/* vi: set sw=4 ts=4: */ /* * Licensed under GPLv2 * * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com> */ #include "libbb.h" /* From <linux/vt.h> */ struct vt_stat { unsigned short v_active; /* active vt */ unsigned short v_signal; /* signal to send */ unsigned short v_state; /* vt bitmask */ }; enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */ /* From <linux/serial.h> */ struct serial_struct { int type; int line; unsigned int port; int irq; int flags; int xmit_fifo_size; int custom_divisor; int baud_base; unsigned short close_delay; char io_type; char reserved_char[1]; int hub6; unsigned short closing_wait; /* time to wait before closing */ unsigned short closing_wait2; /* no longer used... */ unsigned char *iomem_base; unsigned short iomem_reg_shift; unsigned int port_high; unsigned long iomap_base; /* cookie passed into ioremap */ int reserved[1]; }; int cttyhack_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int cttyhack_main(int argc UNUSED_PARAM, char **argv) { int fd; char console[sizeof(int)*3 + 16]; union { struct vt_stat vt; struct serial_struct sr; char paranoia[sizeof(struct serial_struct) * 3]; } u; if (!*++argv) { bb_show_usage(); } strcpy(console, "/dev/tty"); if (ioctl(0, TIOCGSERIAL, &u.sr) == 0) { /* this is a serial console */ sprintf(console + 8, "S%d", u.sr.line); } else if (ioctl(0, VT_GETSTATE, &u.vt) == 0) { /* this is linux virtual tty */ sprintf(console + 8, "S%d" + 1, u.vt.v_active); } if (console[8]) { fd = xopen(console, O_RDWR); //bb_error_msg("switching to '%s'", console); dup2(fd, 0); dup2(fd, 1); dup2(fd, 2); while (fd > 2) close(fd--); /* Some other session may have it as ctty. Steal it from them */ ioctl(0, TIOCSCTTY, 1); } BB_EXECVP(argv[0], argv); bb_perror_msg_and_die("can't execute '%s'", argv[0]); }