On Fri, Oct 06, 2006 at 07:37:23PM +0200, Stefan Seyfried wrote:
> On Fri, Oct 06, 2006 at 03:54:08PM +0200, Stefan Seyfried wrote:
> > Hi,
> >
> > i just had an idea :-)
>
> ok, so how about this:
it does not work.
> Index: s2ram.c
> ===================================================================
> RCS file: /cvsroot/suspend/suspend/s2ram.c,v
> retrieving revision 1.45
> diff -u -p -r1.45 s2ram.c
> --- s2ram.c 20 Sep 2006 16:23:51 -0000 1.45
> +++ s2ram.c 6 Oct 2006 17:32:56 -0000
> @@ -10,11 +10,15 @@
> #include <getopt.h>
> #include <errno.h>
> #include <string.h>
> +#include <sys/ioctl.h>
> +#include <syscall.h>
> +#include <unistd.h>
>
> #define S2RAM
> #include "vbetool/vbetool.h"
> #include "vt.h"
> #include "s2ram.h"
> +#include "swsusp.h"
>
> static void *vbe_buffer;
> /* Flags set from whitelist */
> @@ -192,9 +196,15 @@ int s2ram_prepare(void)
> }
>
> /* Actually enter the suspend. May be ran on frozen system. */
> -int s2ram_do(void)
> +int s2ram_do(int frozen, int snapshot_fd)
> {
> int ret = 0;
> + if (frozen) {
> + printf("calling suspend_to_ram ioctl\n");
> + ret = suspend_to_ram(snapshot_fd);
> + goto out;
> + }
> +
> FILE *f = fopen("/sys/power/state", "w");
> if (!f) {
> printf("/sys/power/state does not exist; what kind of ninja
> mutant machine is this?\n");
> @@ -211,6 +221,7 @@ int s2ram_do(void)
> ret = errno;
> perror("s2ram_do");
> }
> + out:
> return ret;
> }
>
> @@ -267,7 +278,7 @@ static void usage(void)
> int main(int argc, char *argv[])
> {
> int i, id = -1, ret = 0, test_mode = 0, force = 0;
> - int active_console = -1;
> + int active_console = -1, snapshot_fd = -1, frozen = 0;
> struct option options[] = {
> { "test", no_argument, NULL, 'n'},
> { "help", no_argument, NULL, 'h'},
> @@ -354,13 +365,24 @@ int main(int argc, char *argv[])
> printf("Switching from vt%d to vt1\n", active_console);
> chvt(1);
>
> + snapshot_fd = open("/dev/snapshot", O_RDONLY);
> + if (snapshot_fd < 0)
> + fprintf(stderr, "s2ram: Could not open the snapshot device\n");
> + else
> + frozen = !freeze(snapshot_fd);
> +
> + fprintf(stderr, "frozen: %d\n", frozen);
> ret = s2ram_hacks();
> if (ret)
> goto out;
> - ret = s2ram_do();
> + ret = s2ram_do(frozen, snapshot_fd);
> s2ram_resume();
>
> out:
> + if (frozen)
> + unfreeze(snapshot_fd);
> + if (snapshot_fd > 0)
> + close(snapshot_fd);
usually it segfaults somewhere around here. Or more exactly, since i
tried reordering the stuff, it segfaults in the first glibc function
used. Not always, but every second or third suspend.
> /* if we switched consoles before suspend, switch back */
> if (active_console > 0) {
> printf("switching back to vt%d\n", active_console);
i moved this one up between unfreeze() and close(snapshot_fd), and then it
segfaulted in printf or in the chvt() following it.
> I think i need to link statically and use some mlockall() or something.
I tried this both and it did not work.
But if i switched back to vt7 manually (only tried from X), everything else
worked fine, just the s2ram segfaulted before switching back to vt7.
--
Stefan Seyfried \ "I didn't want to write for pay. I
QA / R&D Team Mobile Devices \ wanted to be paid for what I write."
SUSE LINUX Products GmbH, Nürnberg \ -- Leonard Cohen
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