| [1765] | 1 | /* This code is adapted from busybox project
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| 2 | *
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| 3 | * Licensed under GPLv2
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| 4 | */
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| 5 | #include "libbb.h"
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| 6 |
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| 7 | /* From <linux/vt.h> */
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| 8 | struct vt_stat {
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| 9 | unsigned short v_active; /* active vt */
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| 10 | unsigned short v_signal; /* signal to send */
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| 11 | unsigned short v_state; /* vt bitmask */
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| 12 | };
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| 13 | enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
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| 14 |
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| 15 | /* From <linux/serial.h> */
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| 16 | struct serial_struct {
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| 17 | int type;
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| 18 | int line;
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| 19 | unsigned int port;
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| 20 | int irq;
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| 21 | int flags;
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| 22 | int xmit_fifo_size;
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| 23 | int custom_divisor;
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| 24 | int baud_base;
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| 25 | unsigned short close_delay;
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| 26 | char io_type;
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| 27 | char reserved_char[1];
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| 28 | int hub6;
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| 29 | unsigned short closing_wait; /* time to wait before closing */
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| 30 | unsigned short closing_wait2; /* no longer used... */
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| 31 | unsigned char *iomem_base;
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| 32 | unsigned short iomem_reg_shift;
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| 33 | unsigned int port_high;
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| 34 | unsigned long iomap_base; /* cookie passed into ioremap */
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| 35 | int reserved[1];
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| 36 | };
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| 37 |
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| 38 | int cttyhack_main(int argc, char **argv) ATTRIBUTE_NORETURN;
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| 39 | int cttyhack_main(int argc, char **argv)
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| 40 | {
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| 41 | int fd;
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| 42 | char console[sizeof(int)*3 + 16];
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| 43 | union {
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| 44 | struct vt_stat vt;
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| 45 | struct serial_struct sr;
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| 46 | char paranoia[sizeof(struct serial_struct) * 3];
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| 47 | } u;
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| 48 |
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| 49 | if (!*++argv) {
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| 50 | bb_show_usage();
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| 51 | }
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| 52 |
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| 53 | strcpy(console, "/dev/tty");
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| 54 | if (ioctl(0, TIOCGSERIAL, &u.sr) == 0) {
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| 55 | /* this is a serial console */
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| 56 | sprintf(console + 8, "S%d", u.sr.line);
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| 57 | } else if (ioctl(0, VT_GETSTATE, &u.vt) == 0) {
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| 58 | /* this is linux virtual tty */
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| 59 | sprintf(console + 8, "S%d" + 1, u.vt.v_active);
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| 60 | }
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| 61 |
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| 62 | if (console[8]) {
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| 63 | fd = xopen(console, O_RDWR);
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| 64 | //bb_error_msg("switching to '%s'", console);
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| 65 | dup2(fd, 0);
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| 66 | dup2(fd, 1);
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| 67 | dup2(fd, 2);
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| 68 | while (fd > 2) close(fd--);
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| 69 | }
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| 70 |
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| 71 | execvp(argv[0], argv);
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| 72 | bb_perror_msg_and_die("cannot exec '%s'", argv[0]);
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| 73 | }
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