X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/b5cabd30cc1be1c6c1ca675ceb359bab577c1905..88ac08f98958386bb268c3c756f56a1367a7a671:/apt-pkg/contrib/mmap.cc?ds=sidebyside diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc index 69fb61fca..f63f2eea1 100644 --- a/apt-pkg/contrib/mmap.cc +++ b/apt-pkg/contrib/mmap.cc @@ -16,29 +16,30 @@ ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ -#define _BSD_SOURCE +#define _DEFAULT_SOURCE +#include + #include #include +#include +#include -#include - +#include #include -#include #include -#include #include #include - #include - /*}}}*/ + +#include + /*}}}*/ // MMap::MMap - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ 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); } /*}}}*/ @@ -46,7 +47,7 @@ MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0), // --------------------------------------------------------------------- /* */ MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0), - Base(0), SyncToFd(NULL) + Base(nullptr), SyncToFd(nullptr) { } /*}}}*/ @@ -64,7 +65,7 @@ MMap::~MMap() bool MMap::Map(FileFd &Fd) { iSize = Fd.Size(); - + // Set the permissions. int Prot = PROT_READ; int Map = MAP_SHARED; @@ -75,27 +76,52 @@ bool MMap::Map(FileFd &Fd) 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 %lu bytes"), - iSize); + return _error->Errno("MMap-mmap", _("Couldn't make mmap of %llu bytes"), iSize); } return true; @@ -106,7 +132,7 @@ bool MMap::Map(FileFd &Fd) /* */ bool MMap::Close(bool DoSync) { - if ((Flags & UnMapped) == UnMapped || Base == 0 || iSize == 0) + if ((Flags & UnMapped) == UnMapped || validData() == false || iSize == 0) return true; if (DoSync == true) @@ -114,7 +140,7 @@ bool MMap::Close(bool DoSync) if (SyncToFd != NULL) { - delete[] (char *)Base; + free(Base); delete SyncToFd; SyncToFd = NULL; } @@ -134,11 +160,10 @@ 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) @@ -148,11 +173,12 @@ 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; } /*}}}*/ @@ -163,24 +189,25 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop) { if ((Flags & UnMapped) == UnMapped) return true; - -#ifdef _POSIX_SYNCHRONIZED_IO - unsigned 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+(int)(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; } /*}}}*/ @@ -190,13 +217,20 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop) /* */ 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; - - unsigned long EndOfFile = Fd->Size(); + // 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; else if(WorkSpace > 0) @@ -217,12 +251,9 @@ DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Work 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; @@ -237,11 +268,19 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace, if ((this->Flags & Fallback) != Fallback) { // Set the permissions. int Prot = PROT_READ; +#ifdef MAP_ANONYMOUS int Map = MAP_PRIVATE | MAP_ANONYMOUS; +#else + int Map = MAP_PRIVATE | MAP_ANON; +#endif if ((this->Flags & ReadOnly) != ReadOnly) Prot |= PROT_WRITE; if ((this->Flags & Public) == Public) +#ifdef MAP_ANONYMOUS Map = MAP_SHARED | MAP_ANONYMOUS; +#else + Map = MAP_SHARED | MAP_ANON; +#endif // use anonymous mmap() to get the memory Base = (unsigned char*) mmap(0, WorkSpace, Prot, Map, -1, 0); @@ -254,8 +293,7 @@ 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; } /*}}}*/ @@ -266,15 +304,18 @@ DynamicMMap::~DynamicMMap() { if (Fd == 0) { + if (validData() == false) + return; #ifdef _POSIX_MAPPED_FILES - munmap(Base, WorkSpace); -#else - delete [] (unsigned char *)Base; + if ((Flags & Fallback) != Fallback) { + munmap(Base, WorkSpace); + } else #endif + free(Base); return; } - unsigned long EndOfFile = iSize; + unsigned long long EndOfFile = iSize; iSize = WorkSpace; Close(false); if(ftruncate(Fd->Fd(),EndOfFile) < 0) @@ -284,9 +325,9 @@ DynamicMMap::~DynamicMMap() // DynamicMMap::RawAllocate - Allocate a raw chunk of unaligned space /*{{{*/ // --------------------------------------------------------------------- /* This allocates a block of memory aligned to the given size */ -unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln) +unsigned long DynamicMMap::RawAllocate(unsigned long long Size,unsigned long Aln) { - unsigned long Result = iSize; + unsigned long long Result = iSize; if (Aln != 0) Result += Aln - (iSize%Aln); @@ -298,7 +339,7 @@ unsigned long DynamicMMap::RawAllocate(unsigned 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; } } @@ -311,6 +352,12 @@ unsigned long DynamicMMap::RawAllocate(unsigned 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; @@ -343,12 +390,15 @@ 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; } @@ -362,18 +412,28 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize) /*}}}*/ // 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::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; @@ -401,7 +461,7 @@ bool DynamicMMap::Grow() { if (GrowFactor <= 0) return _error->Error(_("Unable to increase size of the MMap as automatic growing is disabled by user.")); - unsigned long const newSize = WorkSpace + GrowFactor; + unsigned long long const newSize = WorkSpace + GrowFactor; if(Fd != 0) { Fd->Seek(newSize - 1); @@ -430,9 +490,14 @@ bool DynamicMMap::Grow() { if ((Flags & Moveable) != Moveable) return false; - Base = realloc(Base, newSize); - if (Base == NULL) + auto Temp = realloc(Base, newSize); + if (Temp == NULL) return false; + else { + Base = Temp; + /* Set new memory to 0 */ + memset((char*)Base + WorkSpace, 0, newSize - WorkSpace); + } } Pools =(Pool*) Base + poolOffset;