Emery Hemingway adb48b5c9e Libc: MSG_PEEK support
As discovered by Johannes Kliemann, peeking at buffered socket data
using 'recv' and 'MSG_PEEK' is not supported. Read a "peek" control file
from the socket directory to attempt to peek into buffers at the
socket_fs. Support for every feature of POSIX sockets cannot be
expected, but this one is trivial to implement.

Fix #2875
2020-05-18 10:16:15 +02:00
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