TIOCGSIZE, TIOCGWINSZ

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; 
};