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qga/vss-win32: Document the DLL requires non-null errp

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requester.cpp uses this pattern to receive an error and pass it on to
the caller (err_is_set() macro peeled off for clarity):

    ... code that may set errset->errp ...
    if (errset->errp && *errset->errp) {
        ... handle error ...
    }

This breaks when errset->errp is null.  As far as I can tell, it
currently isn't, so this is merely fragile, not actually broken.

The robust way to do this is to receive the error in a local variable,
then propagate it up, like this:

    Error *err = NULL;

    ... code that may set err ...
    if (err)
        ... handle error ...
        error_propagate(errset->errp, err);
    }

See also commit 5e54769, 0f230bf, a903f40.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Markus Armbruster 2015-06-20 09:33:56 +02:00
parent e7cf59e847
commit 08e6464035
3 changed files with 4 additions and 2 deletions
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2
qga/vss-win32/requester.h
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@ -27,7 +27,7 @@ typedef void (*ErrorSetFunc)(struct Error **errp, int win32_err,
const char *fmt, ...) GCC_FMT_ATTR(3, 4);
typedef struct ErrorSet {
ErrorSetFunc error_setg_win32;
struct Error **errp;
struct Error **errp; /* restriction: must not be null */
} ErrorSet;
STDAPI requester_init(void);