Use C setvbuf function to set buffer stream

Syntax

C setvbuf function has the following syntax.

Header

C setvbuf function is from header file stdio.h.

Description

C setvbuf function sets the buffer for stream to be buffer, with a size of size.

C setvbuf function returns zero on success, nonzero on failure.

Possible values of mode are _IOFBF, _IONBF, and _IOLBF.

• _IOFBF: full buffering.
• _IOLBF: line buffered.
• _IONBF: no buffering.

Example

#include <stdio.h>
/*from   w  ww.  j a  v  a  2s  . c  o  m*/
int main ()
{
  FILE *fp;

  fp=fopen ("myfile.txt","w");

  setvbuf ( fp , NULL , _IOFBF , 1024 );

  // File operations here

  fclose (fp);

  return 0;
}