3 files changed, 41 insertions, 5 deletions
diff --git a/library/std/src/sys/unix/mod.rs b/library/std/src/sys/unix/mod.rs
index 326f1481e19..77ef086f29b 100644
--- a/library/std/src/sys/unix/mod.rs
+++ b/library/std/src/sys/unix/mod.rs
@@ -110,6 +110,11 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
             while libc::poll(pfds.as_mut_ptr(), 3, 0) == -1 {
                 match errno() {
                     libc::EINTR => continue,
+                    #[cfg(target_vendor = "unikraft")]
+                    libc::ENOSYS => {
+                        // Not all configurations of Unikraft enable `LIBPOSIX_EVENT`.
+                        break 'poll;
+                    }
                     libc::EINVAL | libc::EAGAIN | libc::ENOMEM => {
                         // RLIMIT_NOFILE or temporary allocation failures
                         // may be preventing use of poll(), fall back to fcntl
@@ -165,7 +170,14 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
     }
 
     unsafe fn reset_sigpipe(#[allow(unused_variables)] sigpipe: u8) {
-        #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "horizon")))]
+        #[cfg(not(any(
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "horizon",
+            // Unikraft's `signal` implementation is currently broken:
+            // https://github.com/unikraft/lib-musl/issues/57
+            target_vendor = "unikraft",
+        )))]
         {
             // We don't want to add this as a public type to std, nor do we
             // want to `include!` a file from the compiler (which would break
diff --git a/library/std/src/sys/unix/os_str.rs b/library/std/src/sys/unix/os_str.rs
index f7333fd5a1f..463b0a27515 100644
--- a/library/std/src/sys/unix/os_str.rs
+++ b/library/std/src/sys/unix/os_str.rs
@@ -96,6 +96,16 @@ impl AsInner<[u8]> for Buf {
 }
 
 impl Buf {
+    #[inline]
+    pub fn into_os_str_bytes(self) -> Vec<u8> {
+        self.inner
+    }
+
+    #[inline]
+    pub unsafe fn from_os_str_bytes_unchecked(s: Vec<u8>) -> Self {
+        Self { inner: s }
+    }
+
     pub fn from_string(s: String) -> Buf {
         Buf { inner: s.into_bytes() }
     }
diff --git a/library/std/src/sys/unix/rand.rs b/library/std/src/sys/unix/rand.rs
index d471be33ed5..fbf158f56fc 100644
--- a/library/std/src/sys/unix/rand.rs
+++ b/library/std/src/sys/unix/rand.rs
@@ -17,7 +17,6 @@ pub fn hashmap_random_keys() -> (u64, u64) {
     not(target_os = "tvos"),
     not(target_os = "watchos"),
     not(target_os = "openbsd"),
-    not(target_os = "freebsd"),
     not(target_os = "netbsd"),
     not(target_os = "fuchsia"),
     not(target_os = "redox"),
@@ -68,11 +67,25 @@ mod imp {
         unsafe { libc::getrandom(buf.as_mut_ptr().cast(), buf.len(), 0) }
     }
 
+    #[cfg(target_os = "freebsd")]
+    fn getrandom(buf: &mut [u8]) -> libc::ssize_t {
+        // FIXME: using the above when libary std's libc is updated
+        extern "C" {
+            fn getrandom(
+                buffer: *mut libc::c_void,
+                length: libc::size_t,
+                flags: libc::c_uint,
+            ) -> libc::ssize_t;
+        }
+        unsafe { getrandom(buf.as_mut_ptr().cast(), buf.len(), 0) }
+    }
+
     #[cfg(not(any(
         target_os = "linux",
         target_os = "android",
         target_os = "espidf",
-        target_os = "horizon"
+        target_os = "horizon",
+        target_os = "freebsd"
     )))]
     fn getrandom_fill_bytes(_buf: &mut [u8]) -> bool {
         false
@@ -82,7 +95,8 @@ mod imp {
         target_os = "linux",
         target_os = "android",
         target_os = "espidf",
-        target_os = "horizon"
+        target_os = "horizon",
+        target_os = "freebsd"
     ))]
     fn getrandom_fill_bytes(v: &mut [u8]) -> bool {
         use crate::sync::atomic::{AtomicBool, Ordering};
@@ -222,7 +236,7 @@ mod imp {
     }
 }
 
-#[cfg(any(target_os = "freebsd", target_os = "netbsd"))]
+#[cfg(target_os = "netbsd")]
 mod imp {
     use crate::ptr;