/*   
 * Copyright (c) 2002, Intel Corporation. All rights reserved.
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this 
 * source tree.
 *
 * The munmap( ) function shall remove any mappings for those 
 * entire pages containing any part of the address space of 
 * the process starting at addr and continuing for len bytes. 
 * Further references to these pages shall result in the 
 * generation of a SIGSEGV signal to the process. 
 *
 * Test Step:
 * 1. map a file into memory;
 * 2. unmap;
 * 3. Try to reference the unmapped memory, test whether SIGSEGV 
 *    is triggered.
 */

#define _XOPEN_SOURCE 600

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "posixtest.h"
 
#define TNAME "munmap/1-2.c"

void sigsegv_handler(int signum)
{
	printf ("Got SIGSEGV\n");
	printf ("Test PASSED\n");
  exit(PTS_PASS);
}

int main()
{
  char tmpfname[256];
  long file_size; 

  void *pa = NULL; 
  void *addr = NULL;
  size_t len;
  int flag;
  int fd;
  off_t off = 0;
  int prot;

  int page_size;
  
  char *ch;
 
  struct sigaction sa;

  sigfillset(&sa.sa_mask);
  sa.sa_handler = sigsegv_handler;
  sigaction(SIGSEGV, &sa, NULL);  
 
  page_size = sysconf(_SC_PAGE_SIZE);
  file_size = 2 * page_size;
  
  /* We hope to map 2 pages */
  len = page_size + 1;
  
  /* Create tmp file */
  snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_munmap_1_1_%d",
           getpid());
  unlink(tmpfname);
  fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL,
            S_IRUSR | S_IWUSR);
  if (fd == -1)
  {  
    printf(TNAME " Error at open(): %s\n", 
           strerror(errno));    
    exit(PTS_UNRESOLVED);
  }
  unlink(tmpfname);
 
  if (ftruncate (fd, file_size) == -1)
  {
    printf("Error at ftruncate: %s\n", strerror(errno));
    exit(PTS_UNRESOLVED);
  } 
  
  flag = MAP_SHARED;
  prot = PROT_READ | PROT_WRITE;
  pa = mmap(addr, len, prot, flag, fd, off);
  if (pa == MAP_FAILED)
  {
  	printf ("Test UNRESOLVED: " TNAME " Error at mmap: %s\n", 
            strerror(errno));    
    exit(PTS_UNRESOLVED);
  }
  
  ch = pa;
  *ch = 'b';
  
  close (fd);
  munmap (pa, len);

  /* Should trigger SIGSEGV here */ 
  *ch = 'a';
    
  printf ("Test FAILED: Did not trigger SIGSEGV\n");
  return PTS_FAIL;
}