From 6d709972cdad4848908813c673b2f5fdc9e3c4c0 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Fri, 18 May 2007 09:45:36 +0000 Subject: cttyhack: new applet. --- shell/cttyhack.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 shell/cttyhack.c (limited to 'shell/cttyhack.c') diff --git a/shell/cttyhack.c b/shell/cttyhack.c new file mode 100644 index 000000000..cdd0ed1d6 --- /dev/null +++ b/shell/cttyhack.c @@ -0,0 +1,73 @@ +/* This code is adapted from busybox project + * + * Licensed under GPLv2 + */ +#include "libbb.h" + +/* From */ +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 */ +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) ATTRIBUTE_NORETURN; +int cttyhack_main(int argc, 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"); + 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--); + } + + execvp(argv[0], argv); + bb_perror_msg_and_die("cannot exec '%s'", argv[0]); +} -- cgit v1.2.3