io/tst-fstatat.c

   1 #include <dirent.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8
   9 static void prepare (void);
  10 #define PREPARE(argc, argv) prepare ()
  11
  12 static int do_test (void);
  13 #define TEST_FUNCTION do_test ()
  14
  15 #include "../test-skeleton.c"
  16
  17 static int dir_fd;
  18
  19 static void
  20 prepare (void)
  21 {
  22   size_t test_dir_len = strlen (test_dir);
  23   static const char dir_name[] = "/tst-fstatat.XXXXXX";
  24
  25   size_t dirbuflen = test_dir_len + sizeof (dir_name);
  26   char *dirbuf = malloc (dirbuflen);
  27   if (dirbuf == NULL)
  28     {
  29       puts ("out of memory");
  30       exit (1);
  31     }
  32
  33   snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
  34   if (mkdtemp (dirbuf) == NULL)
  35     {
  36       puts ("cannot create temporary directory");
  37       exit (1);
  38     }
  39
  40   add_temp_file (dirbuf);
  41
  42   dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
  43   if (dir_fd == -1)
  44     {
  45       puts ("cannot open directory");
  46       exit (1);
  47     }
  48 }
  49
  50
  51 static int
  52 do_test (void)
  53 {
  54   /* fdopendir takes over the descriptor, make a copy.  */
  55   int dupfd = dup (dir_fd);
  56   if (dupfd == -1)
  57     {
  58       puts ("dup failed");
  59       return 1;
  60     }
  61   if (lseek (dupfd, 0, SEEK_SET) != 0)
  62     {
  63       puts ("1st lseek failed");
  64       return 1;
  65     }
  66
  67   /* The directory should be empty safe the . and .. files.  */
  68   DIR *dir = fdopendir (dupfd);
  69   if (dir == NULL)
  70     {
  71       puts ("fdopendir failed");
  72       return 1;
  73     }
  74   struct dirent64 *d;
  75   while ((d = readdir64 (dir)) != NULL)
  76     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
  77       {
  78         printf ("temp directory contains file \"%s\"\n", d->d_name);
  79         return 1;
  80       }
  81   closedir (dir);
  82
  83   /* Try to create a file.  */
  84   int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
  85   if (fd == -1)
  86     {
  87       if (errno == ENOSYS)
  88         {
  89           puts ("*at functions not supported");
  90           return 0;
  91         }
  92
  93       puts ("file creation failed");
  94       return 1;
  95     }
  96   write (fd, "hello", 5);
  97   puts ("file created");
  98
  99   struct stat64 st1;
 100
 101   /* Before closing the file, try using this file descriptor to open
 102      another file.  This must fail.  */
 103   if (fstatat64 (fd, "some-file", &st1, 0) != -1)
 104     {
 105       puts ("fstatatat using descriptor for normal file worked");
 106       return 1;
 107     }
 108   if (errno != ENOTDIR)
 109     {
 110       puts ("error for fstatat using descriptor for normal file not ENOTDIR ");
 111       return 1;
 112     }
 113
 114   if (fstat64 (fd, &st1) != 0)
 115     {
 116       puts ("fstat64 failed");
 117       return 1;
 118     }
 119
 120   close (fd);
 121
 122   struct stat64 st2;
 123   if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
 124     {
 125       puts ("fstatat64 failed");
 126       return 1;
 127     }
 128
 129   if (st1.st_dev != st2.st_dev
 130       || st1.st_ino != st2.st_ino
 131       || st1.st_size != st2.st_size)
 132     {
 133       puts ("stat results do not match");
 134       return 1;
 135     }
 136
 137   if (unlinkat (dir_fd, "some-file", 0) != 0)
 138     {
 139       puts ("unlinkat failed");
 140       return 1;
 141     }
 142
 143   if (fstatat64 (dir_fd, "some-file", &st2, 0) == 0)
 144     {
 145       puts ("second fstatat64 succeeded");
 146       return 1;
 147     }
 148   if (errno != ENOENT)
 149     {
 150       puts ("second fstatat64 did not fail with ENOENT");
 151       return 1;
 152     }
 153
 154   /* Create a file descriptor which is closed again right away.  */
 155   int dir_fd2 = dup (dir_fd);
 156   if (dir_fd2 == -1)
 157     {
 158       puts ("dup failed");
 159       return 1;
 160     }
 161   close (dir_fd2);
 162
 163   if (fstatat64 (dir_fd2, "some-file", &st1, 0) != -1)
 164     {
 165       puts ("fstatat64 using closed descriptor worked");
 166       return 1;
 167     }
 168   if (errno != EBADF)
 169     {
 170       puts ("error for fstatat using closed descriptor not EBADF ");
 171       return 1;
 172     }
 173
 174   close (dir_fd);
 175
 176   if (fstatat64 (-1, "some-file", &st1, 0) != -1)
 177     {
 178       puts ("fstatat64 using invalid descriptor worked");
 179       return 1;
 180     }
 181   if (errno != EBADF)
 182     {
 183       puts ("error for fstatat using invalid descriptor not EBADF ");
 184       return 1;
 185     }
 186
 187   return 0;
 188 }