glibc/elf/nextmod1.c

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#include <dlfcn.h>
int nextmod1_dummy_var;
int
successful_rtld_next_test (void)
{
int (*fp) (void);
/* Get the next function... */
fp = (int (*) (void)) dlsym (RTLD_NEXT, __FUNCTION__);
/* ...and simply call it. */
return fp ();
}
void *
failing_rtld_next_use (void)
{
void *ret = dlsym (RTLD_NEXT, __FUNCTION__);
/* Ensure we are not tail call optimized, because then RTLD_NEXT
might return this function. */
++nextmod1_dummy_var;
return ret;
}