Read bytes from the VMO.
#include <zircon/syscalls.h> zx_status_t zx_vmo_read(zx_handle_t handle, void* buffer, uint64_t offset, size_t buffer_size);
zx_vmo_read() attempts to read exactly buffer_size bytes from a VMO at offset.
buffer pointer to a user buffer to read bytes into.
buffer_size number of bytes to attempt to read. buffer buffer should be large enough for at least this many bytes.
handle must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_READ.
zx_vmo_read() returns ZX_OK on success, and exactly buffer_size bytes will
have been written to buffer.
In the event of failure, a negative error value is returned, and the number of
bytes written to buffer is undefined.
ZX_ERR_BAD_HANDLE handle is not a valid handle.
ZX_ERR_WRONG_TYPE handle is not a VMO handle.
ZX_ERR_ACCESS_DENIED handle does not have the ZX_RIGHT_READ right.
ZX_ERR_INVALID_ARGS buffer is an invalid pointer or NULL.
ZX_ERR_OUT_OF_RANGE offset + buffer_size is greater than the size of the VMO.
ZX_ERR_BAD_STATE VMO has been marked uncached and is not directly readable.
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