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cttyhack: serial console detection is Linux-specific

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Signed-off-by: Jeremie Koenig <jk@jk.fr.eu.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Jeremie Koenig 2010-07-30 06:21:21 +02:00 committed by Denys Vlasenko
parent 85a359afab
commit 430ba79c39
1 changed files with 12 additions and 3 deletions
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15
shell/cttyhack.c
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@ -13,7 +13,6 @@
//config:config CTTYHACK
//config: bool "cttyhack"
//config: default y
//config: depends on PLATFORM_LINUX
//config: help
//config: One common problem reported on the mailing list is "can't access tty;
//config: job control turned off" error message which typically appears when
@ -59,6 +58,10 @@
//usage: "\nStarting interactive shell from boot shell script:"
//usage: "\n setsid cttyhack sh"
#if !defined(__linux__) && !defined(TIOCGSERIAL)
# warning cttyhack will not be able to detect a controlling tty on this system
#endif
/* From <linux/vt.h> */
struct vt_stat {
unsigned short v_active; /* active vt */
@ -112,13 +115,19 @@ int cttyhack_main(int argc UNUSED_PARAM, char **argv)
close(fd);
} else {
/* We don't have ctty (or don't have "/dev/tty" node...) */
if (ioctl(0, TIOCGSERIAL, &u.sr) == 0) {
if (0) {}
#ifdef TIOCGSERIAL
else 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) {
}
#endif
#ifdef __linux__
else if (ioctl(0, VT_GETSTATE, &u.vt) == 0) {
/* this is linux virtual tty */
sprintf(console + 8, "S%d" + 1, u.vt.v_active);
}
#endif
if (console[8]) {
fd = xopen(console, O_RDWR);
//bb_error_msg("switching to '%s'", console);