A/UX® Programmer's Reference Sections

setbuf(3S) setbuf(3S)
RETURN VALUE
If an illegal value for type or size is provided, setvbuf returns a
nonzero value. Otherwise, the value returned will be zero.
SEE ALSO
fopen(3S), getc(3S), intro(3), malloc(3C), putc(3S).
NOTES
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.
setbuf allows assignment of a new I/O buffer after the stream
has been read (written), and if unflushed data remains in the original
buffer. This could lead to a loss of data error.
February, 1990
Revision C
2