ioctl_vt - ioctls for console terminal and virtual consoles

The following Linux-specific ioctl(2) operations are supported for console terminals and virtual consoles. VT_OPENQRY Returns the first available (non-opened) console. argp points to an int which is set to the number of the vt (1 <= *argp <= MAX_NR_CONSOLES). VT_GETMODE Get mode of active vt. argp points to a struct vt_mode { char mode; /* vt mode */ char waitv; /* if set, hang on writes if not active */ short relsig; /* signal to raise on release op */ short acqsig; /* signal to raise on acquisition */ short frsig; /* unused (set to 0) */ }; which is set to the mode of the active vt. mode is set to one of these values: VT_AUTO auto vt switching VT_PROCESS process controls switching VT_ACKACQ acknowledge switch VT_SETMODE Set mode of active vt. argp points to a structvt_mode. VT_GETSTATE Get global vt state info. argp points to a struct vt_stat { unsigned short v_active; /* active vt */ unsigned short v_signal; /* signal to send */ unsigned short v_state; /* vt bit mask */ }; For each vt in use, the corresponding bit in the v_state member is set. (Linux 1.0 through Linux 1.1.92.) VT_RELDISP Release a display. VT_ACTIVATE Switch to vt argp (1 <= argp <= MAX_NR_CONSOLES). VT_WAITACTIVE Wait until vt argp has been activated. VT_DISALLOCATE Deallocate the memory associated with vt argp. (Since Linux 1.1.54.) VT_RESIZE Set the kernel's idea of screensize. argp points to a struct vt_sizes { unsigned short v_rows; /* # rows */ unsigned short v_cols; /* # columns */ unsigned short v_scrollsize; /* no longer used */ }; Note that this does not change the videomode. See resizecons(8). (Since Linux 1.1.54.) VT_RESIZEX Set the kernel's idea of various screen parameters. argp points to a struct vt_consize { unsigned short v_rows; /* number of rows */ unsigned short v_cols; /* number of columns */ unsigned short v_vlin; /* number of pixel rows on screen */ unsigned short v_clin; /* number of pixel rows per character */ unsigned short v_vcol; /* number of pixel columns on screen */ unsigned short v_ccol; /* number of pixel columns per character */ }; Any parameter may be set to zero, indicating "no change", but if multiple parameters are set, they must be self-consistent. Note that this does not change the videomode. See resizecons(8). (Since Linux 1.3.3.)

EINVALargp is invalid.

ioctl_vt - ioctls for console terminal and virtual consoles

On success, 0 is returned (except where indicated). On failure, -1 is returned, and errno is set to indicate the error.

ioctl(2), ioctl_console(2) Linux man-pages 6.9.1 2024-06-13 ioctl_vt(2)

Linux.

#include<linux/vt.h> /* Definition of VT_* constants */ #include<sys/ioctl.h>intioctl(intfd,unsignedlongop,void*argp);