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gsocket: Fix credentials error-handling on Apple OSes

Ole André Vadla Ravnås requested to merge oleavr/glib:fix/socket-credentials-error-handling-on-apple-oses into master
  • When querying a TCP socket, getsockopt() may succeed but the resulting “optlen” will be zero. This means we'd previously be reading uninitialized stack memory in such cases.
  • After a file-descriptor has gone through FD-passing, getsockopt() may fail with EINVAL. At least this is the case with TCP sockets.
  • While at it also use SOL_LOCAL instead of hard-coding its value.
Edited by Ole André Vadla Ravnås

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