[libvirt] [PATCH v4 5/8] virmock.h: Introduce VIR_MOCK_CALL_STAT

[Roman Bogorodskiy]

  Michal Privoznik wrote:

> There is some magic going on when it comes to stat() or lstat().
> Basically, stat() can either be a regular function, an inline
> function that calls __xstat(_STAT_VER, ...) or a macro that does
> the same as the inline func. Don't ask why is that, just read the
> documentation in sys/stat.h and make sure you have a bucket next
> to you. Anyway, currently there will not be both stat and __xstat
> symbols at the same time, as one of them gets overwritten to the
> other one during compilation. But this is not true anymore once
> we start chaining our mocking libraries. Therefore we need a
> wrapper that calls desired function from glibc.
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
> ---
>  tests/vircgroupmock.c | 14 +++++++-------
>  tests/virmock.h       | 23 +++++++++++++++++++++++
>  tests/virpcimock.c    | 19 +++++++++----------
>  3 files changed, 39 insertions(+), 17 deletions(-)

...

> diff --git a/tests/virmock.h b/tests/virmock.h
> index 62a7c8f..27c03ba 100644
> --- a/tests/virmock.h
> +++ b/tests/virmock.h
> @@ -27,6 +27,7 @@
>  # endif
>  # include <stdlib.h>
>  # include <stdio.h>
> +# include <sys/stat.h>
>  
>  # include "internal.h"
>  
> @@ -254,6 +255,28 @@
>      static void (*real_##name)(void);                                   \
>      void name(void)
>  
> +static inline int
> +callStat(int (*realStat)(const char *, struct stat *),
> +         int (*realXstat)(int, const char *, struct stat *),
> +         int __ver, const char *__filename, struct stat *__stat_buf)
> +{
> +    if (!realXstat) {
> +        if (__ver == _STAT_VER) {
> +            return realStat(__filename, __stat_buf);
> +        } else {
> +            fprintf(stderr, "Not handled __xstat(ver=%d)", __ver);
> +            abort();
> +        }
> +    }
> +
> +    return realXstat(__ver, __filename, __stat_buf);
> +}

Hm, this fails on FreeBSD with:

  CC       nssmock_la-nssmock.lo
In file included from nssmock.c:24:
./virmock.h:264:22: error: use of undeclared identifier '_STAT_VER'
        if (__ver == _STAT_VER) {
                     ^
1 error generated.
Makefile:4932: recipe for target 'nssmock_la-nssmock.lo' failed
gmake: *** [nssmock_la-nssmock.lo] Error 1


Roman Bogorodskiy
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