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Add offset handling in MemoryHeapBase class

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This commit is contained in:
Benny Wong
2009-08-17 15:28:30 -05:00
committed by James Dong
parent 41b379da57
commit f99c18083e
2 changed files with 6 additions and 6 deletions
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4
include/binder/MemoryHeapBase.h
View File

@@ -42,7 +42,7 @@ public:
* maps the memory referenced by fd. but DOESN'T take ownership
* of the filedescriptor (it makes a copy with dup()
*/
MemoryHeapBase(int fd, size_t size, uint32_t flags = 0);
MemoryHeapBase(int fd, size_t size, uint32_t flags = 0, uint32_t offset = 0);
/*
* maps memory from the given device
@@ -82,7 +82,7 @@ protected:
int flags = 0, const char* device = NULL);
private:
status_t mapfd(int fd, size_t size);
status_t mapfd(int fd, size_t size, uint32_t offset = 0);
int mFD;
size_t mSize;

8
libs/binder/MemoryHeapBase.cpp
View File

@@ -78,13 +78,13 @@ MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
}
}
MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags)
MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset)
: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
mDevice(0), mNeedUnmap(false)
{
const size_t pagesize = getpagesize();
size = ((size + pagesize-1) & ~(pagesize-1));
mapfd(dup(fd), size);
mapfd(dup(fd), size, offset);
}
status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device)
@@ -100,7 +100,7 @@ status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const cha
return NO_ERROR;
}
status_t MemoryHeapBase::mapfd(int fd, size_t size)
status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset)
{
if (size == 0) {
// try to figure out the size automatically
@@ -121,7 +121,7 @@ status_t MemoryHeapBase::mapfd(int fd, size_t size)
if ((mFlags & DONT_MAP_LOCALLY) == 0) {
void* base = (uint8_t*)mmap(0, size,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
if (base == MAP_FAILED) {
LOGE("mmap(fd=%d, size=%u) failed (%s)",
fd, uint32_t(size), strerror(errno));