add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/net/msg_zerocopy.c
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@@ -650,12 +650,13 @@
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 static void do_rx(int domain, int type, int protocol)
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 {
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+	const int cfg_receiver_wait_ms = 400;
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 	uint64_t tstop;
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 	int fd;
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 	fd = do_setup_rx(domain, type, protocol);
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-	tstop = gettimeofday_ms() + cfg_runtime_ms;
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+	tstop = gettimeofday_ms() + cfg_runtime_ms + cfg_receiver_wait_ms;
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 	do {
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 		if (type == SOCK_STREAM)
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 			do_flush_tcp(fd);