O_RDONLY          456 daemons/pacemakerd/pcmkd_subdaemons.c         pcmk__open_devnull(O_RDONLY);   // stdin (fd 0)
O_RDONLY          133 lib/common/pid.c     fd = open(filename, O_RDONLY);
O_RDONLY           63 lib/common/procfs.c     fd = open(procpath, O_RDONLY);
O_RDONLY          501 lib/common/utils.c     pcmk__open_devnull(O_RDONLY);   // stdin (fd 0)