diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-05-18 13:45:36 +0400 |
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committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-05-18 13:45:36 +0400 |
commit | 6d709972cdad4848908813c673b2f5fdc9e3c4c0 (patch) | |
tree | 77c14cf3279dd5e2d2536477ee6eff4884cd3bcc /shell/cttyhack.c | |
parent | 4500c58a0766b9cc86dd8ddd25094593a8977197 (diff) |
cttyhack: new applet.
Diffstat (limited to 'shell/cttyhack.c')
-rw-r--r-- | shell/cttyhack.c | 73 |
1 files changed, 73 insertions, 0 deletions
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 <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) 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]); +} |