arch/all-android/kernel/displayalert.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Display an alert in Android GUI if possible
   6     Lang: english
   7 */
   8
   9 #include <aros/atomic.h>
  10 #include <aros/libcall.h>
  11 #include <proto/exec.h>
  12
  13 #include <inttypes.h>
  14 #include <signal.h>
  15
  16 #include "kernel_base.h"
  17 #include "kernel_debug.h"
  18 #include "kernel_intern.h"
  19 #include "kernel_unix.h"
  20 #include "kernel_android.h"
  21
  22 #define D(x)
  23
  24 AROS_LH2(void, KrnDisplayAlert,
  25          AROS_LHA(uint32_t, code, D0),
  26          AROS_LHA(const char *, text, A0),
  27          struct KernelBase *, KernelBase, 35, Kernel)
  28 {
  29     AROS_LIBFUNC_INIT
  30
  31     struct KernelInterface *KernelIFace = KernelBase->kb_PlatformData->iface;
  32     int res;
  33     sigset_t sigs;
  34
  35     /*
  36      * These two are inlined in Android.
  37      * Enable also SIGTERM - what if AROS will want to kill us...
  38      */
  39     sigemptyset(&sigs);
  40     sigaddset(&sigs, SIGUSR2);
  41     sigaddset(&sigs, SIGTERM);
  42
  43
  44     /* Halt the system in order not to interfere with our I/O */
  45     Disable();
  46
  47     /* Send alert message to the display server */
  48     if (!SendAlert(code, text))
  49     {
  50         /* Standard pipe break reaction, see display driver code */
  51         ShutdownA(SD_ACTION_POWEROFF);
  52     }
  53
  54     D(bug("[KrnDisplayAlert] Request sent, halting...\n"));
  55
  56     if (!KernelIFace)
  57     {
  58         /* This is early alert, KernelBase is incomplete, and the condition is not recoverable. */
  59         ShutdownA(SD_ACTION_POWEROFF);
  60     }
  61
  62     /*
  63      * Wait for SIGUSR2. Java side will deliver it to us after the alert was closed.
  64      * Normally it's used for KrnCause(), and in order not to execute scheduler and
  65      * SoftInts, we artificially raise our virtual privilege level.
  66      */
  67     AROS_ATOMIC_INC(UKB(KernelBase)->SupervisorCount);
  68     KernelIFace->sigwait(&sigs, &res);
  69     AROS_ATOMIC_DEC(UKB(KernelBase)->SupervisorCount);
  70
  71     D(bug("[KrnDisplayAlert] Resume execution\n"));
  72
  73     /* Recovered... */
  74     Enable();
  75
  76     AROS_LIBFUNC_EXIT
  77 }