##################################################################### */
/*}}}*/
// Include Files /*{{{*/
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
#include <config.h>
#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>
// ---------------------------------------------------------------------
/* */
MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0),
- Base(0), SyncToFd(NULL)
+ Base(nullptr), SyncToFd(nullptr)
{
- if ((Flags & NoImmMap) != NoImmMap)
Map(F);
}
/*}}}*/
// ---------------------------------------------------------------------
/* */
MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0),
- Base(0), SyncToFd(NULL)
+ Base(nullptr), SyncToFd(nullptr)
{
}
/*}}}*/
bool MMap::Map(FileFd &Fd)
{
iSize = Fd.Size();
-
+
// Set the permissions.
int Prot = PROT_READ;
int Map = MAP_SHARED;
if (iSize == 0)
return _error->Error(_("Can't mmap an empty file"));
-
+
+ // We can't mmap compressed fd's directly, so we need to read it completely
+ if (Fd.IsCompressed() == true)
+ {
+ if ((Flags & ReadOnly) != ReadOnly)
+ return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str());
+ Base = malloc(iSize);
+ if (unlikely(Base == nullptr))
+ return _error->Errno("MMap-compressed-malloc", _("Couldn't make mmap of %llu bytes"), iSize);
+ SyncToFd = new FileFd();
+ if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false)
+ return _error->Error("Compressed file %s can't be read into mmap", Fd.Name().c_str());
+ return true;
+ }
+
// Map it.
- Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0);
- if (Base == (void *)-1)
+ Base = (Flags & Fallback) ? MAP_FAILED : mmap(0,iSize,Prot,Map,Fd.Fd(),0);
+ if (Base == MAP_FAILED)
{
- if (errno == ENODEV || errno == EINVAL)
+ if (errno == ENODEV || errno == EINVAL || (Flags & Fallback))
{
// The filesystem doesn't support this particular kind of mmap.
// So we allocate a buffer and read the whole file into it.
+ if ((Flags & ReadOnly) == ReadOnly)
+ {
+ // for readonly, we don't need sync, so make it simple
+ Base = malloc(iSize);
+ if (unlikely(Base == nullptr))
+ return _error->Errno("MMap-malloc", _("Couldn't make mmap of %llu bytes"), iSize);
+ SyncToFd = new FileFd();
+ return Fd.Seek(0L) && Fd.Read(Base, iSize);
+ }
+ // FIXME: Writing to compressed fd's ?
int const dupped_fd = dup(Fd.Fd());
if (dupped_fd == -1)
return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd());
- Base = new unsigned char[iSize];
+ Base = malloc(iSize);
+ if (unlikely(Base == nullptr))
+ return _error->Errno("MMap-calloc", _("Couldn't make mmap of %llu bytes"), iSize);
SyncToFd = new FileFd (dupped_fd);
if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize))
return false;
}
else
- return _error->Errno("mmap",_("Couldn't make mmap of %llu bytes"),
- iSize);
+ return _error->Errno("MMap-mmap", _("Couldn't make mmap of %llu bytes"), iSize);
}
return true;
if (SyncToFd != NULL)
{
- delete[] (char *)Base;
+ free(Base);
delete SyncToFd;
SyncToFd = NULL;
}
/* 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)
}
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;
}
/*}}}*/
{
if ((Flags & UnMapped) == UnMapped)
return true;
-
-#ifdef _POSIX_SYNCHRONIZED_IO
- unsigned long long PSize = sysconf(_SC_PAGESIZE);
+
if ((Flags & ReadOnly) != ReadOnly)
{
if (SyncToFd != 0)
{
- if (!SyncToFd->Seek(0) ||
+ if (!SyncToFd->Seek(Start) ||
!SyncToFd->Write (((char *)Base)+Start, Stop-Start))
return false;
}
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);
+ Start = (Start/PSize)*PSize;
+ if (msync((char *)Base+Start, Stop - Start, MS_SYNC) < 0)
return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
}
}
-#endif
return true;
}
/*}}}*/
/* */
DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Workspace,
unsigned long const &Grow, unsigned long const &Limit) :
- MMap(F,Flags | NoImmMap), Fd(&F), WorkSpace(Workspace),
+ MMap(Flags), 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;
+
+#ifndef __linux__
+ // kfreebsd doesn't have mremap, so we use the fallback
+ if ((this->Flags & Moveable) == Moveable)
+ this->Flags |= Fallback;
+#endif
+
unsigned long long EndOfFile = Fd->Size();
if (EndOfFile > WorkSpace)
WorkSpace = EndOfFile;
and could come in handy later than we are able to grow such an mmap */
DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
unsigned long const &Grow, unsigned long const &Limit) :
- MMap(Flags | NoImmMap | UnMapped), Fd(0), WorkSpace(WorkSpace),
+ MMap(Flags | 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;
}
#endif
// fallback to a static allocated space
- Base = new unsigned char[WorkSpace];
- memset(Base,0,WorkSpace);
+ Base = calloc(WorkSpace, 1);
iSize = 0;
}
/*}}}*/
#ifdef _POSIX_MAPPED_FILES
munmap(Base, WorkSpace);
#else
- delete [] (unsigned char *)Base;
+ free(Base);
#endif
return;
}
if(!Grow())
{
_error->Fatal(_("Dynamic MMap ran out of room. Please increase the size "
- "of APT::Cache-Limit. Current value: %lu. (man 5 apt.conf)"), WorkSpace);
+ "of APT::Cache-Start. Current value: %lu. (man 5 apt.conf)"), WorkSpace);
return 0;
}
}
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;
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;
}
/*}}}*/
// DynamicMMap::WriteString - Write a string to the file /*{{{*/
// ---------------------------------------------------------------------
-/* Strings are not aligned to anything */
+/* Strings are aligned to 16 bytes */
unsigned long DynamicMMap::WriteString(const char *String,
unsigned long Len)
{
if (Len == (unsigned long)-1)
Len = strlen(String);
- unsigned long const Result = RawAllocate(Len+1,0);
+ _error->PushToStack();
+ unsigned long Result = RawAllocate(Len+1+sizeof(uint16_t),sizeof(uint16_t));
+ bool const newError = _error->PendingError();
+ _error->MergeWithStack();
- if (Result == 0 && _error->PendingError())
+ if (Base == NULL || (Result == 0 && newError))
return 0;
+ if (Len >= std::numeric_limits<uint16_t>::max())
+ abort();
+
+ uint16_t LenToWrite = Len;
+ memcpy((char *)Base + Result, &LenToWrite, sizeof(LenToWrite));
+ Result += + sizeof(LenToWrite);
+
memcpy((char *)Base + Result,String,Len);
((char *)Base)[Result + Len] = 0;
return Result;
Base = realloc(Base, newSize);
if (Base == NULL)
return false;
+ else
+ /* Set new memory to 0 */
+ memset((char*)Base + WorkSpace, 0, newSize - WorkSpace);
}
Pools =(Pool*) Base + poolOffset;
projects / apt.git / blobdiff