SIG_ERR            50 srclib/apr/include/apr_signal.h #undef SIG_ERR
SIG_ERR            53 srclib/apr/include/apr_signal.h #define SIG_ERR (void (*)(int))-1
SIG_ERR            67 srclib/apr/include/apr_signal.h #define SIG_ERR ((apr_sigfunc_t *) -1)