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   close (fd);
 111
 112   if ((st1.st_mode & 0777) != 0644)
 113     {
 114       printf ("openat created mode %04o, not 0644\n", (st1.st_mode & 0777));
 115       return 1;
 116     }
 117
 118   if (fchmodat (dir_fd, "some-file", 0400, 0) != 0)
 119     {
 120       puts ("fchownat failed");
 121       return 1;
 122     }
 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 ((st2.st_mode & 0777) != 0400)
 132     {
 133       puts ("mode change failed");
 134       return 1;
 135     }
 136
 137   if (unlinkat (dir_fd, "some-file", 0) != 0)
 138     {
 139       puts ("unlinkat failed");
 140       return 1;
 141     }
 142
 143   close (dir_fd);
 144
 145   return 0;
 146 }