search for: orig_dlopen

...main nbdkit executable prior to the + * library providing the real dlopen (libdl on Linux, libc on BSD). + */ + +#include <config.h> + +#include <dlfcn.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "internal.h" + +static void *(*orig_dlopen) (const char *filename, int flags); + +/* NULL for normal behavior, or set when we want to override + * relative dlopen()s to instead be an absolute open with prefix. + */ +static char *dir; + +int +nbdkit_set_dlopen_prefix (const char *newdir) +{ + free (dir); + if (newdir) { + dir = strdup (...

I couldn't get this to work in the end. This is the latest non-working version. This email documents what doesn't work for the permanent record. The central problem is that VDDK InitEx() appears to dlopen() various of its own plugins. Although I wasn't able to capture exactly what dlopen() command it is running, the plugins cannot be loaded because they rely on the recompiled

...* loaded in the same namespace; but because it is in a new namespace, + * it cannot use exported nbdkit functions from the main namespace. + */ + +#include <config.h> + +#include <dlfcn.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +static void *(*orig_dlopen) (const char *filename, int flags); + +/* NULL for normal behavior, or set when we want to override + * relative dlopen()s to instead be an absolute open with prefix. + */ +static char *dir; + +int nbdkit_set_dlopen_prefix (const char *newdir) +{ + free (dir); + if (newdir) { + dir = strdup (n...

Differences from v4: Patch 1 is simplified: I realized that since we already use -rdynamic for nbdkit (after all, we WANT our dlopen()d plugins to be able to call our nbdkit_* exports), it is only a matter of adding dlopen to the set of symbols that we export. With that done, there is no separate shared library needed; our dlopen shim is now part of nbdkit proper, and we don't have to tweak

I'm a lot happier with this version: no mucking with dlmopen(). It does add a bit more coupling between nbdkit proper and the vddk plugin (namely, nbdkit now exports a new function that the vddk plugin relies on), but patch 2 adds testsuite coverage of the new function so we shouldn't regress. Patch 1 and 2 are new, patch 3 is unchanged from when Rich posted it in v2, and patch 4 is