mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-13 23:08:53 +00:00
5055a9f989
function old new delta cttyhack_main 244 269 +25 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/* 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");
|
|
fd = open(console, O_RDWR);
|
|
if (fd >= 0) {
|
|
/* We already have ctty, nothing to do */
|
|
close(fd);
|
|
} else {
|
|
/* We don't have ctty (or don't have "/dev/tty" node...) */
|
|
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]);
|
|
}
|