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This checks that: * We can send and receive fds over Unix domain sockets using SCM_RIGHTS; * msg_controllen, cmsg_level, cmsg_type, cmsg_len are all filled in correctly on receive; * Most importantly, the received fd has or has not the close-on-exec flag set depending on whether we pass MSG_CMSG_CLOEXEC to recvmsg (). Checked on i686-gnu and x86_64-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423160548.126576-4-bugaevc@gmail.com>