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 #include <sys/stat.h>
   8
   9 #include <support/xunistd.h>
  10
  11 static void prepare (void);
  12 #define PREPARE(argc, argv) prepare ()
  13
  14 static int do_test (void);
  15 #define TEST_FUNCTION do_test ()
  16
  17 #include "../test-skeleton.c"
  18
  19 static int dir_fd;
  20
  21 static void
  22 prepare (void)
  23 {
  24   size_t test_dir_len = strlen (test_dir);
  25   static const char dir_name[] = "/tst-fstatat.XXXXXX";
  26
  27   size_t dirbuflen = test_dir_len + sizeof (dir_name);
  28   char *dirbuf = malloc (dirbuflen);
  29   if (dirbuf == NULL)
  30     {
  31       puts ("out of memory");
  32       exit (1);
  33     }
  34
  35   snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
  36   if (mkdtemp (dirbuf) == NULL)
  37     {
  38       puts ("cannot create temporary directory");
  39       exit (1);
  40     }
  41
  42   add_temp_file (dirbuf);
  43
  44   dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
  45   if (dir_fd == -1)
  46     {
  47       puts ("cannot open directory");
  48       exit (1);
  49     }
  50 }
  51
  52
  53 static int
  54 do_test (void)
  55 {
  56   /* fdopendir takes over the descriptor, make a copy.  */
  57   int dupfd = dup (dir_fd);
  58   if (dupfd == -1)
  59     {
  60       puts ("dup failed");
  61       return 1;
  62     }
  63   if (lseek (dupfd, 0, SEEK_SET) != 0)
  64     {
  65       puts ("1st lseek failed");
  66       return 1;
  67     }
  68
  69   /* The directory should be empty safe the . and .. files.  */
  70   DIR *dir = fdopendir (dupfd);
  71   if (dir == NULL)
  72     {
  73       puts ("fdopendir failed");
  74       return 1;
  75     }
  76   struct dirent64 *d;
  77   while ((d = readdir64 (dir)) != NULL)
  78     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
  79       {
  80         printf ("temp directory contains file \"%s\"\n", d->d_name);
  81         return 1;
  82       }
  83   closedir (dir);
  84
  85   /* Try to create a file.  */
  86   int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
  87   if (fd == -1)
  88     {
  89       if (errno == ENOSYS)
  90         {
  91           puts ("*at functions not supported");
  92           return 0;
  93         }
  94
  95       puts ("file creation failed");
  96       return 1;
  97     }
  98   xwrite (fd, "hello", 5);
  99   puts ("file created");
 100
 101   struct stat64 st1;
 102
 103   /* Before closing the file, try using this file descriptor to open
 104      another file.  This must fail.  */
 105   if (fstatat64 (fd, "some-file", &st1, 0) != -1)
 106     {
 107       puts ("fstatatat using descriptor for normal file worked");
 108       return 1;
 109     }
 110   if (errno != ENOTDIR)
 111     {
 112       puts ("error for fstatat using descriptor for normal file not ENOTDIR ");
 113       return 1;
 114     }
 115
 116   if (fstat64 (fd, &st1) != 0)
 117     {
 118       puts ("fstat64 failed");
 119       return 1;
 120     }
 121
 122   close (fd);
 123
 124   struct stat64 st2;
 125   if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
 126     {
 127       puts ("fstatat64 failed");
 128       return 1;
 129     }
 130
 131   if (st1.st_dev != st2.st_dev
 132       || st1.st_ino != st2.st_ino
 133       || st1.st_size != st2.st_size)
 134     {
 135       puts ("stat results do not match");
 136       return 1;
 137     }
 138
 139   if (unlinkat (dir_fd, "some-file", 0) != 0)
 140     {
 141       puts ("unlinkat failed");
 142       return 1;
 143     }
 144
 145   if (fstatat64 (dir_fd, "some-file", &st2, 0) == 0)
 146     {
 147       puts ("second fstatat64 succeeded");
 148       return 1;
 149     }
 150   if (errno != ENOENT)
 151     {
 152       puts ("second fstatat64 did not fail with ENOENT");
 153       return 1;
 154     }
 155
 156   /* Create a file descriptor which is closed again right away.  */
 157   int dir_fd2 = dup (dir_fd);
 158   if (dir_fd2 == -1)
 159     {
 160       puts ("dup failed");
 161       return 1;
 162     }
 163   close (dir_fd2);
 164
 165   if (fstatat64 (dir_fd2, "some-file", &st1, 0) != -1)
 166     {
 167       puts ("fstatat64 using closed descriptor worked");
 168       return 1;
 169     }
 170   if (errno != EBADF)
 171     {
 172       puts ("error for fstatat using closed descriptor not EBADF ");
 173       return 1;
 174     }
 175
 176   close (dir_fd);
 177
 178   if (fstatat64 (-1, "some-file", &st1, 0) != -1)
 179     {
 180       puts ("fstatat64 using invalid descriptor worked");
 181       return 1;
 182     }
 183   if (errno != EBADF)
 184     {
 185       puts ("error for fstatat using invalid descriptor not EBADF ");
 186       return 1;
 187     }
 188
 189   return 0;
 190 }