setvbuf()

This is a File I/O function. It is not implemented in the Compiler.

  #include <stdio.h>

  

  void setvbuf(FILE *f,

  

               char *buf,

  

               int mode,

  

               size_t size);

  

setvbuf() is used to specify how a file is buffered. mode determines how the file is buffered.

To make a file unbuffered, call setvbuf() with mode _IONBF; the other arguments ( buf and size) are ignored.

In all other modes, the file uses buffer buf of size size. If buf is NULL, the function allocates a buffer of size size itself.

fflush() and

setbuf()