Function sysctl_shmsegs

freebsd/kern/sysv_shm.c:1040–1096

}

static int
sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
{
	struct shmid_kernel tshmseg;
#ifdef COMPAT_FREEBSD32
	struct shmid_kernel32 tshmseg32;
#endif
	struct prison *pr, *rpr;
	void *outaddr;
	size_t outsize;
	int error, i;

	SYSVSHM_LOCK();
	pr = req->td->td_ucred->cr_prison;
	rpr = shm_find_prison(req->td->td_ucred);
	error = 0;
	for (i = 0; i < shmalloced; i++) {
		if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
		    rpr == NULL || shm_prison_cansee(rpr, &shmsegs[i]) != 0) {
			bzero(&tshmseg, sizeof(tshmseg));
			tshmseg.u.shm_perm.mode = SHMSEG_FREE;
		} else {
			tshmseg = shmsegs[i];
			if (tshmseg.cred->cr_prison != pr)
				tshmseg.u.shm_perm.key = IPC_PRIVATE;
		}
#ifdef COMPAT_FREEBSD32
		if (SV_CURPROC_FLAG(SV_ILP32)) {
			bzero(&tshmseg32, sizeof(tshmseg32));
			freebsd32_ipcperm_out(&tshmseg.u.shm_perm,
			    &tshmseg32.u.shm_perm);
			CP(tshmseg, tshmseg32, u.shm_segsz);
			CP(tshmseg, tshmseg32, u.shm_lpid);
			CP(tshmseg, tshmseg32, u.shm_cpid);
			CP(tshmseg, tshmseg32, u.shm_nattch);
			CP(tshmseg, tshmseg32, u.shm_atime);
			CP(tshmseg, tshmseg32, u.shm_dtime);
			CP(tshmseg, tshmseg32, u.shm_ctime);
			/* Don't copy object, label, or cred */
			outaddr = &tshmseg32;
			outsize = sizeof(tshmseg32);
		} else
#endif
		{
			tshmseg.object = NULL;
			tshmseg.label = NULL;
			tshmseg.cred = NULL;
			outaddr = &tshmseg;
			outsize = sizeof(tshmseg);
		}
		error = SYSCTL_OUT(req, outaddr, outsize);
		if (error != 0)
			break;
	}
	SYSVSHM_UNLOCK();
	return (error);
}