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    Annotation of /trunk/mkinitrd-magellan/busybox/shell/cttyhack.c

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    Revision 1123 - (hide annotations) (download)
    Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 2055 byte(s) 
    -updated to busybox-1.17.1
    1 niro 816 /* vi: set sw=4 ts=4: */
    2     /*
    3     * Licensed under GPLv2
    4     *
    5     * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
    6     */
    7     #include "libbb.h"
    8    
    9     /* From <linux/vt.h> */
    10     struct vt_stat {
    11     unsigned short v_active; /* active vt */
    12     unsigned short v_signal; /* signal to send */
    13     unsigned short v_state; /* vt bitmask */
    14     };
    15     enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
    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;
    31     unsigned short closing_wait; /* time to wait before closing */
    32     unsigned short closing_wait2; /* no longer used... */
    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    
    40     int cttyhack_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    41     int cttyhack_main(int argc UNUSED_PARAM, char **argv)
    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 niro 1123 fd = open(console, O_RDWR);
    57     if (fd >= 0) {
    58     /* We already have ctty, nothing to do */
    59     close(fd);
    60     } else {
    61     /* We don't have ctty (or don't have "/dev/tty" node...) */
    62     if (ioctl(0, TIOCGSERIAL, &u.sr) == 0) {
    63     /* this is a serial console */
    64     sprintf(console + 8, "S%d", u.sr.line);
    65     } else if (ioctl(0, VT_GETSTATE, &u.vt) == 0) {
    66     /* this is linux virtual tty */
    67     sprintf(console + 8, "S%d" + 1, u.vt.v_active);
    68     }
    69     if (console[8]) {
    70     fd = xopen(console, O_RDWR);
    71     //bb_error_msg("switching to '%s'", console);
    72     dup2(fd, 0);
    73     dup2(fd, 1);
    74     dup2(fd, 2);
    75     while (fd > 2)
    76     close(fd--);
    77     /* Some other session may have it as ctty,
    78     * steal it from them:
    79     */
    80     ioctl(0, TIOCSCTTY, 1);
    81     }
    82 niro 816 }
    83    
    84 niro 1123 BB_EXECVP_or_die(argv);
    85 niro 816 }