Avoid using `lseek` + `read` in favor of `pread`. For Windows, we can do the same thing by using `OVERLAPPED`, as we are in synchronous mode we can use `Offset` and `OffsetHigh` to achieve the same thing.
Additionally I updated open to use `O_CLOEXEC` when available, as that really should be used. ------------- Commit messages: - Avoid extra seek syscall in libzip while reading Changes: https://git.openjdk.org/jdk/pull/12417/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12417&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8301621 Stats: 67 lines in 1 file changed: 17 ins; 9 del; 41 mod Patch: https://git.openjdk.org/jdk/pull/12417.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12417/head:pull/12417 PR: https://git.openjdk.org/jdk/pull/12417
