Tuesday, 31 January 2017

Test cases of dup() for radix tree__alloc_fd

I have written the test case for dup( ).
This is dup( ) functionality test case. The dup( ) use for duplicate the file descriptor.
This test case covers below different scenarios:
* Duplicate file descriptor five times one by one.
* Fill up all file descriptor table and try to duplicate a file descriptor. dup( ) should not be succeeded.
* Give invalid file descriptor to the dup( ). dup( ) should be failed.
* Check inode number after passing newfd and oldfd to fstat( ). inode number should be same.
 Upon successful execution this program will return zero value, otherwise, it will return -1.



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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

int maxfd;

int dup_fd(int count)
{
 int fd[count],i;
 char buf[15];

for(i = 0; i < count; i++)
 {
 sprintf(buf, test/myfile%d, i);
 fd[i] = open(buf, O_CREAT | O_RDWR, 0644); 
 printf(open: %d\n, fd[i]);
 if(fd[i] == -1)
 {
 printf(open() failed\n);
 return -1;
 }
 fd [i+1] = dup(i);
 if (fd [i+1] == -1)
 {
 printf(dup() failed\n);
 return -1;
 }
 printf(dup: %d\n, fd [i+1]);
 }
 
 return 0;
}
void close_fd(int count)
{
 int i;
 for (i = 3; i < count; i++)
 {
 close(i);
 }
}

void unlink_files(int count)
{
 char buf[15];
 int i;

for(i = 0; i < count; i++)
 {
 sprintf(buf,test/myfile%d,i);
 unlink(buf);
 }
}

int max_fd_dup() 
{
 int *fd, i;
 int ret;
 char buf[15];
 maxfd = getdtablesize(); /* get descriptor table size */

 fd = malloc(maxfd * sizeof(int)); /* allocate the memory */

 printf(maxfd = %d\n,maxfd);

 for (i = 0; i < (maxfd-3); i++)
 {
 sprintf(buf, test/myfile%d, i);
 fd[i] = open(buf, O_CREAT | O_RDWR, 0644); 
 if (fd[i] == -1)
 {
 printf(max_fd_dup() :: open() failed\n);
 return -1;
 }
 }
 printf(here *****************\n);
 
 ret = dup(10); /* duplicate the file descriptor */
 
 if(ret == -1)
 printf(max_fd_dup: tc : pass\n);
 else
 printf(max_fd_dup: tc : fail\n);

return 0;
}
int dup_misc_tc()
{
 int *fd, i, maxfd;
 struct stat buf1, buf2;
 char buf[20];
 int ret, oldfd, newfd;

 ret = dup(10);
  if (ret == -1)
  {
  printf(dup_misc_tc1 : pass\n);
  }
  else
  {
  printf(dup_misc_tc1 : fail\n);
  }

 ret = dup(-1);

 if (ret == -1)
  {
  printf(dup_misc_tc2 : pass\n);
  }
 else
  {
  printf(dup_misc_tc2 : fail\n);
  }

 oldfd = open(test/file1, O_CREAT | O_RDWR, 0644);
 if(oldfd == -1)
 {
  printf(dup_misc_tc() : open() failed\n);
  return -1;
 }
 
 newfd = dup(oldfd);
 if(newfd == -1)
 {
  printf(dup_misc_tc() : dup() failed\n);
  return -1;
 }

 ret = fstat(oldfd, &buf1); /* get the file status */
 if(ret == -1)
 {
  printf(dup_misc_tc() : fstat() failed\n);
  return -1;
 }
 ret = fstat(newfd, &buf2);
 if(ret == -1)
 {
  printf(dup_misc_tc() : fstat() failed\n);
  return -1;
 }

 printf(buf1.st_ino = %d\n,buf1.st_ino);
 printf(buf2.st_ino = %d\n,buf2.st_ino);
 if(buf1.st_ino == buf2.st_ino)
  printf(dup_misc_tc3 : pass\n);
 else
  printf(dup_misc_tc3 : fail\n);
 close(oldfd);
 close(newfd);
 unlink(test/file1);
 return 0;
}

int main(int argc, char **argv)
{
 int err = 0;
 char *name;

if(argc < 2)
 {
 printf(usage: %s <tcNum> \n, argv[0]);
 printf(provide options to program as tc1, tc2, tc3 etc\n);
 return -1;
 }
 name = argv[1];

if(strcmp(name, tc1) == 0)
 {

err = dup_fd(5);
 if (err == -1)
 {
 return -1;
 }
 close_fd(10);
 unlink_files(5);
 }
 else if(strcmp(name, tc2) == 0)
 {
  max_fd_dup();
  close_fd(maxfd-3);
  unlink_files(maxfd);
 }
 else if(strcmp(name, tc3) == 0)
 {
  dup_misc_tc();
 }
 else
  printf(Invalid option \n);

return 0;
}

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