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