glibc/dlfcn/moddummy2.c

/* Provide a dummy DSO for tst-rec-dlopen to use.  */
#include <stdio.h>
#include <stdlib.h>

int
dummy2 (void)
{
  printf ("Called dummy2()\n");
  /* If the outer dlopen is not dummy1 (becuase of some error)
     then tst-rec-dlopen will see a value of -1 as the returned
     result and fail.  */
  return -1;
}
Fix recursive dlopen. The ability to recursively call dlopen is useful for malloc implementations that wish to load other dynamic modules that implement reentrant/AS-safe functions to use in their own implementation. Given that a user malloc implementation may be called by an ongoing dlopen to allocate memory the user malloc implementation interrupts dlopen and if it calls dlopen again that's a reentrant call. This patch fixes the issues with the ld.so.cache mapping and the _r_debug assertion which prevent this from working as expected. See: https://sourceware.org/ml/libc-alpha/2014-12/msg00446.html 2015-01-21 06:51:10 +00:00			`/* Provide a dummy DSO for tst-rec-dlopen to use. */`
			`#include <stdio.h>`
			`#include <stdlib.h>`

			`int`
			`dummy2 (void)`
			`{`
			`printf ("Called dummy2()\n");`
			`/* If the outer dlopen is not dummy1 (becuase of some error)`
			`then tst-rec-dlopen will see a value of -1 as the returned`
			`result and fail. */`
			`return -1;`
			`}`