pSOSystem System Calls - Read

setvbuf pREPC+ System Calls
setvbuf Changes a stream’s buffering characteristics.
#include
#include
int setvbuf(
FILE *stream, /* stream pointer */
char *buf, /* I/O buffer */
int mode, /* access mode */
size_t size /* buffer size */
)
Description
Arguments
The setvbuf() function can be used to change either the buffer associated with a
stream, the size of a stream's buffer, or the method employed for buffering the
stream's data.
setvbuf() must be called after the specified stream has been opened, but prior to
reading or writing the file. If setbuf() is called after a read or write operation, it
has no effect.
pREPC+ allocates a buffer automatically if the buf parameter is NULL and a nonzero
size is specified.
stream Points to an open pREPC+ stream.
buf Points to the new buffer to be associated with the stream.
mode Defines the method employed for buffering data. The possible modes
are as follows:
_IO_FBF Input/output is fully buffered.
_IO_LBF Input/output is line buffered.
_IO_NBF Input/output is not buffered.
3-136 pSOSystem System Calls