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  1. JDK
  2. JDK-8156020

8145547 breaks AIX and and uses RTLD_NOLOAD incorrectly

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: client-libs
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b118

      Description

      Change 8145547 uses the RTLD_NOLOAD flag when calling dlopen to probe the availability of the GTK libraries.

      But unfortunately RTLD_NOLOAD is not Posix and for example not available on AIX and BSD.

      I also found out, that the implementation of 8145547 contains a bug. It uses RTLD_NOLOAD in an incorrect way. The man page for dlopen clearly states that one of the two flags RTLD_LAZY or RTLD_NOW has to be included in the flags. But the current implementation uses RTLD_NOLOAD as single flag. Therefor the call to dlopen() currently always returns NULL, no difference if the corresponding library has been loaded already or not.

      The following short C program demonstrates the problem:

      #include <dlfcn.h>
      #include <stdio.h>

      int main(int argc, char **argv) {

        void* l = dlopen("libgtk-x11-2.0.so.0", RTLD_LAZY | RTLD_LOCAL);
        fprintf(stderr, "l = %p\n", l);

        dlerror();
        l = dlopen("libgtk-x11-2.0.so.0", RTLD_NOLOAD);
        fprintf(stderr, "l = %p (error = %s)\n", l, dlerror());

        l = dlopen("libgtk-x11-2.0.so.0", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
        fprintf(stderr, "l = %p\n", l);

      }

      It will print:

      l = 0x10033f81c50
      l = (nil) (error = libgtk-x11-2.0.so.0: invalid mode for dlopen(): Invalid argument)
      l = 0x10033f81c50

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              • Assignee:
                simonis Volker Simonis
                Reporter:
                simonis Volker Simonis
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                Dates

                • Created:
                  Updated:
                  Resolved: