X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/5abee4863220c2d9b135dc832b33c8680e5ba12e..b49068c566d749130e023536d54588c948c16edf:/apt-pkg/contrib/mmap.cc diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc index a67ab3698..8e169027e 100644 --- a/apt-pkg/contrib/mmap.cc +++ b/apt-pkg/contrib/mmap.cc @@ -22,11 +22,11 @@ #include #include #include +#include +#include #include -#include #include -#include #include #include #include @@ -83,24 +83,26 @@ bool MMap::Map(FileFd &Fd) { if ((Flags & ReadOnly) != ReadOnly) return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str()); - Base = new unsigned char[iSize]; + Base = malloc(iSize); + SyncToFd = new FileFd(); if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false) - return 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); + Base = (Flags & Fallback) ? MAP_FAILED : mmap(0,iSize,Prot,Map,Fd.Fd(),0); if (Base == (void *)-1) { - 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 = new unsigned char[iSize]; + Base = malloc(iSize); + SyncToFd = new FileFd(); return Fd.Read(Base, iSize); } // FIXME: Writing to compressed fd's ? @@ -108,7 +110,7 @@ bool MMap::Map(FileFd &Fd) if (dupped_fd == -1) return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd()); - Base = new unsigned char[iSize]; + Base = calloc(iSize, 1); SyncToFd = new FileFd (dupped_fd); if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize)) return false; @@ -134,7 +136,7 @@ bool MMap::Close(bool DoSync) if (SyncToFd != NULL) { - delete[] (char *)Base; + free(Base); delete SyncToFd; SyncToFd = NULL; } @@ -154,11 +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) @@ -168,11 +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; } /*}}}*/ @@ -183,9 +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) @@ -196,11 +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; } /*}}}*/ @@ -213,9 +215,16 @@ 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; + +#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; @@ -240,9 +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; @@ -282,8 +288,7 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace, } #endif // fallback to a static allocated space - Base = new unsigned char[WorkSpace]; - memset(Base,0,WorkSpace); + Base = calloc(WorkSpace, 1); iSize = 0; } /*}}}*/ @@ -299,7 +304,7 @@ DynamicMMap::~DynamicMMap() #ifdef _POSIX_MAPPED_FILES munmap(Base, WorkSpace); #else - delete [] (unsigned char *)Base; + free(Base); #endif return; } @@ -328,7 +333,7 @@ unsigned long DynamicMMap::RawAllocate(unsigned long long Size,unsigned long Aln 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; } } @@ -341,6 +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; @@ -373,12 +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; } @@ -399,9 +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); @@ -463,6 +480,9 @@ bool DynamicMMap::Grow() { 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;