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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Silenio Quarti
*******************************************************************************/
#include "eclipseOS.h"
#include "eclipseShm.h"
static _TCHAR* ECLIPSE_UNITIALIZED = _T_ECLIPSE("ECLIPSE_UNINITIALIZED");
#ifdef _WIN32
#include <stdio.h>
#ifdef __MINGW32__
#include <stdlib.h>
#endif
int createSharedData(_TCHAR** id, int size) {
HANDLE mapHandle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, size, NULL);
if (mapHandle == 0) return -1;
if (id != NULL) {
*id = malloc(18 * sizeof(_TCHAR));
#ifdef WIN64
_stprintf(*id, _T_ECLIPSE("%lx_%I64x"), GetCurrentProcessId(), (DWORDLONG) mapHandle);
#else
_stprintf(*id, _T_ECLIPSE("%lx_%lx"), GetCurrentProcessId(), (DWORD) mapHandle);
#endif
}
/* set the shared data to "uninitialized" */
setSharedData(*id, ECLIPSE_UNITIALIZED);
return 0;
}
static int getShmID(const _TCHAR* id, LPDWORD processID, LPHANDLE handle) {
if (id != NULL && _tcslen(id) > 0) {
DWORD i1;
#ifdef WIN64
DWORDLONG i2;
if (_stscanf(id, _T_ECLIPSE("%lx_%I64x"), &i1, &i2) != 2) return -1;
#else
DWORD i2;
if (_stscanf(id, _T_ECLIPSE("%lx_%lx"), &i1, &i2) != 2) return -1;
#endif
*processID = (DWORD)i1;
*handle = (HANDLE)i2;
return 0;
}
return -1;
}
int destroySharedData(_TCHAR* id) {
DWORD processID;
HANDLE handle;
if (getShmID(id, &processID, &handle) == -1) return -1;
if (!CloseHandle(handle)) return -1;
return 0;
}
int getSharedData(_TCHAR* id, _TCHAR** data) {
_TCHAR *sharedData, *newData = NULL;
DWORD processID;
HANDLE handle, mapHandle = NULL, processHandle;
if (getShmID(id, &processID, &handle) == -1) return -1;
if (processID == GetCurrentProcessId()) {
mapHandle = handle;
} else {
processHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, processID);
if (processHandle == NULL) return -1;
DuplicateHandle(processHandle, handle, GetCurrentProcess(), &mapHandle, DUPLICATE_SAME_ACCESS, FALSE, DUPLICATE_SAME_ACCESS);
CloseHandle(processHandle);
}
if (mapHandle == NULL) return -1;
sharedData = MapViewOfFile(handle, FILE_MAP_WRITE, 0, 0, 0);
if (sharedData == NULL) return -1;
if (_tcscmp(sharedData, ECLIPSE_UNITIALIZED)== 0) return 0;
if (data != NULL) {
size_t length = (_tcslen(sharedData) + 1) * sizeof(_TCHAR);
newData = malloc(length);
memcpy(newData, sharedData, length);
}
if (!UnmapViewOfFile(sharedData)) {
free(newData);
return -1;
}
if (handle != mapHandle) {
CloseHandle(mapHandle);
}
*data = newData;
return 0;
}
int setSharedData(const _TCHAR* id, const _TCHAR* data) {
_TCHAR* sharedData;
DWORD processID;
HANDLE handle, mapHandle = NULL, processHandle;
if (getShmID(id, &processID, &handle) == -1) return -1;
if (processID == GetCurrentProcessId()) {
mapHandle = handle;
} else {
processHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, processID);
if (processHandle == NULL) return -1;
DuplicateHandle(processHandle, handle, GetCurrentProcess(), &mapHandle, DUPLICATE_SAME_ACCESS, FALSE, DUPLICATE_SAME_ACCESS);
CloseHandle(processHandle);
}
if (mapHandle == NULL) return -1;
sharedData = MapViewOfFile(mapHandle, FILE_MAP_WRITE, 0, 0, 0);
if (sharedData == NULL) return -1;
if (data != NULL) {
size_t length = (_tcslen(data) + 1) * sizeof(_TCHAR);
memcpy(sharedData, data, length);
} else {
memset(sharedData, 0, sizeof(_TCHAR));
}
if (!UnmapViewOfFile(sharedData)) {
return -1;
}
if (handle != mapHandle) {
CloseHandle(mapHandle);
}
return 0;
}
#else /* Unix like platforms */
#include <sys/shm.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include "eclipse-memcpy.h"
int createSharedData(char** id, int size) {
int shmid;
key_t key = getpid();
if ((shmid = shmget(key, size, IPC_CREAT | 0666)) < 0) {
return -1;
}
if (id != NULL) {
*id = malloc(9 * sizeof(char));
sprintf(*id, "%x", shmid);
}
setSharedData(*id, ECLIPSE_UNITIALIZED);
return 0;
}
static int getShmID(const char* id) {
int shmid = -1;
/* Determine the shared memory id. */
if (id != NULL && strlen(id) > 0) {
sscanf(id, "%x", &shmid);
}
return shmid;
}
int destroySharedData(char* id) {
int shmid = getShmID(id);
if (shmid == -1) return -1;
return shmctl(shmid, IPC_RMID, NULL);
}
int getSharedData( char* id, char** data ) {
char *sharedData, *newData = NULL;
int length;
int shmid = getShmID(id);
if (shmid == -1) return -1;
sharedData = shmat(shmid, (void *)0, 0);
if (sharedData == (char *)(-1)) return -1;
if (_tcscmp(sharedData, ECLIPSE_UNITIALIZED) == 0) return 0;
length = strlen(sharedData) + 1;
newData = malloc(length);
memcpy(newData, sharedData, length);
if (shmdt(sharedData) != 0) {
free(newData);
return -1;
}
*data = newData;
return 0;
}
int setSharedData(const char* id, const char* data) {
char* sharedData;
int length;
int shmid = getShmID(id);
if (shmid == -1) return -1;
sharedData = shmat(shmid, (void *)0, 0);
if (sharedData == (char *)(-1)) return -1;
if (data != NULL) {
length = strlen(data) + 1;
memcpy(sharedData, data, length);
} else {
memset(sharedData, 0, sizeof(char));
}
if (shmdt(sharedData) != 0) {
return -1;
}
return 0;
}
#endif /* Unix like platforms */
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