changes to: For input streams, fflush() discards any buffered data that has been fetched from the underlying file, but has not been consumed by the application The open status
  • fflush (stdout) in c - Stack Overflow
    I'd generally agree with other posters that fflush() is a reliable way to know what you actually wrote to the file However, if you have lost track of what parts of your code might be writing to a stream, then it can occasionally be useful to watch the stream in action and catch it changing
  • What is fflush exactly and what does it do? - Stack Overflow
    Fflush empties the buffer and forces all changes to be written to the file This is particularly useful when you are done writing to the file, since it is good practice to flush the buffer before closing the file (thereby making sure that all data has been successfully written to the file) This goes for other types of filestreams too
  • c - the use of fflush (FILE* stream) - Stack Overflow
    fflush is needed when you need to control when output written to a stdio FILE actually becomes visible, since stdio normally buffers output and writes a large chunk as a unit For basic C programs not using any interfaces with the operating system outside of the C standard library, the main only time you need this kind of control is when the
  • what is the different of using fflush(stdout) and not using it
    @pmg After fflush(), all the write data hold by the C-Library was written to the OS So you description of computer internals in combination with the text above is misleading It is the purpose of fflush() that the data in the C-Library is given to the underlying system (most likely the OS) –
  • c - Fflush on a file - Stack Overflow
    This can be fflush(), but it will also synchronize if you use fseek() And if you want to read what you just wrote, you have to use fseek() to move back to the place where you started writing; that will synchronize without the need for fflush() But fflush() is really needed if some other process tries to read the file while this process is





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