Function mmap

src/backend/linux_raw/mm/syscalls.rs:44–79

(
    addr: *mut c_void,
    length: usize,
    prot: ProtFlags,
    flags: MapFlags,
    fd: BorrowedFd<'_>,
    offset: u64,
)

/// with memory pointed to by raw pointers is unsafe.
#[inline]
pub(crate) unsafe fn mmap(
    addr: *mut c_void,
    length: usize,
    prot: ProtFlags,
    flags: MapFlags,
    fd: BorrowedFd<'_>,
    offset: u64,
) -> io::Result<*mut c_void> {
    #[cfg(target_pointer_width = "32")]
    {
        ret_void_star(syscall!(
            __NR_mmap2,
            addr,
            pass_usize(length),
            prot,
            flags,
            fd,
            (offset / 4096)
                .try_into()
                .map(pass_usize)
                .map_err(|_| io::Errno::INVAL)?
        ))
    }
    #[cfg(target_pointer_width = "64")]
    {
        ret_void_star(syscall!(
            __NR_mmap,
            addr,
            pass_usize(length),
            prot,
            flags,
            fd,
            loff_t_from_u64(offset)
        ))
    }
}

/// # Safety
///