add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/bpf/urandom_read.c
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@@ -7,11 +7,19 @@
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 #define BUF_SIZE 256
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+static __attribute__((noinline))
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+void urandom_read(int fd, int count)
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+{
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+       char buf[BUF_SIZE];
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+       int i;
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+
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+       for (i = 0; i < count; ++i)
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+               read(fd, buf, BUF_SIZE);
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+}
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+
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 int main(int argc, char *argv[])
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 {
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 	int fd = open("/dev/urandom", O_RDONLY);
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-	int i;
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-	char buf[BUF_SIZE];
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 	int count = 4;
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 	if (fd < 0)
..
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@@ -20,8 +28,7 @@
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 	if (argc == 2)
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 		count = atoi(argv[1]);
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-	for (i = 0; i < count; ++i)
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-		read(fd, buf, BUF_SIZE);
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+	urandom_read(fd, count);
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 	close(fd);
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 	return 0;