hg: jdk/sandbox: unixdomainchannels: implemented SO_PEERCRED socket option

[michael.x.mcmahon at oracle.com]

Changeset: bb7de9d8dc67
Author:    michaelm
Date:      2020-05-01 19:07 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/bb7de9d8dc67

unixdomainchannels: implemented SO_PEERCRED socket option

! src/java.base/share/classes/module-info.java
! src/java.base/share/classes/sun/net/ext/ExtendedSocketOptions.java
! src/java.base/share/classes/sun/nio/ch/UnixDomainSocketChannelImpl.java
+ src/java.base/unix/classes/sun/nio/fs/UnixUserGroupUtil.java
! src/jdk.net/linux/classes/jdk/net/LinuxSocketOptions.java
! src/jdk.net/linux/native/libextnet/LinuxSocketOptions.c
! src/jdk.net/macosx/classes/jdk/net/MacOSXSocketOptions.java
! src/jdk.net/macosx/native/libextnet/MacOSXSocketOptions.c
! src/jdk.net/share/classes/jdk/net/ExtendedSocketOptions.java
+ src/jdk.net/share/classes/jdk/net/UnixDomainPrincipal.java
! test/jdk/java/nio/channels/unixdomain/SocketOptions.java