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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2008-12-16 00:09:38 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-21 14:21:15 +1100
commit368c1e3249afe0e59097e7df664435ae55fb9f8d (patch)
treebdcfedb358238fa0775b933f7a2393eb3c552a36 /drivers/char/hvc_console.c
parent532774ec7fa396da20ca724c0cf83d93ee76622f (diff)
hvc_console: Escape magic sysrq key
The ctrl-o (^O) is a common control key used by several applications, such as vim, but hvc_console uses ^O as the magic-sysrq key. This commit allows users to send ^O to applications by pressing ^O twice in succession. To implement this, this commit introduces a check if ^O is pressed again if the sysrq_pressed variable is already set. In this case, clear sysrq_pressed state and flip the ^O character to the tty. (The old behavior has always set "sysrq_pressed" if ^O has been entered, and it has not flipped the ^O character to the tty.) Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/char/hvc_console.c')
-rw-r--r--drivers/char/hvc_console.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 74ecb5b2968..fb57f67bb42 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -642,8 +642,11 @@ int hvc_poll(struct hvc_struct *hp)
/* Handle the SysRq Hack */
/* XXX should support a sequence */
if (buf[i] == '\x0f') { /* ^O */
- sysrq_pressed = 1;
- continue;
+ /* if ^O is pressed again, reset
+ * sysrq_pressed and flip ^O char */
+ sysrq_pressed = !sysrq_pressed;
+ if (sysrq_pressed)
+ continue;
} else if (sysrq_pressed) {
handle_sysrq(buf[i], tty);
sysrq_pressed = 0;