116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/* openvt.c - Run a program on a new VT
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*
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* Copyright 2008 David Anders <danders@amltd.com>
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* Copyright 2014 Vivek Kumar Bhagat <vivek.bhagat89@gmail.com>
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*
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* No Standard
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USE_OPENVT(NEWTOY(openvt, "^<1c#<1>63sw", TOYFLAG_BIN|TOYFLAG_NEEDROOT))
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USE_CHVT(NEWTOY(chvt, "<1", TOYFLAG_USR|TOYFLAG_BIN))
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USE_DEALLOCVT(NEWTOY(deallocvt, ">1", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_NEEDROOT))
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config OPENVT
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bool "openvt"
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default y
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help
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usage: openvt [-c NUM] [-sw] COMMAND...
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Run COMMAND on a new virtual terminal.
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-c NUM Use VT NUM
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-s Switch to the new VT
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-w Wait for command to exit (with -s, deallocates VT on exit)
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config CHVT
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bool "chvt"
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default y
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help
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usage: chvt NUM
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Change to virtual terminal number NUM. (This only works in text mode.)
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Virtual terminals are the Linux VGA text mode (or framebuffer) displays,
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switched between via alt-F1, alt-F2, etc. Use ctrl-alt-F1 to switch
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from X11 to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
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config DEALLOCVT
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bool "deallocvt"
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default y
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help
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usage: deallocvt [NUM]
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Deallocate unused virtual terminals, either a specific /dev/ttyNUM, or all.
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*/
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#define FOR_openvt
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#include "toys.h"
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#include <linux/vt.h>
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#include <linux/kd.h>
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GLOBALS(
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long c;
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)
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static int open_console(void)
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{
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char arg = 0, *console_name[] = {"/dev/tty", "/dev/tty0", "/dev/console"};
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int i, fd;
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for (i = 0; i < ARRAY_LEN(console_name); i++) {
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if (0>(fd = open(console_name[i], O_RDWR))) continue;
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if (!ioctl(fd, KDGKBTYPE, &arg)) return fd;
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close(fd);
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}
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for (fd = 0; fd < 3; fd++) if (!ioctl(fd, KDGKBTYPE, &arg)) return fd;
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error_exit("can't open console");
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}
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static int activate(int fd, int cc)
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{
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return ioctl(fd, VT_ACTIVATE, cc) || ioctl(fd, VT_WAITACTIVE, cc);
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}
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void openvt_main(void)
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{
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struct vt_stat vstate;
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int fd, cc = (int)TT.c;
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pid_t pid;
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// find current console
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if (-1 == (ioctl(fd = open_console(), VT_GETSTATE, &vstate)) ||
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(!cc && 0>=(cc = xioctl(fd, VT_OPENQRY, &fd))))
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perror_exit("can't find open VT");
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sprintf(toybuf, "/dev/tty%d", cc);
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if (!(pid = XVFORK())) {
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close(0); //new vt becomes stdin
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dup2(dup2(xopen_stdio(toybuf, O_RDWR), 1), 2);
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if (FLAG(s)) activate(0, cc);
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setsid();
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ioctl(0, TIOCSCTTY, 0);
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if (fd>2) close(fd);
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xexec(toys.optargs);
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}
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if (FLAG(w)) {
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while (-1 == waitpid(pid, NULL, 0) && errno == EINTR) errno = 0;
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if (FLAG(s)) {
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activate(fd, vstate.v_active);
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dprintf(2, "%d\n", ioctl(fd, VT_DISALLOCATE, cc));
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}
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}
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}
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void chvt_main(void)
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{
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if (activate(open_console(), atoi(*toys.optargs)))
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perror_exit_raw(*toys.optargs);
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}
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void deallocvt_main(void)
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{
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int fd = open_console(), vt_num = 0; // 0 = all
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if (*toys.optargs) vt_num = atolx_range(*toys.optargs, 1, 63);
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if (-1 == ioctl(fd, VT_DISALLOCATE, vt_num)) perror_exit("%d", vt_num);
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}
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