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//! Compare libc's CMSG(3) family of functions against the actual C macros, for
//! various inputs.
extern crate libc;
#[cfg(unix)]
mod t {
use libc::{self, c_uchar, c_uint, c_void, cmsghdr, msghdr};
use std::mem;
extern "C" {
pub fn cmsg_firsthdr(msgh: *const msghdr) -> *mut cmsghdr;
pub fn cmsg_nxthdr(
mhdr: *const msghdr,
cmsg: *const cmsghdr,
) -> *mut cmsghdr;
pub fn cmsg_space(length: c_uint) -> usize;
pub fn cmsg_len(length: c_uint) -> usize;
pub fn cmsg_data(cmsg: *const cmsghdr) -> *mut c_uchar;
}
#[test]
fn test_cmsg_data() {
for l in 0..128 {
let pcmsghdr = l as *const cmsghdr;
unsafe {
assert_eq!(libc::CMSG_DATA(pcmsghdr), cmsg_data(pcmsghdr));
}
}
}
#[test]
fn test_cmsg_firsthdr() {
let mut mhdr: msghdr = unsafe { mem::zeroed() };
mhdr.msg_control = 0xdeadbeef as *mut c_void;
let pmhdr = &mhdr as *const msghdr;
for l in 0..128 {
mhdr.msg_controllen = l;
unsafe {
assert_eq!(libc::CMSG_FIRSTHDR(pmhdr), cmsg_firsthdr(pmhdr));
}
}
}
#[test]
fn test_cmsg_len() {
for l in 0..128 {
unsafe {
assert_eq!(libc::CMSG_LEN(l) as usize, cmsg_len(l));
}
}
}
// Skip on sparc64
// https://github.com/rust-lang/libc/issues/1239
#[cfg(not(target_arch = "sparc64"))]
#[test]
fn test_cmsg_nxthdr() {
use std::ptr;
let mut buffer = [0u8; 256];
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;
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).cmsg_len = cmsg_len;
let libc_next = libc::CMSG_NXTHDR(pmhdr, pcmsghdr);
let next = cmsg_nxthdr(pmhdr, 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);
assert_eq!(libc_next, next);
}
}
}
}
}
}
#[test]
fn test_cmsg_space() {
unsafe {
for l in 0..128 {
assert_eq!(libc::CMSG_SPACE(l) as usize, cmsg_space(l));
}
}
}
}
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