/* Test 25 -> Checks whether unlink()
* detects the file properly
**/

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <dlfcn.h>

int main()
{
   int fd1 = -1;
   int err;
   void * handle = NULL;
   char buf[4096];
   char new_buf[4096];
   off_t cur=0;
   int i=0;
   int data_read = 0;

    handle = dlopen("/lib/libc.so.6",  RTLD_LAZY);
    if (handle == NULL) {
	fprintf(stderr, "%s", dlerror());
	return -1;
    }
    int (*o_open)(const char *, int) = (int (*)(const char *, int)) dlsym(handle, "open");
    ssize_t (*o_read)(int, void *, size_t) = (ssize_t (*)(int, void *, size_t)) dlsym(handle, "read");
    ssize_t (*o_write)(int, void *, size_t) = (ssize_t (*)(int, void *, size_t)) dlsym(handle, "write");
    off_t (*o_lseek)(int, off_t, int) = (off_t (*)(int, off_t, int)) dlsym(handle, "lseek");
    int (*o_close)(int) = (int (*)(int)) dlsym(handle, "close");


/* Bootstrap the file with libfsprotect.c */
   fd1 = open("file5", O_RDONLY);
   if(fd1 == -1) {
         return -1;
   }
   err = close(fd1);
   if(err == -1)
        return -1;

/* Read few blocks in the file */
   fd1 = open("file5", O_RDONLY);
   if(fd1 == -1) {
         return -1;
   }
   for(i=0; i<5; i++) {
     err = read(fd1, buf, 4096);
     if(err == -1) {
         close(fd1);
         return -1;
     }
   }
   err = close(fd1);
   if(err == -1)
        return -1;

/* Unlink the file */
   err = unlink("file5");
   if(err == -1)
        return -1;

/* Try to open it outside the library */
   fd1 = (*o_open)("file5", O_RDONLY);
   if(fd1 != -1)
         return -1;

/* Try to open it through the library */
   fd1 = open("file5", O_RDONLY);
   if(fd1 != -1) {
         return -1;
   }

   return 0;
}