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