RFR: 8327621: Check return value of uname in os::get_host_name [v2]

[Johan Sjölen]

> Hi,
> 
> Trivial bug fix where we didn't check the return value of `uname(2)` on POSIX platforms. I checked callers of `get_host_name` and all wrap the calls in an `if` branch so they already handle failures.
> 
> Regards,
> Johan

Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:

  Perform correct check and log warning

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18157/files
  - new: https://git.openjdk.org/jdk/pull/18157/files/f924d99c..9094ac42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18157&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18157&range=00-01

  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18157.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18157/head:pull/18157

PR: https://git.openjdk.org/jdk/pull/18157