DCMD_CHR_GETSIZE

Get the size of a character device

Synopsis:

#include <sys/dcmd_chr.h>

#define DCMD_CHR_GETSIZE   __DIOF(_CMD_IOCTL_TTY, 104, struct winsize)    /* TIOCGWINSZ */

Arguments to devctl():

Argument	Value
`filedes`	A file descriptor that you obtained by opening the device.
`dcmd`	DCMD_CHR_GETSIZE
`dev_data_ptr`	A pointer to a struct winsize (see below)
`n_bytes`	`sizeof(struct winsize)`
`dev_info_ptr`	NULL

Description:

This command gets the size of a character device. It's also implemented as the TIOCGSIZE or TIOCGWINSZ ioctl() 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; 
};