llvm-project/compiler-rt/test/msan/initgroups.cc

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// RUN: %clangxx_msan -O0 %s -o %t && %run %t
#include <sys/types.h>
#include <grp.h>
#include <unistd.h> // FreeBSD declares initgroups() here.
int main(void) {
initgroups("root", 0);
// The above fails unless you are root. Does not matter, MSan false positive
// (which we are testing for) happens anyway.
return 0;
}