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-rw-r--r--libc/libc-test/test/cmsg.rs101
1 files changed, 101 insertions, 0 deletions
diff --git a/libc/libc-test/test/cmsg.rs b/libc/libc-test/test/cmsg.rs
new file mode 100644
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--- /dev/null
+++ b/libc/libc-test/test/cmsg.rs
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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));
+ }
+ }
+ }
+
+}