1SETBUF(3S)                                                          SETBUF(3S)
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NAME

6       setbuf - assign buffering to a stream
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SYNOPSIS

9       #include <stdio.h>
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11       setbuf(stream, buf)
12       FILE *stream;
13       char *buf;
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DESCRIPTION

16       Setbuf  is used after a stream has been opened but before it is read or
17       written.  It causes the character array buf to be used  instead  of  an
18       automatically  allocated  buffer.  If buf is the constant pointer NULL,
19       input/output will be completely unbuffered.
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21       A manifest constant BUFSIZ tells how big an array is needed:
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23                 char buf[BUFSIZ];
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25       A buffer is normally obtained from malloc(3) upon  the  first  getc  or
26       putc(3)  on the file, except that output streams directed to terminals,
27       and the standard error stream stderr are normally not buffered.
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SEE ALSO

30       fopen(3), getc(3), putc(3), malloc(3)
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34                                                                    SETBUF(3S)