Function gr_read

pub unsafe extern "C" fn gr_read(
    at: Offset,
    len: Length,
    buffer: *mut SizedBufferStart,
    err: *mut ErrorCode,
)

Fallible gr_read get syscall.

Arguments type:

• at: u32 defining offset in the input buffer to read from.
• len: u32 length of the buffer to read.
• buffer: mut ptr for buffer to store requested data.
• err: mut ptr for u32 error code.