#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <dlfcn.h>

int (*real_recv)(int, void *, size_t, int) = NULL;

int recv(int s, void *buf, size_t len, int flags)
{
	int ret;

	if (!real_recv)
		real_recv = dlsym(RTLD_NEXT, "recv");
	
	if (!real_recv) {
		fprintf(stderr, "!!! Could not resolve 'recv'!\n");
		errno = ENOSYS;
		return -1;
	}
	if ((ret = real_recv(s, buf, len, flags)) == -1 && errno == EAGAIN)
		errno = EINPROGRESS;

	return ret;
}