search for: dlopen_pread

...failed as expected: %s\n", msg); + + return 0; +} + +/* These must be provided, but we don't really need to use them. */ +static void * +dlopen_open (int readonly) +{ + return NBDKIT_HANDLE_NOT_NEEDED; +} + +static int64_t +dlopen_get_size (void *handle) +{ + return 0; +} + +static int +dlopen_pread (void *handle, void *buf, uint32_t count, uint64_t offset) +{ + assert (false); +} + +static struct nbdkit_plugin plugin = { + .name = "dlopenplugin", + .version = PACKAGE_VERSION, + .config = dlopen_config, + .config_complete = dlopen_config_compl...

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