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SETBUF(3) Linux Programmer's Manual SETBUF(3)


setbuf, setbuffer, setlinebuf, setvbuf - stream buffering operations


#include <stdio.h>

void setbuf(FILE *stream, char *buf);
void setbuffer(FILE *stream, char *buf, size_tsize);
void setlinebuf(FILE *stream);
int setvbuf(FILE *stream, char *buf, int mode , size_t size);


The three types of buffering available are unbuffered, block buffered, and line buffered. When an output stream is unbuffered, information appears on the destination file or terminal as soon as written; when it is block buffered many characters are saved up and written as a block; when it is line buffered characters are saved up until a newline is output or input is read from any stream attached to a terminal device (typically stdin). The function fflush(3) may be used to force the block out early. (See fclose(3).) Normally all files are block buffered. When the first I/O operation occurs on a file, malloc(3) is called, and a buffer is obtained. If a stream refers to a terminal (as stdout normally does) it is line buffered. The standard error stream stderr is always unbuffered by default.

The setvbuf function may be used at any time on any open stream to change its buffer. The mode parameter must be one of the following three macros:

line buffered
fully buffered

Except for unbuffered files, the buf argument should point to a buffer at least size bytes long; this buffer will be used instead of the current buffer. If the argument buf is NULL, only the mode is affected; a new buffer will be allocated on the next read or write operation. The setvbuf function may be used at any time, but can only change the mode of a stream when it is not ``active'': that is, before any I/O, or immediately after a call to fflush.

The other three calls are, in effect, simply aliases for calls to setvbuf. The setbuf function is exactly equivalent to the call

setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);

The setbuffer function is the same, except that the size of the buffer is up to the caller, rather than being determined by the default BUFSIZ. The setlinebuf function is exactly equivalent to the call:

setvbuf(stream, (char *)NULL, _IOLBF, 0);


The setbuf and setvbuf functions conform to ANSI X3.159-1989 (``ANSI C'').


The setbuffer and setlinebuf functions are not portable to versions of BSD before 4.2BSD, and may not be available under Linux. On 4.2BSD and 4.3BSD systems, setbuf always uses a suboptimal buffer size and should be avoided.

You must make sure that both buf and the space it points to still exist by the time stream is closed, which also happens at program termination.

For example, the following is illegal:

#include <stdio.h>
int main()

char buf[BUFSIZ];
setbuf(stdin, buf);
printf("Hello, world!\n");
return 0; }


fclose(3), fflush(3), fopen(3), fread(3), malloc(3), printf(3), puts(3)

29 November 1993 BSD MANPAGE