[LTP] [PATCH v1 3/4] syscalls/shmget05: Add test for /proc/sys/kernel/shm_next_id

[xuyang2018.jy@fujitsu.com]

Hi
Ping.

ps:On lastest ltp, this patch still can be merged without rebase.

Best Regards
Yang Xu
> Hi Cyril
> 
> Since the previous patches have been merged, this patch can be continued.
> 
> Best Regards
> Yang Xu
>> This case is similar to msgget04.c.
>>
>> Signed-off-by: Yang Xu<xuyang2018.jy@fujitsu.com>
>> ---
>>    runtest/syscalls                              |  1 +
>>    runtest/syscalls-ipc                          |  1 +
>>    .../kernel/syscalls/ipc/shmget/.gitignore     |  1 +
>>    .../kernel/syscalls/ipc/shmget/shmget05.c     | 69 +++++++++++++++++++
>>    4 files changed, 72 insertions(+)
>>    create mode 100644 testcases/kernel/syscalls/ipc/shmget/shmget05.c
>>
>> diff --git a/runtest/syscalls b/runtest/syscalls
>> index 2dff25984..63d821e53 100644
>> --- a/runtest/syscalls
>> +++ b/runtest/syscalls
>> @@ -1402,6 +1402,7 @@ shmdt02 shmdt02
>>    shmget02 shmget02
>>    shmget03 shmget03
>>    shmget04 shmget04
>> +shmget05 shmget05
>>
>>    sigaction01 sigaction01
>>    sigaction02 sigaction02
>> diff --git a/runtest/syscalls-ipc b/runtest/syscalls-ipc
>> index b3bd37923..ff0364704 100644
>> --- a/runtest/syscalls-ipc
>> +++ b/runtest/syscalls-ipc
>> @@ -67,3 +67,4 @@ shmdt02 shmdt02
>>    shmget02 shmget02
>>    shmget03 shmget03
>>    shmget04 shmget04
>> +shmget05 shmget05
>> diff --git a/testcases/kernel/syscalls/ipc/shmget/.gitignore b/testcases/kernel/syscalls/ipc/shmget/.gitignore
>> index c57df68f5..6f08529f8 100644
>> --- a/testcases/kernel/syscalls/ipc/shmget/.gitignore
>> +++ b/testcases/kernel/syscalls/ipc/shmget/.gitignore
>> @@ -1,3 +1,4 @@
>>    /shmget02
>>    /shmget03
>>    /shmget04
>> +/shmget05
>> diff --git a/testcases/kernel/syscalls/ipc/shmget/shmget05.c b/testcases/kernel/syscalls/ipc/shmget/shmget05.c
>> new file mode 100644
>> index 000000000..601609648
>> --- /dev/null
>> +++ b/testcases/kernel/syscalls/ipc/shmget/shmget05.c
>> @@ -0,0 +1,69 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/*
>> + * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
>> + * Author: Yang Xu<xuyang2018.jy@fujitsu.com>
>> + */
>> +
>> +/*\
>> + * [Description]
>> + *
>> + * It is a basic test about shm_next_id.
>> + *
>> + * shm_next_id specifies desired id for next allocated IPC shared memory. By
>> + * default they are equal to -1, which means generic allocation logic.
>> + * Possible values to set are in range {0..INT_MAX}.
>> + * Toggle with non-default value will be set back to -1 by kernel after
>> + * successful IPC object allocation.
>> + */
>> +
>> +#include<errno.h>
>> +#include<string.h>
>> +#include<sys/types.h>
>> +#include<sys/ipc.h>
>> +#include<sys/shm.h>
>> +#include "tst_test.h"
>> +#include "tst_safe_sysv_ipc.h"
>> +#include "libnewipc.h"
>> +
>> +#define NEXT_ID_PATH "/proc/sys/kernel/shm_next_id"
>> +static int shm_id, pid;
>> +static key_t shmkey;
>> +
>> +static void verify_shmget(void)
>> +{
>> +	SAFE_FILE_PRINTF(NEXT_ID_PATH, "%d", pid);
>> +
>> +	shm_id = SAFE_SHMGET(shmkey, SHM_SIZE, SHM_RW | IPC_CREAT);
>> +	if (shm_id == pid)
>> +		tst_res(TPASS, "shm_next_id succeeded, shm id %d", pid);
>> +	else
>> +		tst_res(TFAIL, "shm_next_id failed, expected id %d, but got %d", pid, shm_id);
>> +
>> +	TST_ASSERT_INT(NEXT_ID_PATH, -1);
>> +	SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
>> +	pid++;
>> +}
>> +
>> +static void setup(void)
>> +{
>> +	shmkey = GETIPCKEY();
>> +	pid = getpid();
>> +}
>> +
>> +static void cleanup(void)
>> +{
>> +	if (shm_id != -1)
>> +		SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
>> +}
>> +
>> +static struct tst_test test = {
>> +	.needs_tmpdir = 1,
>> +	.setup = setup,
>> +	.cleanup = cleanup,
>> +	.test_all = verify_shmget,
>> +	.needs_kconfigs = (const char *[]) {
>> +		"CONFIG_CHECKPOINT_RESTORE=y",
>> +		NULL
>> +	},
>> +	.needs_root = 1,
>> +};
>