1 files changed, 85 insertions, 0 deletions
diff --git a/third_party/rust/nix/src/sys/utsname.rs b/third_party/rust/nix/src/sys/utsname.rs
new file mode 100644
index 0000000000..b48ed9f45e
--- /dev/null
+++ b/third_party/rust/nix/src/sys/utsname.rs
@@ -0,0 +1,85 @@
+//! Get system identification
+use crate::{Errno, Result};
+use libc::c_char;
+use std::ffi::OsStr;
+use std::mem;
+use std::os::unix::ffi::OsStrExt;
+
+/// Describes the running system.  Return type of [`uname`].
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+#[repr(transparent)]
+pub struct UtsName(libc::utsname);
+
+impl UtsName {
+    /// Name of the operating system implementation.
+    pub fn sysname(&self) -> &OsStr {
+        cast_and_trim(&self.0.sysname)
+    }
+
+    /// Network name of this machine.
+    pub fn nodename(&self) -> &OsStr {
+        cast_and_trim(&self.0.nodename)
+    }
+
+    /// Release level of the operating system.
+    pub fn release(&self) -> &OsStr {
+        cast_and_trim(&self.0.release)
+    }
+
+    /// Version level of the operating system.
+    pub fn version(&self) -> &OsStr {
+        cast_and_trim(&self.0.version)
+    }
+
+    /// Machine hardware platform.
+    pub fn machine(&self) -> &OsStr {
+        cast_and_trim(&self.0.machine)
+    }
+
+    /// NIS or YP domain name of this machine.
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    pub fn domainname(&self) -> &OsStr {
+        cast_and_trim(&self.0.domainname)
+    }
+}
+
+/// Get system identification
+pub fn uname() -> Result<UtsName> {
+    unsafe {
+        let mut ret = mem::MaybeUninit::zeroed();
+        Errno::result(libc::uname(ret.as_mut_ptr()))?;
+        Ok(UtsName(ret.assume_init()))
+    }
+}
+
+fn cast_and_trim(slice: &[c_char]) -> &OsStr {
+    let length = slice
+        .iter()
+        .position(|&byte| byte == 0)
+        .unwrap_or(slice.len());
+    let bytes =
+        unsafe { std::slice::from_raw_parts(slice.as_ptr().cast(), length) };
+
+    OsStr::from_bytes(bytes)
+}
+
+#[cfg(test)]
+mod test {
+    #[cfg(target_os = "linux")]
+    #[test]
+    pub fn test_uname_linux() {
+        assert_eq!(super::uname().unwrap().sysname(), "Linux");
+    }
+
+    #[cfg(any(target_os = "macos", target_os = "ios"))]
+    #[test]
+    pub fn test_uname_darwin() {
+        assert_eq!(super::uname().unwrap().sysname(), "Darwin");
+    }
+
+    #[cfg(target_os = "freebsd")]
+    #[test]
+    pub fn test_uname_freebsd() {
+        assert_eq!(super::uname().unwrap().sysname(), "FreeBSD");
+    }
+}