03-06-2006
One of the major difference is in the buffer handling. For eg: if you use printf() , it may handle the strings ,passed to it, in its own way and flush the buffer on its own decision. Sometimes printf() does not flush the buffer and you get weird results. But if you use a sytem call , write() instead of printf(), the buffer will be flushed immediately .
John Arackal
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LEARN ABOUT DEBIAN
buffer
buffer(3) Library Functions Manual buffer(3)
NAME
buffer.h - generic read/write buffering
SYNTAX
#include <buffer.h>
buffer* buffer_0; /* like stdio's stdin */
buffer* buffer_1; /* like stdio's stdout */
buffer* buffer_2; /* like stdio's stderr */
DESCRIPTION
buffer.h provides a generic buffer interface that can be used for read and write buffering. Buffers must be initialized with buffer_init.
A buffer can only be used for reading or writing at the same time, not both.
Unlike stdio, these write buffers are not flushed automatically at program termination; you must manually call buffer_flush, buf-
fer_putsflush, buffer_putflush or buffer_putnlflush.
EXAMPLE
See buffer_init(3) for example read buffer code. Here is typical code for printing an error message on stderr:
#include <buffer.h>
buffer_puts(buffer_2,"error: got only ");
buffer_putulong(buffer_2,got);
buffer_puts(buffer_2," bytes, but expected at least ");
buffer_putulong(buffer_2,expected);
buffer_putsflush(buffer_2," bytes!");
SEE ALSO
buffer_init(3), buffer_put(3), buffer_get(3), buffer_flush(3)
buffer(3)