nc 0.9.8

Access system calls directly
Documentation 
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/// Discard backing store for files
pub unsafe fn fdiscard(fd: i32, offset: off_t, len: off_t) -> Result<(), Errno> {
    let fd = fd as usize;
    let offset = offset as usize;
    let len = len as usize;
    unsafe { syscall3(SYS_FDISCARD, fd, offset, len).map(drop) }
}