X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/8e06abb2587d06891a84414f09f4910429451bf8..e5a1f2ff4cd1300364c7c644958583a8af704173:/apt-pkg/contrib/mmap.cc

diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index f8582a1ef..7a5065ffb 100644
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description								/*{{{*/
-// $Id: mmap.cc,v 1.7 1998/07/19 04:42:14 jgg Exp $
+// $Id: mmap.cc,v 1.14 1999/03/18 04:32:46 jgg Exp $
 /* ######################################################################
    
    MMap Class - Provides 'real' mmap or a faked mmap using read().
@@ -31,7 +31,6 @@
 
 #include <sys/mman.h>
 #include <sys/stat.h>
-#include <sys/user.h>
 #include <unistd.h>
 #include <fcntl.h>
    									/*}}}*/
@@ -69,6 +68,9 @@ bool MMap::Map()
    if ((Flags & Public) != Public)
       Map = MAP_PRIVATE;
    
+   if (iSize == 0)
+      return _error->Error("Can't mmap an empty file");
+   
    // Map it.
    Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0);
    if (Base == (void *)-1)
@@ -103,9 +105,11 @@ bool MMap::Close(bool DoClose, bool DoSync)
    not return till all IO is complete */
 bool MMap::Sync()
 {   
+#ifdef _POSIX_SYNCHRONIZED_IO   
    if ((Flags & ReadOnly) != ReadOnly)
       if (msync((char *)Base,iSize,MS_SYNC) != 0)
 	 return _error->Error("msync","Unable to write mmap");
+#endif   
    return true;
 }
 									/*}}}*/
@@ -114,9 +118,12 @@ bool MMap::Sync()
 /* */
 bool MMap::Sync(unsigned long Start,unsigned long Stop)
 {
+#ifdef _POSIX_SYNCHRONIZED_IO
+   unsigned long PSize = sysconf(_SC_PAGESIZE);
    if ((Flags & ReadOnly) != ReadOnly)
-      if (msync((char *)Base+(int)(Start/PAGE_SIZE)*PAGE_SIZE,Stop - Start,MS_SYNC) != 0)
+      if (msync((char *)Base+(int)(Start/PSize)*PSize,Stop - Start,MS_SYNC) != 0)
 	 return _error->Error("msync","Unable to write mmap");
+#endif   
    return true;
 }
 									/*}}}*/
@@ -127,6 +134,9 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
 DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long WorkSpace) : 
              MMap(F,Flags | NoImmMap), WorkSpace(WorkSpace)
 {
+   if (_error->PendingError() == true)
+      return;
+   
    unsigned long EndOfFile = Fd.Size();
    Fd.Seek(WorkSpace);
    char C = 0;
@@ -160,7 +170,7 @@ unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln)
    iSize = Result + Size;
    
    // Just in case error check
-   if (Result > WorkSpace)
+   if (Result + Size > WorkSpace)
    {
       _error->Error("Dynamic MMap ran out of room");
       return 0;