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(svn r16351) -Fix (r14773): signal handler could end in endless loop

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smatz 2009-05-18 12:01:13 +00:00
parent 9af2e38d44
commit 5fe906e149
1 changed files with 37 additions and 13 deletions
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50
src/saveload/afterload.cpp
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@ -235,14 +235,41 @@ static bool InitializeWindowsAndCaches()
return true;
}
typedef void (CDECL *SignalHandlerPointer)(int);
static SignalHandlerPointer _prev_segfault = NULL;
static SignalHandlerPointer _prev_abort = NULL;
static void CDECL HandleSavegameLoadCrash(int signum);
/**
* Replaces signal handlers of SIGSEGV and SIGABRT
* and stores pointers to original handlers in memory.
*/
static void SetSignalHandlers()
{
_prev_segfault = signal(SIGSEGV, HandleSavegameLoadCrash);
_prev_abort = signal(SIGABRT, HandleSavegameLoadCrash);
}
/**
* Resets signal handlers back to original handlers.
*/
static void ResetSignalHandlers()
{
signal(SIGSEGV, _prev_segfault);
signal(SIGABRT, _prev_abort);
}
/**
* Signal handler used to give a user a more useful report for crashes during
* the savegame loading process; especially when there's problems with the
* NewGRFs that are required by the savegame.
* @param unused well... unused
* @param signum received signal
*/
void CDECL HandleSavegameLoadCrash(int unused)
static void CDECL HandleSavegameLoadCrash(int signum)
{
ResetSignalHandlers();
char buffer[8192];
char *p = buffer;
p += seprintf(p, lastof(buffer),
@ -272,6 +299,9 @@ void CDECL HandleSavegameLoadCrash(int unused)
}
ShowInfo(buffer);
SignalHandlerPointer call = signum == SIGSEGV ? _prev_segfault : _prev_abort;
if (call != NULL) call(signum);
}
/**
@ -322,9 +352,7 @@ static void FixOwnerOfRailTrack(TileIndex t)
bool AfterLoadGame()
{
typedef void (CDECL *SignalHandlerPointer)(int);
SignalHandlerPointer prev_segfault = signal(SIGSEGV, HandleSavegameLoadCrash);
SignalHandlerPointer prev_abort = signal(SIGABRT, HandleSavegameLoadCrash);
SetSignalHandlers();
TileIndex map_size = MapSize();
Company *c;
@ -437,8 +465,7 @@ bool AfterLoadGame()
if (_networking && gcf_res != GLC_ALL_GOOD) {
SetSaveLoadError(STR_NETWORK_ERR_CLIENT_NEWGRF_MISMATCH);
/* Restore the signals */
signal(SIGSEGV, prev_segfault);
signal(SIGABRT, prev_abort);
ResetSignalHandlers();
return false;
}
@ -490,8 +517,7 @@ bool AfterLoadGame()
if (_game_mode == GM_NORMAL && !ClosestTownFromTile(0, UINT_MAX)) {
SetSaveLoadError(STR_NO_TOWN_IN_SCENARIO);
/* Restore the signals */
signal(SIGSEGV, prev_segfault);
signal(SIGABRT, prev_abort);
ResetSignalHandlers();
return false;
}
@ -554,8 +580,7 @@ bool AfterLoadGame()
SetStationGfx(t, gfx - 170 + GFX_TRUCK_BUS_DRIVETHROUGH_OFFSET);
} else {
/* Restore the signals */
signal(SIGSEGV, prev_segfault);
signal(SIGABRT, prev_abort);
ResetSignalHandlers();
return false;
}
SB(_m[t].m6, 3, 3, st);
@ -1813,8 +1838,7 @@ bool AfterLoadGame()
bool ret = InitializeWindowsAndCaches();
/* Restore the signals */
signal(SIGSEGV, prev_segfault);
signal(SIGABRT, prev_abort);
ResetSignalHandlers();
return ret;
}