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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>
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