[LTP] [PATCH] syscalls/fork02: new test for fork()

[xuyang2018.jy@fujitsu.com]

Hi Zhao

> Verify that current workdir correctly inherited by child.

Why test this?  Does fork() man-pages menthion this?

Best Regards
Yang Xu

> 
> Signed-off-by: Zhao Gongyi <zhaogongyi@huawei.com>
> ---
>   runtest/syscalls                          |  1 +
>   testcases/kernel/syscalls/fork/.gitignore |  1 +
>   testcases/kernel/syscalls/fork/fork02.c   | 51 +++++++++++++++++++++++
>   3 files changed, 53 insertions(+)
>   create mode 100644 testcases/kernel/syscalls/fork/fork02.c
> 
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 7a425439a..39b7f21f6 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -364,6 +364,7 @@ flock06 flock06
>   fmtmsg01 fmtmsg01
> 
>   fork01 fork01
> +fork02 fork02
>   fork03 fork03
>   fork04 fork04
>   fork05 fork05
> diff --git a/testcases/kernel/syscalls/fork/.gitignore b/testcases/kernel/syscalls/fork/.gitignore
> index b817e9c05..8a08c586b 100644
> --- a/testcases/kernel/syscalls/fork/.gitignore
> +++ b/testcases/kernel/syscalls/fork/.gitignore
> @@ -1,4 +1,5 @@
>   /fork01
> +/fork02
>   /fork03
>   /fork04
>   /fork05
> diff --git a/testcases/kernel/syscalls/fork/fork02.c b/testcases/kernel/syscalls/fork/fork02.c
> new file mode 100644
> index 000000000..54ad50712
> --- /dev/null
> +++ b/testcases/kernel/syscalls/fork/fork02.c
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright(c) 2022 Huawei Technologies Co., Ltd
> + * Author: Zhao Gongyi <zhaogongyi@huawei.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * Verify that current workdir correctly inherited by child.
> + */
> +
> +#include "tst_test.h"
> +
> +#define NEW_DIR "new_dir"
> +
> +static char parent_cwd[PATH_MAX];
> +static char child_cwd[PATH_MAX];
> +
> +static void run(void)
> +{
> +	pid_t pid = SAFE_FORK();
> +
> +	if (!pid) {
> +		SAFE_GETCWD(child_cwd, sizeof(child_cwd));
> +		if (strcmp(child_cwd, parent_cwd)) {
> +			tst_res(TFAIL, "checking of cwd failed: "
> +					"child_cwd %s parent_cwd %s ",
> +					child_cwd, parent_cwd);
> +		} else
> +			tst_res(TPASS, "Checking of cwd passed");
> +		return;
> +	}
> +
> +	SAFE_WAITPID(pid, NULL, 0);
> +}
> +
> +static void setup(void)
> +{
> +	SAFE_MKDIR(NEW_DIR, 00770);
> +	SAFE_CHDIR(NEW_DIR);
> +	SAFE_GETCWD(parent_cwd, sizeof(parent_cwd));
> +}
> +
> +static struct tst_test test = {
> +	.setup = setup,
> +	.test_all = run,
> +	.needs_tmpdir = 1,
> +	.forks_child = 1,
> +};
> +
> --
> 2.17.1
> 
>