SETBUF(P) POSIX Programmer's Manual SETBUF(P)
setbuf - assign buffering to a stream
void setbuf(FILE *restrict stream, char *restrict buf);
Except that it returns no value, the function call:
shall be equivalent to:
setvbuf(stream, buf, _IOFBF, BUFSIZ)
if buf is not a null pointer, or to:
setvbuf(stream, buf, _IONBF, BUFSIZ)
if buf is a null pointer.
The setbuf() function shall not return a value.
No errors are defined.
The following sections are informative.
A common source of error is allocating buffer space as an "automatic" variable in a code
block, and then failing to close the stream in the same block.
With setbuf(), allocating a buffer of BUFSIZ bytes does not necessarily imply that all of
BUFSIZ bytes are used for the buffer area.
fopen() , setvbuf() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 SETBUF(P)