condwait_wrap.c

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <pthread.h>

static int (*condwait_internal_225)(pthread_cond_t *cond,
				    pthread_mutex_t *mutex);

static int (*condwait_internal_232)(pthread_cond_t *cond,
				    pthread_mutex_t *mutex);

void __attribute__ ((constructor)) init(void);

/* Library constructor */
void
init(void)
{

	condwait_internal_225 = dlvsym(RTLD_NEXT, "pthread_cond_wait", "GLIBC_2.2.5");
	condwait_internal_232 = dlvsym(RTLD_NEXT, "pthread_cond_wait", "GLIBC_2.3.2");
}

int
pthread_cond_wait_225(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
	int ret;

	printf("Calling condwait v. 2.2.5 with cond: %p, mutex: %p...",
	       cond, mutex);
	fflush(stdout);
	ret = condwait_internal_225(cond, mutex);
	printf("..got it!\n");

	return ret;
}


int
pthread_cond_wait_232(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
	int ret;

	printf("Calling condwait v. 2.3.2 with cond: %p, mutex: %p...",
	       cond, mutex);
	fflush(stdout);
	ret = condwait_internal_232(cond, mutex);
	printf("..got it!\n");

	return ret;
}

__asm__(".symver pthread_cond_wait_225, pthread_cond_wait@GLIBC_2.2.5");
__asm__(".symver pthread_cond_wait_232, pthread_cond_wait@@GLIBC_2.3.2");