Rollup merge of #64640 - Wind-River:master, r=alexcrichton

No home directory on vxWorks

r? @alexcrichton

Author: Centril

src/libstd/sys/vxworks/fs.rs

@@ -529,7 +529,7 @@ pub fn stat(p: &Path) -> io::Result<FileAttr> {
     let p = cstr(p)?;
     let mut stat: stat64 = unsafe { mem::zeroed() };
     cvt(unsafe {
-        libc::lstat(p.as_ptr(), &mut stat as *mut _ as *mut _)
+        libc::stat(p.as_ptr(), &mut stat as *mut _ as *mut _)
     })?;
     Ok(FileAttr { stat })
 }

src/libstd/sys/vxworks/os.rs

@@ -287,28 +287,7 @@ pub fn temp_dir() -> PathBuf {
 }
 
 pub fn home_dir() -> Option<PathBuf> {
-    return crate::env::var_os("HOME").or_else(|| unsafe {
-        fallback()
-    }).map(PathBuf::from);
-
-    unsafe fn fallback() -> Option<OsString> {
-        let amt = match libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) {
-            n if n < 0 => 512 as usize,
-            n => n as usize,
-        };
-        let mut buf = Vec::with_capacity(amt);
-        let mut passwd: libc::passwd = mem::zeroed();
-        let mut result = ptr::null_mut();
-        match libc::getpwuid_r(libc::getuid(), &mut passwd, buf.as_mut_ptr(),
-                                buf.capacity(), &mut result) {
-            0 if !result.is_null() => {
-                let ptr = passwd.pw_dir as *const _;
-                let bytes = CStr::from_ptr(ptr).to_bytes().to_vec();
-                Some(OsStringExt::from_vec(bytes))
-            },
-            _ => None,
-        }
-    }
+    None
 }
 
 pub fn exit(code: i32) -> ! {