Moxa Technologies INTELLIO C218 - Manual (Page 61)

Serial Programming Tools
Intellio C218Turbo /PCI User's Manual 4-7
Syntax for SCO UNIX/XENIX
#define MIBUFED 0x401
int count; /* number of bytes queued in the buffer */
ioctl(moxa_fd, MIBUFED, &count);
Syntax for UNIX SVR4
#include <sys/stropts.h>
#include <sys/sysmacros.h>
#define MIBUFED 0x401
struct strioctl ioc;
int count; /* number of bytes queued in the buffer */
ioc.ic_cmd = MIBUFED;
ioc.ic_timout = 0;
ioc.ic_len = sizeof(int);
ioc.ic_dp = (char *)&count;
ioctl(moxa_fd, I_STR, &ioc);
Note: Due to the characteristics of STREAMS driver, the returned count of
bytes buffered only reflect the data buffered on MOXA board, not
including the data buffered in STREAMS queue. In this case, the count
is for reference only. For example, returned count may always be zero,
but there still are data buffered in STREAMS queue.
2. MOBUFED
This function let you know the byte count queued in output buffer when this
function is issued.
Syntax for SCO UNIX/XENIX
#define MOBUFED 0x402
int count; /* number of bytes queued in the output buffer */
ioctl(moxa_fd, MOBUFED, &count);
Syntax for UNIX SVR4
#include <sys/stropts.h>
#include <sys/sysmacros.h>
#define MOBUFED 0x402
struct strioctl ioc;
int
count; /* number of bytes queued in the output buffer */