RFR: JDK-8310265: (process) jspawnhelper should not use argv[0] [v3]

[Thomas Stuefe]

> Reported by [jarabekit at gmail.com](mailto:jarabekit at gmail.com) [1] 
> 
> jspawnhelper uses argv[0] to receive the fd string from the parent. That breaks with conventions and trips over certain tools like binfmt_misc. 
> 
> For details, see linked ML discussion. 
> 
> [1] https://mail.openjdk.org/pipermail/core-libs-dev/2023-June/107738.html

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  feedback Volker and Roger

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14531/files
  - new: https://git.openjdk.org/jdk/pull/14531/files/1ee05c05..8f83fa27

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14531&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14531&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14531/head:pull/14531

PR: https://git.openjdk.org/jdk/pull/14531