[LTP] [PATCH 2/2] syscalls/wait02.c: Convert to new API

[Cyril Hrubis]

Hi!
> Take use of macros and clean up.
> 
> Signed-off-by: Zenghui Gao <gaozh.jy@fujitsu.com>
> Reviewed-by: Xiao Yang <yangx.jy@fujitsu.com>
> ---
>  testcases/kernel/syscalls/wait/wait02.c | 106 ++++++------------------
>  1 file changed, 25 insertions(+), 81 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/wait/wait02.c b/testcases/kernel/syscalls/wait/wait02.c
> index 5695c071c..111849f2a 100644
> --- a/testcases/kernel/syscalls/wait/wait02.c
> +++ b/testcases/kernel/syscalls/wait/wait02.c
> @@ -1,103 +1,47 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
>  /*
>   * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
>   *    AUTHOR		: William Roske
>   *    CO-PILOT		: Dave Fenner
> + *\

I'm not sure that starting sequence in the middle of comment would be
picked up by the docparser. Either way the documentation comment should
really be a separate comment.

> + * [Description]
>   *
> - * This program is free software; you can redistribute it and/or modify it
> - * under the terms of version 2 of the GNU General Public License as
> - * published by the Free Software Foundation.

Since this is SGI copyright we have to keep GPL-2.0 for the SPDX as
well.

> - * This program is distributed in the hope that it would be useful, but
> - * WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> - *
> - * Further, this software is distributed without any warranty that it is
> - * free of the rightful claim of any third person regarding infringement
> - * or the like.  Any license provided herein, whether implied or
> - * otherwise, applies only to this software file.  Patent licenses, if
> - * any, provided herein do not apply to combinations of this program with
> - * other software, or any other product whatsoever.
> - *
> - * You should have received a copy of the GNU General Public License along
> - * with this program; if not, write the Free Software Foundation, Inc.,
> - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> - *
> - * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
> - * Mountain View, CA  94043, or:
> - *
> - * http://www.sgi.com
> - *
> - * For further information regarding this notice, see:
> - *
> - * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
> - *
> + * For a terminated child, test whether wait(2) can get its pid
> + * and exit status correctly.
>   */
>  
>  #include <errno.h>
> -#include <string.h>
> -#include <signal.h>
> -#include <stdlib.h>
>  #include <sys/types.h>
>  #include <sys/wait.h>
> -#include "test.h"
> -
> -static void setup(void);
> -static void cleanup(void);
> -
> -char *TCID = "wait02";
> -int TST_TOTAL = 1;
> -
> -static void wait_verify(void);
> -
> -int main(int ac, char **av)
> -{
> -	int lc;
> -
> -	tst_parse_opts(ac, av, NULL, NULL);
> -
> -	setup();
> -
> -	for (lc = 0; TEST_LOOPING(lc); lc++) {
> -		tst_count = 0;
> -		wait_verify();
> -	}
> -
> -	cleanup();
> -	tst_exit();
> -}
> -
> -static void setup(void)
> -{
> -	tst_sig(FORK, DEF_HANDLER, cleanup);
> -
> -	TEST_PAUSE;
> -}
> +#include <stdlib.h>
> +#include "tst_test.h"
>  
> -static void wait_verify(void)
> +static void verify_wait(void)
>  {
> -	int fork_pid, status, exit_child = 1;
> +	int status, exit_child = 1;
> +	pid_t fpid;
>  
> -	fork_pid = FORK_OR_VFORK();
> -	if (fork_pid == -1) {
> -		tst_brkm(TBROK | TERRNO, cleanup, "fork() Failure");
> -	} else if (fork_pid == 0) {
> -		sleep(1);
> +	fpid = SAFE_FORK();
> +	if (fpid == 0)
>  		exit(exit_child);
> -	}
>  
>  	TEST(wait(&status));
> +	if (TST_RET == -1) {
> +		tst_res(TFAIL | TTERRNO, "wait() failed");
> +		return;
> +	}

I guess that we should add TST_EXP_PID(), I guess that it would be
basically the same as TST_EXP_FD(). Can you add it or should I do that?

> -	if (TEST_RETURN == -1) {
> -		tst_resm(TFAIL | TTERRNO, "wait(1) Failed");
> +	if (fpid != TST_RET) {
> +		tst_res(TFAIL, "wait() returned wrong pid %ld, expected %d",
> +			TST_RET, fpid);
>  	} else if (WIFEXITED(status) && WEXITSTATUS(status) == exit_child) {
> -		tst_resm(TPASS, "wait(&status) returned %ld", TEST_RETURN);
> +		tst_res(TPASS, "wait() succeeded");
>  	} else {
> -		tst_resm(TFAIL,
> -			 "wait(1) Failed, exit_child - 0x%x, status - 0x%x",
> -			 exit_child, status);
> +		tst_res(TFAIL, "wait() got wrong exit status 0x%x", status);
>  	}
>  }

This could be made a bit simpler by using return instead of else as:

	if (foo) {
		tst_res(TFAIL, ...);
		return;
	}

	if (bar) {
		tst_res(TPASS, ...);
		return;
	}

	tst_res(...);

At least I find this style more readable.

-- 
Cyril Hrubis
chrubis@suse.cz