Modify the seek offset.
#include <zircon/syscalls.h> zx_status_t zx_stream_seek(zx_handle_t handle, zx_stream_seek_origin_t whence, int64_t offset, zx_off_t* out_seek);
zx_stream_seek() sets the seek offset of the stream to offset relative to whence.
If the resulting seek offset were to be negative or exceed the maximum representable zx_off_t, zx_stream_seek() returns ZX_ERR_INVALID_ARGS.
The resulting seek offset might extend beyond the end of the stream. Setting such a seek offset does not cause zx_stream_seek() to return an error, but attempting to read or write data at that seek offset might generate an error.
ZX_STREAM_SEEK_ORIGIN_START set the seek offset relative to the start of the stream.
ZX_STREAM_SEEK_ORIGIN_CURRENT set the seek offset relative to the current seek offset of the stream.
ZX_STREAM_SEEK_ORIGIN_END set the seek offset relative to the end of the stream, as defined by the content size of the stream.
handle must be of type ZX_OBJ_TYPE_STREAM and have ZX_RIGHT_WRITE or have ZX_RIGHT_WRITE.
zx_stream_seek() returns ZX_OK on success, and writes the resulting seek offset, relative to the start of the stream, into out_offset (if non-NULL).
ZX_ERR_BAD_HANDLE handle is not a valid handle.
ZX_ERR_WRONG_TYPE handle is not a stream handle.
ZX_ERR_ACCESS_DENIED handle does not have the ZX_RIGHT_READ or ZX_RIGHT_WRITE right.
ZX_ERR_INVALID_ARGS whence is an invalid zx_stream_seek_origin_t or the resulting seek would be negative or exceed the maximum representable zx_off_t.
