SETBUF(3S) SETBUF(3S)
NAME
setbuf - assign buffering to a stream
SYNOPSIS
#include <stdio.h>
setbuf(stream, buf)
FILE *stream;
char buf[BUFSIZ];
DESCRIPTION
Setbuf is used after a stream has been opened but before it
is read or written. It causes the character array buf to be
used instead of an automatically allocated buffer. If buf
is the constant pointer `NULL', input/output will be com-
pletely unbuffered.
A buffer is normally obtained from malloc(3) upon the first
getc(3) or putc on the file. Initially, the standard stream
stderr is unbuffered, and the standard stream stdout is
flushed automatically whenever new data is read by getc. The
latter magic may be dissolved by a call to setbuf.
SEE ALSO
stdio(3), malloc(3)