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explain the types used in the open64 call #71921

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May 6, 2020
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explain the types used in the open64 call #71921

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4 changes: 4 additions & 0 deletions src/libstd/sys/unix/fs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -703,6 +703,10 @@ impl File {
| opts.get_access_mode()?
| opts.get_creation_mode()?
| (opts.custom_flags as c_int & !libc::O_ACCMODE);
// The third argument of `open64` is documented to have type `mode_t`. On
// some platforms (like macOS, where `open64` is actually `open`), `mode_t` is `u16`.
// However, since this is a variadic function, C integer promotion rules mean that on
// the ABI level, this still gets passed as `c_int` (aka `u32` on Unix platforms).
let fd = cvt_r(|| unsafe { open64(path.as_ptr(), flags, opts.mode as c_int) })?;
let fd = FileDesc::new(fd);

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