From 6e9d047c1558f92531ea12b9e3206023ab77cf51 Mon Sep 17 00:00:00 2001 From: Aaro Koskinen Date: Sat, 4 Feb 2012 21:55:01 +0100 Subject: [PATCH] cttyhack: handle multiple consoles found in sysfs If multiple consoles are found from the sysfs file, cttyhack fails: cttyhack: can't open '/dev/tty0 ttyS0': No such file or directory In such cases take the last one as the kernel will use that one for /dev/console. Signed-off-by: Aaro Koskinen Signed-off-by: Denys Vlasenko --- shell/cttyhack.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/shell/cttyhack.c b/shell/cttyhack.c index 6ff867413..f9b59c263 100644 --- a/shell/cttyhack.c +++ b/shell/cttyhack.c @@ -123,15 +123,22 @@ int cttyhack_main(int argc UNUSED_PARAM, char **argv) * TIOCGSERIAL check, which assumes that all * serial lines follow /dev/ttySn convention - * which is not always the case. - * Therefore, we use this methos first: + * Therefore, we use this method first: */ int s = open_read_close("/sys/class/tty/console/active", console + 5, sizeof(console) - 5); if (s > 0) { - /* found active console via sysfs (Linux 2.6.38+) - * sysfs string looks like "ttyS0\n" so zap the newline: + char *last; + /* Found active console via sysfs (Linux 2.6.38+). + * It looks like "[tty0 ]ttyS0\n" so zap the newline: */ console[4 + s] = '\0'; + /* If there are multiple consoles, + * take the last one: + */ + last = strrchr(console + 5, ' '); + if (last) + overlapping_strcpy(console + 5, last + 1); break; } -- 2.25.1