SIG_DFL          2260 gc/os_dep.c    #   undef SIG_DFL
SIG_DFL          2261 gc/os_dep.c    #   define SIG_DFL (LPTOP_LEVEL_EXCEPTION_FILTER) (-1)
SIG_DFL          2265 gc/os_dep.c    #   undef SIG_DFL
SIG_DFL          2266 gc/os_dep.c    #   define SIG_DFL (SIG_PF) (-1)