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glibc  2.9
tst-linkat.c
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00001 #include <dirent.h>
00002 #include <fcntl.h>
00003 #include <stdio.h>
00004 #include <stdlib.h>
00005 #include <string.h>
00006 #include <unistd.h>
00007 
00008 
00009 static void prepare (void);
00010 #define PREPARE(argc, argv) prepare ()
00011 
00012 static int do_test (void);
00013 #define TEST_FUNCTION do_test ()
00014 
00015 #include "../test-skeleton.c"
00016 
00017 static int dir_fd;
00018 
00019 static void
00020 prepare (void)
00021 {
00022   size_t test_dir_len = strlen (test_dir);
00023   static const char dir_name[] = "/tst-linkat.XXXXXX";
00024 
00025   size_t dirbuflen = test_dir_len + sizeof (dir_name);
00026   char *dirbuf = malloc (dirbuflen);
00027   if (dirbuf == NULL)
00028     {
00029       puts ("out of memory");
00030       exit (1);
00031     }
00032 
00033   snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
00034   if (mkdtemp (dirbuf) == NULL)
00035     {
00036       puts ("cannot create temporary directory");
00037       exit (1);
00038     }
00039 
00040   add_temp_file (dirbuf);
00041 
00042   dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
00043   if (dir_fd == -1)
00044     {
00045       puts ("cannot open directory");
00046       exit (1);
00047     }
00048 }
00049 
00050 
00051 static int
00052 do_test (void)
00053 {
00054   /* fdopendir takes over the descriptor, make a copy.  */
00055   int dupfd = dup (dir_fd);
00056   if (dupfd == -1)
00057     {
00058       puts ("dup failed");
00059       return 1;
00060     }
00061   if (lseek (dupfd, 0, SEEK_SET) != 0)
00062     {
00063       puts ("1st lseek failed");
00064       return 1;
00065     }
00066 
00067   /* The directory should be empty safe the . and .. files.  */
00068   DIR *dir = fdopendir (dupfd);
00069   if (dir == NULL)
00070     {
00071       puts ("fdopendir failed");
00072       return 1;
00073     }
00074   struct dirent64 *d;
00075   while ((d = readdir64 (dir)) != NULL)
00076     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
00077       {
00078        printf ("temp directory contains file \"%s\"\n", d->d_name);
00079        return 1;
00080       }
00081   closedir (dir);
00082 
00083   /* Try to create a file.  */
00084   int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
00085   if (fd == -1)
00086     {
00087       if (errno == ENOSYS)
00088        {
00089          puts ("*at functions not supported");
00090          return 0;
00091        }
00092 
00093       puts ("file creation failed");
00094       return 1;
00095     }
00096   write (fd, "hello", 5);
00097   puts ("file created");
00098 
00099   struct stat64 st1;
00100   if (fstat64 (fd, &st1) != 0)
00101     {
00102       puts ("fstat64 failed");
00103       return 1;
00104     }
00105 
00106   close (fd);
00107 
00108   if (linkat (dir_fd, "some-file", dir_fd, "another-file", 0) != 0)
00109     {
00110       puts ("symlinkat failed");
00111       return 1;
00112     }
00113 
00114   struct stat64 st2;
00115   if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
00116     {
00117       puts ("fstatat64 failed");
00118       return 1;
00119     }
00120   if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
00121     {
00122       puts ("file changed after symlinkat");
00123       return 1;
00124     }
00125 
00126   if (fstatat64 (dir_fd, "another-file", &st2, AT_SYMLINK_NOFOLLOW) != 0)
00127     {
00128       puts ("2nd fstatat64 failed");
00129       return 1;
00130     }
00131   if (S_ISLNK (st2.st_mode))
00132     {
00133       puts ("2nd fstatat64 shows file is a symlink");
00134       return 1;
00135     }
00136   if (st1.st_dev != st2.st_dev
00137       || st1.st_ino != st2.st_ino
00138       || st1.st_size != st2.st_size)
00139     {
00140       puts ("stat results for linked file do not match");
00141       return 1;
00142     }
00143 
00144   if (fstatat64 (dir_fd, "another-file", &st2, 0) != 0)
00145     {
00146       puts ("3rd fstatat64 failed");
00147       return 1;
00148     }
00149   if (st1.st_dev != st2.st_dev
00150       || st1.st_ino != st2.st_ino
00151       || st1.st_size != st2.st_size)
00152     {
00153       puts ("stat results do not match");
00154       return 1;
00155     }
00156 
00157   if (unlinkat (dir_fd, "another-file", 0) != 0)
00158     {
00159       puts ("unlinkat failed");
00160       return 1;
00161     }
00162   if (unlinkat (dir_fd, "some-file", 0) != 0)
00163     {
00164       puts ("2nd unlinkat failed");
00165       return 1;
00166     }
00167 
00168   close (dir_fd);
00169 
00170   return 0;
00171 }