Home/ Questions/Q 783003
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-14T20:28:36+00:00

In C++, there is an std::fwrite() which writes a buffer to a file on

  • 0

In C++, there is an std::fwrite() which writes a buffer to a file on disk.

Can you please tell me if there is any buffer inside that fwrite implementation?

i.e. if I call fwrite() multiple times (say 10 times), does it actually invoke file I/O 10 different times?

I am asking this for Ubuntu 10.04 environment.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Yes, it is buffered. The size of the buffer is defined by BUFSIZ. (Thanks @ladenedge.) Ten sufficiently large operations will result in ten system calls.

    You are also allowed to set your own buffer using std::setbuf and std::setvbuf.

    The functions in cstdio are inherited from C. The preferred interface in C++ is fstream and filebuf.

    • 0