Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 3 | * Licensed under GPLv2 |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com> |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 6 | */ |
| 7 | #include "libbb.h" |
| 8 | |
| 9 | /* From <linux/vt.h> */ |
| 10 | struct vt_stat { |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 11 | unsigned short v_active; /* active vt */ |
| 12 | unsigned short v_signal; /* signal to send */ |
| 13 | unsigned short v_state; /* vt bitmask */ |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 14 | }; |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 15 | enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */ |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 16 | |
| 17 | /* From <linux/serial.h> */ |
| 18 | struct serial_struct { |
| 19 | int type; |
| 20 | int line; |
| 21 | unsigned int port; |
| 22 | int irq; |
| 23 | int flags; |
| 24 | int xmit_fifo_size; |
| 25 | int custom_divisor; |
| 26 | int baud_base; |
| 27 | unsigned short close_delay; |
| 28 | char io_type; |
| 29 | char reserved_char[1]; |
| 30 | int hub6; |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 31 | unsigned short closing_wait; /* time to wait before closing */ |
| 32 | unsigned short closing_wait2; /* no longer used... */ |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 33 | unsigned char *iomem_base; |
| 34 | unsigned short iomem_reg_shift; |
| 35 | unsigned int port_high; |
| 36 | unsigned long iomap_base; /* cookie passed into ioremap */ |
| 37 | int reserved[1]; |
| 38 | }; |
| 39 | |
Denis Vlasenko | 528a8b9 | 2007-12-22 19:57:28 +0000 | [diff] [blame] | 40 | int cttyhack_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | 85c2471 | 2008-03-17 09:04:04 +0000 | [diff] [blame] | 41 | int cttyhack_main(int argc ATTRIBUTE_UNUSED, char **argv) |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 42 | { |
| 43 | int fd; |
| 44 | char console[sizeof(int)*3 + 16]; |
| 45 | union { |
| 46 | struct vt_stat vt; |
| 47 | struct serial_struct sr; |
| 48 | char paranoia[sizeof(struct serial_struct) * 3]; |
| 49 | } u; |
| 50 | |
| 51 | if (!*++argv) { |
| 52 | bb_show_usage(); |
| 53 | } |
| 54 | |
| 55 | strcpy(console, "/dev/tty"); |
| 56 | if (ioctl(0, TIOCGSERIAL, &u.sr) == 0) { |
| 57 | /* this is a serial console */ |
| 58 | sprintf(console + 8, "S%d", u.sr.line); |
| 59 | } else if (ioctl(0, VT_GETSTATE, &u.vt) == 0) { |
| 60 | /* this is linux virtual tty */ |
| 61 | sprintf(console + 8, "S%d" + 1, u.vt.v_active); |
| 62 | } |
| 63 | |
| 64 | if (console[8]) { |
| 65 | fd = xopen(console, O_RDWR); |
| 66 | //bb_error_msg("switching to '%s'", console); |
| 67 | dup2(fd, 0); |
| 68 | dup2(fd, 1); |
| 69 | dup2(fd, 2); |
| 70 | while (fd > 2) close(fd--); |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 71 | /* Some other session may have it as ctty. Steal it from them */ |
Denis Vlasenko | d7e2e12 | 2007-12-10 08:40:29 +0000 | [diff] [blame] | 72 | ioctl(0, TIOCSCTTY, 1); |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 73 | } |
| 74 | |
Denis Vlasenko | 2afabe8 | 2007-12-10 07:06:04 +0000 | [diff] [blame] | 75 | BB_EXECVP(argv[0], argv); |
Denis Vlasenko | 6d70997 | 2007-05-18 09:45:36 +0000 | [diff] [blame] | 76 | bb_perror_msg_and_die("cannot exec '%s'", argv[0]); |
| 77 | } |