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11936
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1 /* Test that directory streams leave standard fds alone. |
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2 Copyright (C) 2009 Free Software Foundation, Inc. |
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3 |
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4 This program is free software: you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 3 of the License, or |
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7 (at your option) any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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16 |
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17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */ |
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18 |
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19 #include <config.h> |
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20 |
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21 #include "dirent--.h" |
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22 |
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23 #include <errno.h> |
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24 #include <fcntl.h> |
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25 #include <stdio.h> |
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26 #include <stdlib.h> |
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27 #include <unistd.h> |
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28 |
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29 #include "unistd-safer.h" |
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30 |
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31 /* This test intentionally closes stderr. So, we arrange to have fd 10 |
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32 (outside the range of interesting fd's during the test) set up to |
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33 duplicate the original stderr. */ |
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34 |
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35 #define BACKUP_STDERR_FILENO 10 |
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36 static FILE *myerr; |
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37 |
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38 #define ASSERT(expr) \ |
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39 do \ |
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40 { \ |
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41 if (!(expr)) \ |
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42 { \ |
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43 fprintf (myerr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \ |
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44 fflush (myerr); \ |
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45 abort (); \ |
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46 } \ |
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47 } \ |
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48 while (0) |
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49 |
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50 int |
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51 main () |
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52 { |
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53 int i; |
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54 DIR *dp; |
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55 /* The dirent-safer module works without the use of fdopendir (which |
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56 would also pull in fchdir and openat); but if those modules were |
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57 also used, we ensure that they are safe. In particular, the |
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58 gnulib version of fdopendir is unable to guarantee that |
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59 dirfd(fdopendir(fd))==fd, but we can at least guarantee that if |
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60 they are not equal, the fd returned by dirfd is safe. */ |
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61 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR |
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62 int dfd; |
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63 #endif |
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64 |
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65 /* We close fd 2 later, so save it in fd 10. */ |
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66 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO |
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67 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL) |
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68 return 2; |
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69 |
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70 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR |
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71 dfd = open (".", O_RDONLY); |
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72 ASSERT (STDERR_FILENO < dfd); |
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73 #endif |
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74 |
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75 /* Four iterations, with progressively more standard descriptors |
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76 closed. */ |
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77 for (i = -1; i <= STDERR_FILENO; i++) |
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78 { |
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79 if (0 <= i) |
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80 ASSERT (close (i) == 0); |
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81 dp = opendir ("."); |
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82 ASSERT (dp); |
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83 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp)); |
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84 ASSERT (closedir (dp) == 0); |
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85 |
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86 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR |
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87 { |
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88 int fd = dup_safer (dfd); |
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89 ASSERT (STDERR_FILENO < fd); |
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90 dp = fdopendir (fd); |
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91 ASSERT (dp); |
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92 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp)); |
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93 ASSERT (closedir (dp) == 0); |
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94 errno = 0; |
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95 ASSERT (close (fd) == -1); |
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96 ASSERT (errno == EBADF); |
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97 } |
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98 #endif |
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99 } |
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100 |
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101 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR |
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102 ASSERT (close (dfd) == 0); |
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103 #endif |
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104 |
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105 return 0; |
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106 } |
