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