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#include <sys/types.h>
#include <dlfcn.h>
#include <error.h>
#include <mcheck.h>
#include <stdlib.h>
#include <unistd.h>
pid_t pid, pid2;
pid_t getpid(void)
{
pid_t (*f)(void);
f = (pid_t (*)(void)) dlsym (RTLD_NEXT, "getpid");
if (f == NULL)
error (EXIT_FAILURE, 0, "dlsym (RTLD_NEXT, \"getpid\"): %s", dlerror ());
return (pid2 = f()) + 26;
}
int
main (void)
{
pid_t (*f)(void);
mtrace ();
f = (pid_t (*)(void)) dlsym (RTLD_DEFAULT, "getpid");
if (f == NULL)
error (EXIT_FAILURE, 0, "dlsym (RTLD_DEFAULT, \"getpid\"): %s", dlerror ());
pid = f();
if (pid != pid2 + 26)
error (EXIT_FAILURE, 0, "main getpid() not called");
return 0;
}
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