Support in the lguest userpace utility for triple-Ctrl-Z. Three fast
taps of Ctrl-Z will suspend the lguest VM.
Signed-off-by: Mark Wallis <[EMAIL PROTECTED]>
--- lguest.orig 2008-01-31 12:23:53.000000000 +1100
+++ lguest.c 2008-01-31 12:23:37.000000000 +1100
@@ -689,7 +689,7 @@
tcsetattr(STDIN_FILENO, TCSANOW, &orig_term);
}
-/* We associate some data with the console for our exit hack. */
+/* We associate some data with the console for our exit and suspend
hacks. */
struct console_abort
{
/* How many times have they hit ^C? */
@@ -698,6 +698,12 @@
struct timeval start;
};
+struct console_suspend
+{
+ int count;
+ struct timeval start;
+};
+
/* This is the routine which handles console input (ie. stdin). */
static bool handle_console_input(int fd, struct device *dev)
{
@@ -706,6 +712,7 @@
unsigned int num;
struct iovec iov[LGUEST_MAX_DMA_SECTIONS];
struct console_abort *abort = dev->priv;
+ struct console_suspend *suspend = dev->priv;
/* First we get the console buffer from the Guest. The key is dev-
>mem
* which was set to 0 in setup_console(). */
@@ -757,9 +764,23 @@
}
abort->count = 0;
}
- } else
- /* Any other key resets the abort counter. */
+ } else if (len == 1 && ((char *)iov[0].iov_base)[0] == 26) {
+ if (!suspend->count++)
+ gettimeofday(&suspend->start, NULL);
+ else if (suspend->count == 3) {
+ struct timeval now;
+ gettimeofday(&now, NULL);
+ if (now.tv_sec <= suspend->start.tv_sec+1) {
+ // Suspend the lguest process
+ kill(getpid(), SIGSTOP);
+ cfmakeraw(&orig_term);
+ }
+ suspend->count = 0;
+ }
+ } else {
+ suspend->count = 0;
abort->count = 0;
+ }
/* Now, if we didn't read anything, put the input terminal back and
* return failure (meaning, don't call us again). */
_______________________________________________
Lguest mailing list
[email protected]
https://ozlabs.org/mailman/listinfo/lguest
