set prototyped hdr nc,exec_attr mem exception.name,_exception.name math.h lib setreuid,setregid,nice,sigflag,fork,spawnveg lib pathnative,pathposix,uwin_path,uwin_unpath,fts_notify lib fchdir reference unistd.h extern nice int (int) extern setreuid int (uid_t,uid_t) extern setregid int (gid_t,gid_t)