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#include "shmat.h"
#include <util/generic/guid.h>
#if defined(_win_)
#include <stdio.h>
#include "winint.h"
#elif defined(_bionic_)
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/syscall.h>
#elif defined(_unix_)
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
#if defined(_cygwin_)
#define WINAPI __stdcall
#define FILE_MAP_ALL_ACCESS ((long)983071)
#define PAGE_READWRITE 4
#define FALSE 0
extern "C" {
using HANDLE = OS_HANDLE;
using BOOL = int;
using DWORD = ui32;
using LPCTSTR = const char*;
using LPVOID = void*;
using LPCVOID = void const*;
using SIZE_T = size_t;
BOOL WINAPI CloseHandle(HANDLE hObject);
HANDLE WINAPI OpenFileMappingA(DWORD dwDesiredAccess, BOOL bInheritHandle, LPCTSTR lpName);
LPVOID WINAPI MapViewOfFile(HANDLE hFileMappingObject, DWORD DesiredAccess, DWORD FileOffsetHigh, DWORD FileOffsetLow, SIZE_T NumberOfBytesToMap);
HANDLE WINAPI CreateFileMappingA(HANDLE hFile, LPVOID lpAttributes, DWORD flProtect, DWORD MaximumSizeHigh, DWORD MaximumSizeLow, LPCTSTR lpName);
BOOL WINAPI UnmapViewOfFile(LPCVOID lpBaseAddress);
DWORD WINAPI GetLastError(void);
}
#endif
#if defined(_bionic_)
namespace {
#if !defined(__i386__)
static int shmget(key_t key, size_t size, int flag) {
if (size > PTRDIFF_MAX) {
size = SIZE_MAX;
}
return syscall(__NR_shmget, key, size, flag);
}
static void* shmat(int id, const void* addr, int flag) {
return (void*)syscall(__NR_shmat, id, addr, flag);
}
static int shmctl(int id, int cmd, void* buf) {
return syscall(__NR_shmctl, id, cmd | IPC_64, buf);
}
static int shmdt(const void* addr) {
return syscall(__NR_shmdt, addr);
}
#else
#define IPCOP_shmat 21
#define IPCOP_shmdt 22
#define IPCOP_shmget 23
#define IPCOP_shmctl 24
static int shmget(key_t key, size_t size, int flag) {
return syscall(__NR_ipc, IPCOP_shmget, key, size, flag, 0);
}
static void* shmat(int id, const void* addr, int flag) {
void* retval;
long res = syscall(__NR_ipc, IPCOP_shmat, id, flag, (long)&retval, addr);
return (res >= 0) ? retval : (void*)-1;
}
static int shmctl(int id, int cmd, void* buf) {
return syscall(__NR_ipc, IPCOP_shmctl, id, cmd | IPC_64, 0, buf);
}
static int shmdt(const void* addr) {
return syscall(__NR_ipc, IPCOP_shmdt, 0, 0, 0, addr);
}
#endif
}
#endif
TSharedMemory::TSharedMemory()
: Handle(INVALID_FHANDLE)
, Data(nullptr)
, Size(0)
{
}
#if defined(_win_)
static void FormatName(char* buf, const TGUID& id) {
sprintf(buf, "Global\\shmat-%s", GetGuidAsString(id).c_str());
}
bool TSharedMemory::Open(const TGUID& id, int size) {
//Y_ASSERT(Data == 0);
Id = id;
Size = size;
char name[100];
FormatName(name, Id);
Handle = OpenFileMappingA(FILE_MAP_ALL_ACCESS, FALSE, name);
if (Handle == 0) {
return false;
}
Data = MapViewOfFile(Handle, FILE_MAP_ALL_ACCESS, 0, 0, size);
if (Data == 0) {
//Y_ASSERT(0);
CloseHandle(Handle);
Handle = INVALID_OS_HANDLE;
return false;
}
return true;
}
bool TSharedMemory::Create(int size) {
//Y_ASSERT(Data == 0);
Size = size;
CreateGuid(&Id);
char name[100];
FormatName(name, Id);
Handle = CreateFileMappingA(INVALID_OS_HANDLE, nullptr, PAGE_READWRITE, 0, size, name);
if (Handle == 0) {
//Y_ASSERT(0);
return false;
}
Data = MapViewOfFile(Handle, FILE_MAP_ALL_ACCESS, 0, 0, size);
if (Data == 0) {
//Y_ASSERT(0);
CloseHandle(Handle);
Handle = INVALID_OS_HANDLE;
return false;
}
return true;
}
TSharedMemory::~TSharedMemory() {
if (Data) {
UnmapViewOfFile(Handle);
}
CloseHandle(Handle);
}
#else
static key_t GetKey(const TGUID& id) {
i64 id64 = (ui64)(((ui64)id.dw[0] + (ui64)id.dw[2]) << 32) + (ui64)id.dw[1] + (ui64)id.dw[3];
return id64;
}
bool TSharedMemory::Open(const TGUID& id, int size) {
Y_ABORT_UNLESS(id, "invalid shared memory guid: %s", GetGuidAsString(id).data());
//Y_ASSERT(Data == 0);
Size = size;
key_t k = GetKey(id);
int shmId = shmget(k, Size, 0777); // do not fill Handle, since IPC_RMID should be called by owner
if (shmId < 0) {
return false;
}
Data = shmat(shmId, nullptr, 0);
if (Data == nullptr) {
//Y_ASSERT(0);
return false;
}
return true;
}
bool TSharedMemory::Create(int size) {
//Y_ASSERT(Data == 0);
Size = size;
CreateGuid(&Id);
key_t k = GetKey(Id);
Handle = shmget(k, Size, IPC_CREAT | IPC_EXCL | 0777);
if (Handle < 0) {
//Y_ASSERT(0);
return false;
}
Data = shmat(Handle, nullptr, 0);
if (Data == (void*)-1) {
//Y_ASSERT(0);
shmctl(Handle, IPC_RMID, nullptr);
Handle = -1;
return false;
}
return true;
}
TSharedMemory::~TSharedMemory() {
if (Data) {
shmdt(Data);
}
if (Handle >= 0) {
shmctl(Handle, IPC_RMID, nullptr);
}
}
#endif
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