Java Web Start (JDK 1.4.2_07) on Linux (Again)

I found a neater way of working around the bug in Sun's javaws
in JDK 1.4.2_07 on a Linux system running kernel 2.6.x and
glibc 2.3.3+ that I referred to in my previous blog entry - I
wrote a wrapper for waitid() that tolerates the
bogus options passed by javawsbin and calls the
real waitid() with saner options. With this code,
I am finally able to run javaws without problems. Note that
this bug seems to have been fixed by Sun in JDK 1.5.0_02.

/* Quick and dirty pre-loaded DSO to make buggy javawsbin
   in JDK 1.4.2_07 work on Linux with kernel 2.6.x and
   glibc 2.3.4.

    Compilation:
     gcc -O2 -fPIC -g0 -shared -o mywait.so mywait.c

    Usage (Bash):
     LD_PRELOAD=/path/to/mywait.so /path/to/javaws <Launcher URL>
   */
#include <dlfcn.h>
#include <sys/wait.h>

 int (*real_waitid)( idtype_t, id_t, siginfo_t *, int);

 int
waitid( idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
  int retVal = -1;

   void *handle = dlopen( "/lib/libc.so.6", RTLD_LAZY);
  real_waitid = dlsym( handle, "waitid");

   options = (options == 0) ? WEXITED : options;
  retVal = (*real_waitid)( idtype, id, infop, options);

   dlclose( handle);

   return retVal;
} /* End pseudo-waitid() */

(Originally posted on Advogato.)

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