/*
* Pull the contents of a file into an new shared memory segment. We grab
* everything from fd's current offset on.
*
* We need to know the length ahead of time so we can allocate a segment
* of sufficient size.
*/
int sysLoadFileInShmem(int fd, MemMapping* pMap)
{
loff_t start;
size_t length, actual;
void* memPtr;
assert(pMap != NULL);
if (getFileStartAndLength(fd, &start, &length) < 0)
return -1;
memPtr = sysCreateAnonShmem(length);
if (memPtr == NULL)
return -1;
actual = read(fd, memPtr, length);
if (actual != length) {
LOGE("only read %d of %d bytes\n", (int) actual, (int) length);
sysReleaseShmem(pMap);
return -1;
}
pMap->baseAddr = pMap->addr = memPtr;
pMap->baseLength = pMap->length = length;
return 0;
}
/*
* Pull the contents of a file into an new shared memory segment. We grab
* everything from fd's current offset on.
*
* We need to know the length ahead of time so we can allocate a segment
* of sufficient size.
*/
int sysLoadFileInShmem(int fd, MemMapping* pMap)
{
#ifdef HAVE_POSIX_FILEMAP
off_t start;
size_t length, actual;
void* memPtr;
assert(pMap != NULL);
if (getFileStartAndLength(fd, &start, &length) < 0)
return -1;
memPtr = sysCreateAnonShmem(length);
if (memPtr == NULL)
return -1;
actual = read(fd, memPtr, length);
if (actual != length) {
ALOGE("only read %d of %d bytes", (int) actual, (int) length);
sysReleaseShmem(pMap);
return -1;
}
pMap->baseAddr = pMap->addr = memPtr;
pMap->baseLength = pMap->length = length;
return 0;
#else
ALOGE("sysLoadFileInShmem not implemented.");
return -1;
#endif
}
/*
* Create a private anonymous storage area.
*/
int sysCreatePrivateMap(size_t length, MemMapping* pMap)
{
void* memPtr;
memPtr = sysCreateAnonShmem(length);
if (memPtr == NULL)
return -1;
pMap->addr = pMap->baseAddr = memPtr;
pMap->length = pMap->baseLength = length;
return 0;
}
