Correctly report write errors when flushing buffered writer

[apt.git] / apt-pkg / contrib / mmap.h

diff --git a/apt-pkg/contrib/mmap.h b/apt-pkg/contrib/mmap.h
index b935ac4119f6bb7fb214b759a115d967db01132c..c1dfedf6da9b6b9d1244ec5c28414e95afc4cff1 100644 (file)
--- a/apt-pkg/contrib/mmap.h
+++ b/apt-pkg/contrib/mmap.h
@@ -1,12 +1,12 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: mmap.h,v 1.5 1998/07/15 05:56:45 jgg Exp $
+// $Id: mmap.h,v 1.12 2001/05/14 05:16:43 jgg Exp $
 /* ######################################################################
    
    MMap Class - Provides 'real' mmap or a faked mmap using read().
 
    The purpose of this code is to provide a generic way for clients to
-   access the mmap function. In enviroments that do not support mmap
+   access the mmap function. In environments that do not support mmap
    from file fd's this function will use read and normal allocated 
    memory.
    
@@ -15,50 +15,65 @@
 
    The DynamicMMap class is used to help the on-disk data structure 
    generators. It provides a large allocated workspace and members
-   to allocate space from the workspace in an effecient fashion.
+   to allocate space from the workspace in an efficient fashion.
    
    This source is placed in the Public Domain, do with it what you will
    It was originally written by Jason Gunthorpe.
    
    ##################################################################### */
                                                                        /*}}}*/
-// Header section: pkglib
 #ifndef PKGLIB_MMAP_H
 #define PKGLIB_MMAP_H
 
-#ifdef __GNUG__
-#pragma interface "apt-pkg/mmap.h"
-#endif
 
 #include <string>
+
+#ifndef APT_8_CLEANER_HEADERS
 #include <apt-pkg/fileutl.h>
+using std::string;
+#endif
+
+class FileFd;
+
+/* This should be a 32 bit type, larger tyes use too much ram and smaller
+   types are too small. Where ever possible 'unsigned long' should be used
+   instead of this internal type */
+typedef unsigned int map_ptrloc;
 
 class MMap
 {
    protected:
    
-   File &Fd;
-   unsigned long Flags;   
-   unsigned long iSize;
+   unsigned long Flags;
+   unsigned long long iSize;
    void *Base;
 
-   bool Map();
-   bool Close(bool DoClose = true,bool DoSync = true);
+   // In case mmap can not be used, we keep a dup of the file
+   // descriptor that should have been mmaped so that we can write to
+   // the file in Sync().
+   FileFd *SyncToFd;
+
+   bool Map(FileFd &Fd);
+   bool Close(bool DoSync = true);
    
    public:
 
-   enum OpenFlags {NoImmMap = (1<<0),Public = (1<<1),ReadOnly = (1<<2)};
+   enum OpenFlags {NoImmMap = (1<<0),Public = (1<<1),ReadOnly = (1<<2),
+                   UnMapped = (1<<3), Moveable = (1<<4), Fallback = (1 << 5)};
       
    // Simple accessors
    inline operator void *() {return Base;};
    inline void *Data() {return Base;}; 
-   inline unsigned long Size() {return iSize;};
+   inline unsigned long long Size() {return iSize;};
+   inline void AddSize(unsigned long long const size) {iSize += size;};
+   inline bool validData() const { return Base != (void *)-1 && Base != 0; };
    
    // File manipulators
    bool Sync();
    bool Sync(unsigned long Start,unsigned long Stop);
    
-   MMap(File &F,unsigned long Flags);
+   MMap(FileFd &F,unsigned long Flags);
+   MMap(unsigned long Flags);
    virtual ~MMap();
 };
 
@@ -76,20 +91,28 @@ class DynamicMMap : public MMap
    
    protected:
    
+   FileFd *Fd;
    unsigned long WorkSpace;
+   unsigned long const GrowFactor;
+   unsigned long const Limit;
    Pool *Pools;
    unsigned int PoolCount;
+
+   bool Grow();
    
    public:
 
    // Allocation
-   unsigned long RawAllocate(unsigned long Size,unsigned long Aln = 0);
+   unsigned long RawAllocate(unsigned long long Size,unsigned long Aln = 0);
    unsigned long Allocate(unsigned long ItemSize);
-   unsigned long WriteString(const char *String,unsigned long Len = 0);
-   inline unsigned long WriteString(string S) {return WriteString(S.begin(),S.size());};
-   void UsePools(Pool &P,unsigned int Count) {Pools = &P; PoolCount = Count;}; 
+   unsigned long WriteString(const char *String,unsigned long Len = (unsigned long)-1);
+   inline unsigned long WriteString(const std::string &S) {return WriteString(S.c_str(),S.length());};
+   void UsePools(Pool &P,unsigned int Count) {Pools = &P; PoolCount = Count;};
    
-   DynamicMMap(File &F,unsigned long Flags,unsigned long WorkSpace = 1024*1024);
+   DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &WorkSpace = 2*1024*1024,
+              unsigned long const &Grow = 1024*1024, unsigned long const &Limit = 0);
+   DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace = 2*1024*1024,
+              unsigned long const &Grow = 1024*1024, unsigned long const &Limit = 0);
    virtual ~DynamicMMap();
 };