TIOCGSIZE, TIOCGWINSZ
QNX SDP8.0Devctl and Ioctl CommandsDeveloper
Get the size of a character device
Synopsis:
#include <sys/ioctl.h>
#define TIOCGSIZE TIOCGWINSZ
#define TIOCGWINSZ _IOR('t', 104, struct winsize)
Arguments to ioctl():
Argument | Value |
---|---|
fd | A file descriptor that you obtained by opening the device |
request | TIOCGWINSZ |
Additional argument | A pointer to a struct winsize |
Description:
This command gets the size of a character device (also known as the window size). It's also implemented as the DCMD_CHR_GETSIZE devctl() command.
Note:
This command is for internal use, and you shouldn't use it directly.
Instead use the
tcgetsize()
cover function.
Input:
None.
Output:
The winsize structure is defined in <sys/ioctl.h> as follows:
struct winsize {
unsigned short ws_row;
unsigned short ws_col;
unsigned short ws_xpixel;
unsigned short ws_ypixel;
};
See also:
DCMD_CHR_GETSIZE, TIOCSSIZE, TIOCSWINSZ
ioctl() in the QNX OS C Library Reference
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