Re: [Qemu-devel] [PATCH v2 2/3] tests/libqtest: Allow setting expected exit status

[Thomas Huth <thuth@redhat.com>]

On 03/09/2019 18.22, Yury Kotov wrote:
> Add qtest_set_expected_status function to set expected exit status of
> child process. By default expected exit status is 0.
> 
> Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
> ---
>  tests/libqtest.c | 36 +++++++++++++++++++++---------------
>  tests/libqtest.h |  9 +++++++++
>  2 files changed, 30 insertions(+), 15 deletions(-)
> 
> diff --git a/tests/libqtest.c b/tests/libqtest.c
> index 2713b86cf7..a79d4887ae 100644
> --- a/tests/libqtest.c
> +++ b/tests/libqtest.c
> @@ -43,6 +43,7 @@ struct QTestState
>      int qmp_fd;
>      pid_t qemu_pid;  /* our child QEMU process */
>      int wstatus;
> +    int expected_status;
>      bool big_endian;
>      bool irq_level[MAX_IRQ];
>      GString *rx;
> @@ -113,6 +114,11 @@ bool qtest_probe_child(QTestState *s)
>      return false;
>  }
>  
> +void qtest_set_expected_status(QTestState *s, int status)
> +{
> +    s->expected_status = status;
> +}
> +
>  static void kill_qemu(QTestState *s)
>  {
>      pid_t pid = s->qemu_pid;
> @@ -126,24 +132,23 @@ static void kill_qemu(QTestState *s)
>      }
>  
>      /*
> -     * We expect qemu to exit with status 0; anything else is
> +     * Check whether qemu exited with expected exit status; anything else is
>       * fishy and should be logged with as much detail as possible.
>       */
>      wstatus = s->wstatus;
> -    if (wstatus) {
> -        if (WIFEXITED(wstatus)) {
> -            fprintf(stderr, "%s:%d: kill_qemu() tried to terminate QEMU "
> -                    "process but encountered exit status %d\n",
> -                    __FILE__, __LINE__, WEXITSTATUS(wstatus));
> -        } else if (WIFSIGNALED(wstatus)) {
> -            int sig = WTERMSIG(wstatus);
> -            const char *signame = strsignal(sig) ?: "unknown ???";
> -            const char *dump = WCOREDUMP(wstatus) ? " (core dumped)" : "";
> -
> -            fprintf(stderr, "%s:%d: kill_qemu() detected QEMU death "
> -                    "from signal %d (%s)%s\n",
> -                    __FILE__, __LINE__, sig, signame, dump);
> -        }
> +    if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != s->expected_status) {
> +        fprintf(stderr, "%s:%d: kill_qemu() tried to terminate QEMU "
> +                "process but encountered exit status %d (expected %d)\n",
> +                __FILE__, __LINE__, WEXITSTATUS(wstatus), s->expected_status);
> +        abort();
> +    } else if (WIFSIGNALED(wstatus)) {
> +        int sig = WTERMSIG(wstatus);
> +        const char *signame = strsignal(sig) ?: "unknown ???";
> +        const char *dump = WCOREDUMP(wstatus) ? " (core dumped)" : "";
> +
> +        fprintf(stderr, "%s:%d: kill_qemu() detected QEMU death "
> +                "from signal %d (%s)%s\n",
> +                __FILE__, __LINE__, sig, signame, dump);
>          abort();
>      }
>  }
> @@ -248,6 +253,7 @@ QTestState *qtest_init_without_qmp_handshake(const char *extra_args)
>      g_test_message("starting QEMU: %s", command);
>  
>      s->wstatus = 0;
> +    s->expected_status = 0;
>      s->qemu_pid = fork();
>      if (s->qemu_pid == 0) {
>          setenv("QEMU_AUDIO_DRV", "none", true);
> diff --git a/tests/libqtest.h b/tests/libqtest.h
> index 07ea35867c..c00bca94af 100644
> --- a/tests/libqtest.h
> +++ b/tests/libqtest.h
> @@ -997,4 +997,13 @@ void qmp_assert_error_class(QDict *rsp, const char *class);
>   */
>  bool qtest_probe_child(QTestState *s);
>  
> +/**
> + * qtest_set_expected_status:
> + * @s: QTestState instance to operate on.
> + * @status: an expected exit status.
> + *
> + * Set expected exit status of the child.
> + */
> +void qtest_set_expected_status(QTestState *s, int status);
> +
>  #endif
> 

Acked-by: Thomas Huth <thuth@redhat.com>