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env::temp_dir returns /private/tmp on Apple instead while /tmp is #100196

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env::temp_dir returns /private/tmp on Apple instead while /tmp is #100196

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env::temp_dir returns /private/tmp on Apple instead while /tmp is
devnexen Aug 6, 2022
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devnexen Aug 20, 2022
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30 changes: 30 additions & 0 deletions library/std/src/sys/unix/os.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -586,6 +586,36 @@ pub fn temp_dir() -> PathBuf {
crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| {
if cfg!(target_os = "android") {
PathBuf::from("/data/local/tmp")
} else if cfg!(target_vendor = "apple") {
extern "C" {
fn confstr(
name: libc::c_int,
buf: *mut libc::c_char,
len: libc::size_t,
) -> libc::size_t;
}
let tmpdir = unsafe { libc::getenv(b"TMPDIR".as_ptr() as *const libc::c_char) };
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We already checked the env above. Also, don't use libc::getenv as it doesn't hold the env lock. Also, this string isn't NUL-terminated.

if tmpdir.is_null() {
let mut buf: Vec<u8> = vec![0; libc::PATH_MAX as usize];
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50 bytes should be enough in practice, but really this should have some retry logic. I was going to submit thomcc@ee1c648 as a PR at one point, but you can just integrate the changes from it.

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it s better if you do since you authored all.

const _CS_DARWIN_USER_TEMP_DIR: libc::c_int = 65537;
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Let's wait for rust-lang/libc#2883.

let s = unsafe {
confstr(
_CS_DARWIN_USER_TEMP_DIR,
buf.as_mut_ptr() as *mut libc::c_char,
libc::PATH_MAX as usize,
)
};
if s == 0 {
return PathBuf::from("/private/tmp");
}
let l = buf.iter().position(|&c| c == 0).unwrap();
buf.truncate(l as usize);
buf.shrink_to_fit();
return PathBuf::from(OsString::from_vec(buf));
}

let p = unsafe { CStr::from_ptr(tmpdir).to_bytes().to_vec() };
PathBuf::from(OsString::from_vec(p))
} else {
PathBuf::from("/tmp")
}
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