Hi!
> --- /dev/null
> +++ b/testcases/kernel/containers/sysvipc/shm_comm.c
> @@ -0,0 +1,215 @@
> +/* Copyright (c) 2014 Red Hat, Inc.
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of version 2 the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + ***********************************************************************
> + * File: shm_comm.c
> + *
> + * Description:
> + * 1. Clones two child processes with CLONE_NEWIPC flag, each child
> + * allocates System V shared memory segment (shm) with the _identical_
> + * key and attaches that segment into its address space.
> + * 2. Child1 writes into the shared memory segment.
> + * 3. Child2 writes into the shared memory segment.
> + * 4. Writes to the shared memory segment with the identical key but from
> + * two different IPC namespaces should not interfere with each other
> + * and so child1 checks whether its shared segment wasn't changed
> + * by child2, if it wasn't test passes, otherwise test fails.
> + */
> +
> +#define _GNU_SOURCE
> +#include <sys/ipc.h>
> +#include <sys/shm.h>
> +#include <sys/types.h>
> +#include <sys/wait.h>
> +#include <stdio.h>
> +#include <errno.h>
> +#include "usctest.h"
> +#include "test.h"
> +#include "safe_macros.h"
> +#include "libclone.h"
> +#include "ipcns_helper.h"
> +
> +
> +#define TESTKEY 124426L
> +#define SHMSIZE 50
> +char *TCID = "shm_comm";
> +int TST_TOTAL = 1;
> +int p1[2];
> +int p2[2];
> +
> +
> +static void setup(void)
> +{
> + tst_require_root(NULL);
> + check_newipc();
> +}
> +
> +int chld1_shm(void *arg)
> +{
> + int id, rval = 0;
> + char *shmem, buf;
> +
> + close(p1[0]);
> + close(p2[1]);
> +
> + /* allocate a System V shared memory segment */
> + id = shmget(TESTKEY, SHMSIZE, IPC_CREAT);
> + if (id == -1) {
> + perror("shmget");
> + close(p1[1]);
> + close(p2[0]);
> + return 2;
> + }
> +
> + /* attach the segment reffered by id into the child1 data space */
> + if ((shmem = shmat(id, NULL, 0)) == (char *) -1) {
> + perror("shmat");
> + close(p1[1]);
> + close(p2[0]);
> + shmctl(id, IPC_RMID, NULL);
> + return 2;
> + }
> +
> + /* write to the shared segment */
> + *shmem = 'A';
The comments here are more or less useless, everybody can see that
shmat() does attach the memory.
> + /* tell child2 to continue */
> + write(p1[1], "1", 1);
> +
> + /* wait for child2 */
> + read(p2[0], &buf, 1);
Please use the CHECKPOINT interface instead.
> + /* if child1 shared segment has changed (by child2) report fail */
> + if (*shmem != 'A')
> + rval = 1;
> +
> + /* tell child2 to continue */
> + write(p1[1], "1", 1);
> +
> + close(p1[1]);
> + close(p2[0]);
> +
> + /* detaches the shared memory segment */
> + shmdt(shmem);
> + /* remove the shared memory segment */
> + shmctl(id, IPC_RMID, NULL);
Here the comments are redundant as well.
> + return rval;
> +}
> +
> +int chld2_shm(void *arg)
> +{
> + int id;
> + char *shmem, buf;
> +
> + close(p1[1]);
> + close(p2[0]);
> +
> + /* allocate a System V shared memory segment */
> + id = shmget(TESTKEY, SHMSIZE, IPC_CREAT);
> + if (id == -1) {
> + perror("shmget");
> + close(p1[0]);
> + close(p2[1]);
> + return 2;
> + }
> +
> + /* attach the segment referred by id into the child2 data space */
> + if ((shmem = shmat(id, NULL, 0)) == (char *) -1) {
> + perror("shmat");
> + close(p1[0]);
> + close(p2[1]);
> + shmctl(id, IPC_RMID, NULL);
> + return 2;
> + }
> +
> + /* wait for child1 to write to his segment */
> + read(p1[0], &buf, 1);
> +
> + /* write to the shared segment */
> + *shmem = 'B';
> +
> + /* tell child1 to continue */
> + write(p2[1], "1", 1);
> +
> + /* wait for child1 */
> + read(p1[0], &buf, 1);
> +
> + close(p1[0]);
> + close(p2[1]);
> +
> + /* detaches the shared memory segment */
> + shmdt(shmem);
> + /* remove the shared memory segment */
> + shmctl(id, IPC_RMID, NULL);
Comments and CHECKPOINT interface here as well.
> + return 0;
> +}
> +
> +static void test(void)
> +{
> + int status, ret = 0;
> +
> + SAFE_PIPE(NULL, p1);
> + SAFE_PIPE(NULL, p2);
> +
> + ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld1_shm, NULL);
> + if (ret == -1)
> + tst_brkm(TBROK | TERRNO, NULL, "clone failed");
> +
> + ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld2_shm, NULL);
> + if (ret == -1)
> + tst_brkm(TBROK | TERRNO, NULL, "clone failed");
> +
> + close(p1[0]);
> + close(p1[1]);
> + close(p2[0]);
> + close(p2[1]);
> +
> + /* wait for child processes */
> + while (wait(&status) > 0) {
> + if (WIFEXITED(status) && WEXITSTATUS(status) == 1)
> + ret = 1;
> + if (WIFEXITED(status) && WEXITSTATUS(status) == 2)
> + tst_brkm(TBROK | TERRNO, NULL, "error in child");
> + if (WIFSIGNALED(status)) {
> + tst_resm(TFAIL, "child was killed with signal %s",
> + tst_strsig(WTERMSIG(status)));
> + return;
> + }
> + }
> +
> + if (ret)
> + tst_resm(TFAIL, "SysV shm: communication with identical keys"
> + " between namespaces");
> + else
> + tst_resm(TPASS, "SysV shm: communication with identical keys"
> + " between namespaces");
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + const char *msg;
> + int lc;
> +
> + msg = parse_opts(argc, argv, NULL, NULL);
> + if (msg != NULL)
> + tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
> +
> + setup();
> +
> + for (lc = 0; TEST_LOOPING(lc); lc++)
> + test();
> +
> + tst_exit();
> +}
--
Cyril Hrubis
chru...@suse.cz
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