io/tst-fchmodat.c

   1 /* Test for fchmodat function.  */
   2
   3 #include <dirent.h>
   4 #include <fcntl.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9
  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-fchmodat.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 save 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   umask (022);
  86
  87   /* Try to create a file.  */
  88   int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
  89   if (fd == -1)
  90     {
  91       if (errno == ENOSYS)
  92         {
  93           puts ("*at functions not supported");
  94           return 0;
  95         }
  96
  97       puts ("file creation failed");
  98       return 1;
  99     }
 100   write (fd, "hello", 5);
 101   puts ("file created");
 102
 103   struct stat64 st1;
 104   if (fstat64 (fd, &st1) != 0)
 105     {
 106       puts ("fstat64 failed");
 107       return 1;
 108     }
 109
 110   /* Before closing the file, try using this file descriptor to open
 111      another file.  This must fail.  */
 112   if (fchmodat (fd, "some-file", 0400, 0) != -1)
 113     {
 114       puts ("fchmodat using descriptor for normal file worked");
 115       return 1;
 116     }
 117   if (errno != ENOTDIR)
 118     {
 119       puts ("\
 120 error for fchmodat using descriptor for normal file not ENOTDIR ");
 121       return 1;
 122     }
 123
 124   close (fd);
 125
 126   if ((st1.st_mode & 0777) != 0644)
 127     {
 128       printf ("openat created mode %04o, not 0644\n", (st1.st_mode & 0777));
 129       return 1;
 130     }
 131
 132   if (fchmodat (dir_fd, "some-file", 0400, 0) != 0)
 133     {
 134       puts ("fchownat failed");
 135       return 1;
 136     }
 137
 138   struct stat64 st2;
 139   if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
 140     {
 141       puts ("fstatat64 failed");
 142       return 1;
 143     }
 144
 145   if ((st2.st_mode & 0777) != 0400)
 146     {
 147       puts ("mode change failed");
 148       return 1;
 149     }
 150
 151   if (unlinkat (dir_fd, "some-file", 0) != 0)
 152     {
 153       puts ("unlinkat failed");
 154       return 1;
 155     }
 156
 157   /* Create a file descriptor which is closed again right away.  */
 158   int dir_fd2 = dup (dir_fd);
 159   if (dir_fd2 == -1)
 160     {
 161       puts ("dup failed");
 162       return 1;
 163     }
 164   close (dir_fd2);
 165
 166   if (fchmodat (dir_fd2, "some-file", 0400, 0) != -1)
 167     {
 168       puts ("fchmodat using closed descriptor worked");
 169       return 1;
 170     }
 171   if (errno != EBADF)
 172     {
 173       puts ("error for fchmodat using closed descriptor not EBADF ");
 174       return 1;
 175     }
 176
 177   close (dir_fd);
 178
 179   if (fchmodat (-1, "some-file", 0400, 0) != -1)
 180     {
 181       puts ("fchmodat using invalid descriptor worked");
 182       return 1;
 183     }
 184   if (errno != EBADF)
 185     {
 186       puts ("error for fchmodat using invalid descriptor not EBADF ");
 187       return 1;
 188     }
 189
 190   return 0;
 191 }