[v2] syscalls/send02: Ensure recv() succeed when not using MSG_MORE flag

In this test, we only check send()/sendto()/sendmsg() calls
with MSG_MORE flag whether get EAGAIN/EWOULDBLOCK error immediately.

For other flag, we just call recv again when meeting EAGAIN/EWOULDBLOCK
error.

Also, improve message and make this case more clean when failed.

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
---
 testcases/kernel/syscalls/send/send02.c | 65 +++++++++++++++----------
 1 file changed, 38 insertions(+), 27 deletions(-)

On 19.10.2020 14:36, Yang Xu wrote:
> In this test, we only check send()/sendto()/sendmsg() calls
> with MSG_MORE flag whether get EAGAIN/EWOULDBLOCK error immediately.
> 
> For other flag, we just call recv again when meeting EAGAIN/EWOULDBLOCK
> error.
> 
> Also, improve message and make this case more clean when failed.
> 

Hi Yang,

Fixed quoted strings and applied, thanks!

> Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
> ---
>  testcases/kernel/syscalls/send/send02.c | 65 +++++++++++++++----------
>  1 file changed, 38 insertions(+), 27 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/send/send02.c b/testcases/kernel/syscalls/send/send02.c
> index 5630230fa..b2ab3b79c 100644
> --- a/testcases/kernel/syscalls/send/send02.c
> +++ b/testcases/kernel/syscalls/send/send02.c
> @@ -71,32 +71,41 @@ static void setup(void)
>  	memset(sendbuf, 0x42, SENDSIZE);
>  }
>  
> -static int check_recv(int sock, long expsize)
> +static int check_recv(int sock, long expsize, int loop)
>  {
>  	char recvbuf[RECVSIZE] = {0};
>  
> -	TEST(recv(sock, recvbuf, RECVSIZE, MSG_DONTWAIT));
> -
> -	if (TST_RET == -1) {
> -		/* expected error immediately after send(MSG_MORE) */
> -		if (!expsize && (TST_ERR == EAGAIN || TST_ERR == EWOULDBLOCK))
> -			return 1;
> -
> -		/* unexpected error */
> -		tst_res(TFAIL | TTERRNO, "recv() error");
> -		return 0;
> -	}
> -
> -	if (TST_RET < 0) {
> -		tst_res(TFAIL | TTERRNO, "Invalid recv() return value %ld",
> -			TST_RET);
> -		return 0;
> -	}
> -
> -	if (TST_RET != expsize) {
> -		tst_res(TFAIL, "recv() read %ld bytes, expected %ld", TST_RET,
> -			expsize);
> -		return 0;
> +	while (1) {
> +		TEST(recv(sock, recvbuf, RECVSIZE, MSG_DONTWAIT));
> +
> +		if (TST_RET == -1) {
> +			/* expected error immediately after send(MSG_MORE) */
> +			if (TST_ERR == EAGAIN || TST_ERR == EWOULDBLOCK) {
> +				if (expsize)
> +					continue;
> +				else
> +					break;
> +			}
> +
> +			/* unexpected error */
> +			tst_res(TFAIL | TTERRNO, "recv() error at step %d, expsize %ld",
> +				loop, expsize);
> +			return 0;
> +		}
> +
> +		if (TST_RET < 0) {
> +			tst_res(TFAIL | TTERRNO, "Invalid recv() return value %ld"
> +				" at step %d, expsize is %ld",
> +				TST_RET, loop, expsize);
> +			return 0;
> +		}
> +
> +		if (TST_RET != expsize) {
> +			tst_res(TFAIL, "recv() read %ld bytes, expected %ld"
> +				" at step %d ", TST_RET, expsize, loop);
> +			return 0;
> +		}
> +		return 1;
>  	}
>  
>  	return 1;
> @@ -120,6 +129,8 @@ static void run(unsigned int n)
>  	struct test_case *tc = testcase_list + n;
>  	socklen_t len = sizeof(addr);
>  
> +	tst_res(TINFO, "Tesing %s", tc->name);
> +
>  	tst_init_sockaddr_inet_bin(&addr, INADDR_LOOPBACK, 0);
>  	listen_sock = SAFE_SOCKET(tc->domain, tc->type, tc->protocol);
>  	dst_sock = listen_sock;
> @@ -139,19 +150,19 @@ static void run(unsigned int n)
>  			dst_sock = SAFE_ACCEPT(listen_sock, NULL, NULL);
>  
>  		tc->send(sock, sendbuf, SENDSIZE, 0);
> -		ret = check_recv(dst_sock, SENDSIZE);
> +		ret = check_recv(dst_sock, SENDSIZE, i + 1);
>  
>  		if (!ret)
>  			break;
>  
>  		tc->send(sock, sendbuf, SENDSIZE, MSG_MORE);
> -		ret = check_recv(dst_sock, 0);
> +		ret = check_recv(dst_sock, 0, i + 1);
>  
>  		if (!ret)
>  			break;
>  
>  		tc->send(sock, sendbuf, 1, 0);
> -		ret = check_recv(dst_sock, SENDSIZE + 1);
> +		ret = check_recv(dst_sock, SENDSIZE + 1, i + 1);
>  
>  		if (!ret)
>  			break;
> @@ -163,7 +174,7 @@ static void run(unsigned int n)
>  	}
>  
>  	if (ret)
> -		tst_res(TPASS, "%s(MSG_MORE) works correctly", tc->name);
> +		tst_res(TPASS, "MSG_MORE works correctly");
>  
>  	cleanup();
>  	dst_sock = -1;
>