// hook --> 

// open


// write


// read


// close

#define _GNU_SOURCE
#include <dlfcn.h>


#include <stdio.h>



typedef int (*open_t)(const char *pathname, int flags);
open_t  open_f = NULL;

typedef ssize_t (*read_t)(int fd, void *buf, size_t count);
read_t read_f = NULL;


typedef ssize_t (*write_t)(int fd, const void *buf, size_t count);
write_t write_f = NULL;

typedef int (*close_t)(int fd);
close_t close_f = NULL;


int open(const char *pathname, int flags) {

	if (open_f == NULL) {
		open_f = dlsym(RTLD_NEXT, "open");
	}

	printf("open .. %s\n", pathname);

	return open_f(pathname, flags);
}

ssize_t read(int fd, void *buf, size_t count) {

	if (read_f == NULL) {
		read_f = dlsym(RTLD_NEXT, "read");
	}

	printf("read ..\n");
	return read_f(fd, buf, count);
}

ssize_t write(int fd, const void *buf, size_t count) {

	if (write_f == NULL) {
		write_f = dlsym(RTLD_NEXT, "write");
	}

	printf("write ..\n");
	return write_f(fd, buf, count);
}

int close(int fd) {
	if (close_f == NULL) {
		close_f = dlsym(RTLD_NEXT, "close");
	}

	printf("close ..\n");
	return close_f(fd);
}