Skip to content

Use aligned cmsghdr structs test_cmsg_nxthdr #3183

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Apr 3, 2023
Merged

Use aligned cmsghdr structs test_cmsg_nxthdr #3183

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
24 changes: 11 additions & 13 deletions libc-test/test/cmsg.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,34 +55,32 @@ mod t {
// https://github.com/rust-lang/libc/issues/1239
#[cfg(not(target_arch = "sparc64"))]
#[test]
// FIXME: This triggers alignment checks for pointer dereferences:
// https://github.com/rust-lang/libc/issues/3181
#[ignore]
fn test_cmsg_nxthdr() {
use std::ptr;
// Helps to align the buffer on the stack.
#[repr(align(8))]
struct Align8<T>(T);

let mut buffer = [0u8; 256];
const CAPACITY: usize = 512;
let mut buffer = Align8([0_u8; CAPACITY]);
let mut mhdr: msghdr = unsafe { mem::zeroed() };
let pmhdr = &mhdr as *const msghdr;
for start_ofs in 0..64 {
let pcmsghdr = &mut buffer[start_ofs] as *mut u8 as *mut cmsghdr;
let pcmsghdr = buffer.0.as_mut_ptr().cast::<cmsghdr>();
mhdr.msg_control = pcmsghdr as *mut c_void;
mhdr.msg_controllen = (160 - start_ofs) as _;
for cmsg_len in 0..64 {
for next_cmsg_len in 0..32 {
for i in buffer[start_ofs..].iter_mut() {
*i = 0;
}
unsafe {
pcmsghdr.cast::<u8>().write_bytes(0, CAPACITY);
(*pcmsghdr).cmsg_len = cmsg_len;
let libc_next = libc::CMSG_NXTHDR(pmhdr, pcmsghdr);
let next = cmsg_nxthdr(pmhdr, pcmsghdr);
let libc_next = libc::CMSG_NXTHDR(&mhdr, pcmsghdr);
let next = cmsg_nxthdr(&mhdr, pcmsghdr);
assert_eq!(libc_next, next);

if libc_next != ptr::null_mut() {
(*libc_next).cmsg_len = next_cmsg_len;
let libc_next = libc::CMSG_NXTHDR(pmhdr, pcmsghdr);
let next = cmsg_nxthdr(pmhdr, pcmsghdr);
let libc_next = libc::CMSG_NXTHDR(&mhdr, pcmsghdr);
let next = cmsg_nxthdr(&mhdr, pcmsghdr);
assert_eq!(libc_next, next);
}
}
Expand Down