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Define unshare() macro to avoid dependence on __GNU_SOURCE
unshare() is a linux syscall that we need. Unfortunately, access to it depends on __GNU_SOURCE, which we would like to avoid. As such, we define a macro to invoke it by its syscall code. This is necessary to avoid the following warning from Clang: implicit declaration of function 'unshare' is invalid in C99 [-Wimplicit-function-declaration] Signed-off-by: Richard Yao <email@example.com>
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