X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/b9c917bd62e7b1eb227d4f3a7321559ddb96e494..aa91826f:/apt-pkg/contrib/mmap.cc

diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index 3e6ef3520..8e169027e 100644
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -22,11 +22,11 @@
 #include <apt-pkg/mmap.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/fileutl.h>
+#include <apt-pkg/macros.h>
 
+#include <string>
 #include <sys/mman.h>
-#include <sys/stat.h>
 #include <unistd.h>
-#include <fcntl.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <cstring>
@@ -156,11 +156,10 @@ bool MMap::Close(bool DoSync)
 /* This is done in syncronous mode - the docs indicate that this will 
    not return till all IO is complete */
 bool MMap::Sync()
-{   
+{
    if ((Flags & UnMapped) == UnMapped)
       return true;
-   
-#ifdef _POSIX_SYNCHRONIZED_IO   
+
    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != NULL)
@@ -170,11 +169,12 @@ bool MMap::Sync()
       }
       else
       {
+#ifdef _POSIX_SYNCHRONIZED_IO
 	 if (msync((char *)Base, iSize, MS_SYNC) < 0)
 	    return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
       }
    }
-#endif   
    return true;
 }
 									/*}}}*/
@@ -185,9 +185,7 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
 {
    if ((Flags & UnMapped) == UnMapped)
       return true;
-   
-#ifdef _POSIX_SYNCHRONIZED_IO
-   unsigned long long PSize = sysconf(_SC_PAGESIZE);
+
    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != 0)
@@ -198,11 +196,13 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
       }
       else
       {
-	 if (msync((char *)Base+(unsigned long long)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0)
+#ifdef _POSIX_SYNCHRONIZED_IO
+	 unsigned long long const PSize = sysconf(_SC_PAGESIZE);
+	 if (msync((char *)Base+(Start/PSize)*PSize, Stop - Start, MS_SYNC) < 0)
 	    return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
       }
    }
-#endif   
    return true;
 }
 									/*}}}*/
@@ -215,9 +215,6 @@ DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Work
 		MMap(F,Flags | NoImmMap), Fd(&F), WorkSpace(Workspace),
 		GrowFactor(Grow), Limit(Limit)
 {
-   if (_error->PendingError() == true)
-      return;
-
    // disable Moveable if we don't grow
    if (Grow == 0)
       this->Flags &= ~Moveable;
@@ -252,9 +249,6 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
 		MMap(Flags | NoImmMap | UnMapped), Fd(0), WorkSpace(WorkSpace),
 		GrowFactor(Grow), Limit(Limit)
 {
-	if (_error->PendingError() == true)
-		return;
-
 	// disable Moveable if we don't grow
 	if (Grow == 0)
 		this->Flags &= ~Moveable;
@@ -352,6 +346,12 @@ unsigned long DynamicMMap::RawAllocate(unsigned long long Size,unsigned long Aln
    size in the file. */
 unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
 {
+   if (unlikely(ItemSize == 0))
+   {
+      _error->Fatal("Can't allocate an item of size zero");
+      return 0;
+   }
+
    // Look for a matching pool entry
    Pool *I;
    Pool *Empty = 0;
@@ -384,12 +384,15 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
       const unsigned long size = 20*1024;
       I->Count = size/ItemSize;
       Pool* oldPools = Pools;
+      _error->PushToStack();
       Result = RawAllocate(size,ItemSize);
+      bool const newError = _error->PendingError();
+      _error->MergeWithStack();
       if (Pools != oldPools)
 	 I += Pools - oldPools;
 
       // Does the allocation failed ?
-      if (Result == 0 && _error->PendingError())
+      if (Result == 0 && newError)
 	 return 0;
       I->Start = Result;
    }
@@ -410,9 +413,12 @@ unsigned long DynamicMMap::WriteString(const char *String,
    if (Len == (unsigned long)-1)
       Len = strlen(String);
 
+   _error->PushToStack();
    unsigned long const Result = RawAllocate(Len+1,0);
+   bool const newError = _error->PendingError();
+   _error->MergeWithStack();
 
-   if (Result == 0 && _error->PendingError())
+   if (Base == NULL || (Result == 0 && newError))
       return 0;
 
    memcpy((char *)Base + Result,String,Len);