io/tst-unlinkat.c

   1 #include <dirent.h>
   2 #include <fcntl.h>
   3 #include <stdbool.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.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-unlinkat.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   close (fd);
  99   puts ("file created");
 100
 101   /* fdopendir takes over the descriptor, make a copy.  */
 102   dupfd = dup (dir_fd);
 103   if (dupfd == -1)
 104     {
 105       puts ("2nd dup failed");
 106       return 1;
 107     }
 108   if (lseek (dupfd, 0, SEEK_SET) != 0)
 109     {
 110       puts ("2nd lseek failed");
 111       return 1;
 112     }
 113
 114   /* The directory should be empty safe the . and .. files.  */
 115   dir = fdopendir (dupfd);
 116   if (dir == NULL)
 117     {
 118       puts ("2nd fdopendir failed");
 119       return 1;
 120     }
 121   bool seen_file = false;
 122   while ((d = readdir64 (dir)) != NULL)
 123     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
 124       {
 125         if (strcmp (d->d_name, "some-file") != 0)
 126           {
 127             printf ("temp directory contains file \"%s\"\n", d->d_name);
 128             return 1;
 129           }
 130
 131         seen_file = true;
 132       }
 133   closedir (dir);
 134
 135   if (!seen_file)
 136     {
 137       puts ("file not created in correct directory");
 138       return 1;
 139     }
 140
 141   /* Remove the file now.  */
 142   if (unlinkat (dir_fd, "some-file", 0) != 0)
 143     {
 144       puts ("unlinkat failed");
 145       return 1;
 146     }
 147
 148   /* We won't need dir_fd anymore after this, so use it.  */
 149   if (lseek (dir_fd, 0, SEEK_SET) != 0)
 150     {
 151       puts ("3rd lseek failed");
 152       return 1;
 153     }
 154
 155   /* The directory should be empty safe the . and .. files.  */
 156   dir = fdopendir (dir_fd);
 157   if (dir == NULL)
 158     {
 159       puts ("3rd fdopendir failed");
 160       return 1;
 161     }
 162   while ((d = readdir64 (dir)) != NULL)
 163     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
 164       {
 165         if (strcmp (d->d_name, "some-file") == 0)
 166           {
 167             puts ("some-file not removed");
 168             return 1;
 169           }
 170         else
 171           {
 172             printf ("temp directory contains file \"%s\"\n", d->d_name);
 173             return 1;
 174           }
 175       }
 176   closedir (dir);
 177
 178   return 0;
 179 }