Scm_SysSigmask   2583 src/gauche.h   SCM_EXTERN ScmObj Scm_SysSigmask(int how, ScmSysSigset *newmask);
Scm_SysSigmask   1070 src/syslib.c   SCM_RESULT = Scm_SysSigmask(how, mask);