Symbol: SHM_RDONLY
sys/kern/sysv_shm.c
405
(SCARG(uap, shmflg) & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
sys/kern/sysv_shm.c
418
if ((SCARG(uap, shmflg) & SHM_RDONLY) == 0)