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 #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-unlinkat.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   close (fd);
 100   puts ("file created");
 101
 102   /* fdopendir takes over the descriptor, make a copy.  */
 103   dupfd = dup (dir_fd);
 104   if (dupfd == -1)
 105     {
 106       puts ("2nd dup failed");
 107       return 1;
 108     }
 109   if (lseek (dupfd, 0, SEEK_SET) != 0)
 110     {
 111       puts ("2nd lseek failed");
 112       return 1;
 113     }
 114
 115   /* The directory should be empty safe the . and .. files.  */
 116   dir = fdopendir (dupfd);
 117   if (dir == NULL)
 118     {
 119       puts ("2nd fdopendir failed");
 120       return 1;
 121     }
 122   bool seen_file = false;
 123   while ((d = readdir64 (dir)) != NULL)
 124     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
 125       {
 126         if (strcmp (d->d_name, "some-file") != 0)
 127           {
 128             printf ("temp directory contains file \"%s\"\n", d->d_name);
 129             return 1;
 130           }
 131
 132         seen_file = true;
 133       }
 134   closedir (dir);
 135
 136   if (!seen_file)
 137     {
 138       puts ("file not created in correct directory");
 139       return 1;
 140     }
 141
 142   /* Remove the file now.  */
 143   if (unlinkat (dir_fd, "some-file", 0) != 0)
 144     {
 145       puts ("unlinkat failed");
 146       return 1;
 147     }
 148
 149   /* We won't need dir_fd anymore after this, so use it.  */
 150   if (lseek (dir_fd, 0, SEEK_SET) != 0)
 151     {
 152       puts ("3rd lseek failed");
 153       return 1;
 154     }
 155
 156   /* The directory should be empty safe the . and .. files.  */
 157   dir = fdopendir (dir_fd);
 158   if (dir == NULL)
 159     {
 160       puts ("3rd fdopendir failed");
 161       return 1;
 162     }
 163   while ((d = readdir64 (dir)) != NULL)
 164     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
 165       {
 166         if (strcmp (d->d_name, "some-file") == 0)
 167           {
 168             puts ("some-file not removed");
 169             return 1;
 170           }
 171         else
 172           {
 173             printf ("temp directory contains file \"%s\"\n", d->d_name);
 174             return 1;
 175           }
 176       }
 177   closedir (dir);
 178
 179   return 0;
 180 }