freebsd interceptions update proposal

ci.sh

@@ -108,7 +108,7 @@ case $HOST_TARGET in
     MIRI_TEST_TARGET=aarch64-unknown-linux-gnu run_tests
     MIRI_TEST_TARGET=aarch64-apple-darwin run_tests
     MIRI_TEST_TARGET=i686-pc-windows-gnu run_tests
-    MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal hello integer vec panic/panic concurrency/simple atomic env/var
+    MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal hello integer vec panic/panic concurrency/simple pthreads atomic env/var
     MIRI_TEST_TARGET=aarch64-linux-android run_tests_minimal hello integer vec panic/panic
     MIRI_TEST_TARGET=wasm32-wasi run_tests_minimal no_std integer strings wasm
     MIRI_TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std integer strings wasm

src/shims/unix/freebsd/foreign_items.rs

@@ -27,15 +27,25 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 this.write_null(dest)?;
             }
             "pthread_set_name_np" => {
-                let [thread, name] =
+                let [_thread, name] =
                     this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let max_len = usize::MAX; // freebsd does not seem to have a limit.
-                let res = this.pthread_setname_np(
+                let max_len = usize::MAX; // FreeBSD does not seem to have a limit.
+                // FreeBSD's pthread_set_name_np does not return anything.
+                this.pthread_setname_np(
                     this.read_scalar(thread)?,
                     this.read_scalar(name)?,
                     max_len,
                 )?;
-                this.write_scalar(res, dest)?;
+            }
+            "pthread_get_name_np" => {
+                let [_thread, name, len] =
+                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+                // FreeBSD's pthread_get_name_np does not return anything.
+                this.pthread_getname_np(
+                    this.read_scalar(thread)?,
+                    this.read_scalar(name)?,
+                    this.read_scalar(len)?,
+                )?;
             }
 
             // errno

tests/pass-dep/shims/pthreads.rs

@@ -1,18 +1,26 @@
 //@ignore-target-windows: No libc on Windows
-use std::ffi::{CStr, CString};
+use std::ffi::CStr;
+#[cfg(not(target_os = "freebsd"))]
+use std::ffi::CString;
 use std::thread;
 
 fn main() {
+    #[cfg(not(target_os = "freebsd"))]
     test_mutex_libc_init_recursive();
+    #[cfg(not(target_os = "freebsd"))]
     test_mutex_libc_init_normal();
+    #[cfg(not(target_os = "freebsd"))]
     test_mutex_libc_init_errorcheck();
+    #[cfg(not(target_os = "freebsd"))]
     test_rwlock_libc_static_initializer();
+
     test_named_thread_truncation();
 
     #[cfg(target_os = "linux")]
     test_mutex_libc_static_initializer_recursive();
 }
 
+#[cfg(not(target_os = "freebsd"))]
 fn test_mutex_libc_init_recursive() {
     unsafe {
         let mut attr: libc::pthread_mutexattr_t = std::mem::zeroed();
@@ -37,6 +45,7 @@ fn test_mutex_libc_init_recursive() {
     }
 }
 
+#[cfg(not(target_os = "freebsd"))]
 fn test_mutex_libc_init_normal() {
     unsafe {
         let mut mutexattr: libc::pthread_mutexattr_t = std::mem::zeroed();
@@ -59,6 +68,7 @@ fn test_mutex_libc_init_normal() {
     }
 }
 
+#[cfg(not(target_os = "freebsd"))]
 fn test_mutex_libc_init_errorcheck() {
     unsafe {
         let mut mutexattr: libc::pthread_mutexattr_t = std::mem::zeroed();
@@ -104,6 +114,7 @@ fn test_mutex_libc_static_initializer_recursive() {
 // Testing the behavior of std::sync::RwLock does not fully exercise the pthread rwlock shims, we
 // need to go a layer deeper and test the behavior of the libc functions, because
 // std::sys::unix::rwlock::RWLock itself keeps track of write_locked and num_readers.
+#[cfg(not(target_os = "freebsd"))]
 fn test_rwlock_libc_static_initializer() {
     let rw = std::cell::UnsafeCell::new(libc::PTHREAD_RWLOCK_INITIALIZER);
     unsafe {
@@ -137,6 +148,14 @@ fn test_named_thread_truncation() {
     fn set_thread_name(name: &CStr) -> i32 {
         #[cfg(target_os = "linux")]
         return unsafe { libc::pthread_setname_np(libc::pthread_self(), name.as_ptr().cast()) };
+        #[cfg(target_os = "freebsd")]
+        unsafe {
+            // pthread_set_name_np does not return anything only it can fail if the
+            // thread id is invalid
+            libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr().cast())
+        };
+        #[cfg(target_os = "freebsd")]
+        return 0;
         #[cfg(target_os = "macos")]
         return unsafe { libc::pthread_setname_np(name.as_ptr().cast()) };
     }
@@ -147,16 +166,25 @@ fn test_named_thread_truncation() {
 
         // But the system is limited -- make sure we successfully set a truncation.
         let mut buf = vec![0u8; long_name.len() + 1];
+        #[cfg(not(target_os = "freebsd"))]
         unsafe {
             libc::pthread_getname_np(libc::pthread_self(), buf.as_mut_ptr().cast(), buf.len())
         };
+        #[cfg(target_os = "freebsd")]
+        unsafe {
+            // pthread_get_name_np does not return anything only it can fail if the
+            // thread id is invalid
+            libc::pthread_get_name_np(libc::pthread_self(), buf.as_mut_ptr().cast(), buf.len())
+        };
         let cstr = CStr::from_bytes_until_nul(&buf).unwrap();
-        assert!(cstr.to_bytes().len() >= 15); // POSIX seems to promise at least 15 chars
+        assert!(cstr.to_bytes().len() >= 15, "name is too short: len={}", cstr.to_bytes().len()); // POSIX seems to promise at least 15 chars
         assert!(long_name.as_bytes().starts_with(cstr.to_bytes()));
 
         // Also test directly calling pthread_setname to check its return value.
         assert_eq!(set_thread_name(&cstr), 0);
-        // But with a too long name it should fail.
+        // But with a too long name it should fail (except on FreeBSD where the
+        // function has no return, hence cannot indicate failure).
+        #[cfg(not(target_os = "freebsd"))]
         assert_ne!(set_thread_name(&CString::new(long_name).unwrap()), 0);
     });
     result.unwrap().join().unwrap();