view toys/pending/deallocvt.c @ 1214:a31d747b0017 draft

Please find the patches attached herewith for adding 3 new commands - 1. freeramdisk - If we unmount or detach the RAM disk based file system the Linux Kernel will not free the allocated memory associated with the RAM device. This can be useful if one wants to mount this device again: All data will be preserved. If we need to free the memory back to the Kernel, one can use the command: "toybox freeramdisk <RAM device>". 2. openvt - Successfully opens a new virtual terminal as mentioned with -c option otherwise search and open next available VT. with -s option it switches to new VT with -s -w option, it switch back successfully to originating VT. 3. deallocvt - Deallocate specified virtual teminal. if no virtual terminal is specified, it deallocates all unused VT.
author Vivek Bhagat <>
date Sun, 09 Mar 2014 14:27:11 -0500
children 3c855d5a75be
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/* deallocvt.c - Deallocate virtual terminal(s)
 * Copyright 2014 Vivek Kumar Bhagat <>
 * No Standard.


  bool "deallocvt"
	depends on OPENVT
  default n
		usage: deallocvt [N]

		Deallocate unused virtual terminal /dev/ttyN
		default value of N is 0, deallocate all unused consoles

#include "toys.h"
#include <linux/vt.h>

void deallocvt_main(void)
	int fd;

	// 0 : deallocate all unused consoles
	int vt_num = 0;

	if (toys.optargs[0])
		vt_num = atolx_range(toys.optargs[0], 1, 63);

	fd = find_console_fd();
	if (fd < 0)	error_exit("can't open console");

	xioctl(fd, VT_DISALLOCATE, (void *)(ptrdiff_t)vt_num);