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annotate tests/test-freopen.c @ 17460:d11431703671

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author Karl Berry <karl@freefriends.org>
date Fri, 09 Aug 2013 08:03:30 -0700
parents 3a09cc104f4c
children
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1 /* Test of opening a file stream.
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2 Copyright (C) 2007-2013 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 Bruno Haible <bruno@clisp.org>, 2007. */
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18
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19 #include <config.h>
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20
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21 #include <stdio.h>
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22
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23 #include "signature.h"
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24 SIGNATURE_CHECK (freopen, FILE *, (char const *, char const *, FILE *));
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25
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26 #include <errno.h>
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27 #include <unistd.h>
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28
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29 #include "macros.h"
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30
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31 int
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32 main ()
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33 {
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34 const char *filename = "test-freopen.txt";
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35
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36 ASSERT (freopen ("/dev/null", "r", stdin) != NULL);
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37
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38 #if 0 /* freopen (NULL, ...) is unsupported on most platforms. */
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39 /* Test that freopen() sets errno if someone else closes the stream
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40 fd behind the back of stdio. */
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41 {
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42 FILE *fp = fopen (filename, "w+");
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43 ASSERT (fp != NULL);
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44 ASSERT (close (fileno (fp)) == 0);
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45 errno = 0;
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46 ASSERT (freopen (NULL, "r", fp) == NULL);
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47 perror("freopen");
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48 ASSERT (errno == EBADF);
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49 fclose (fp);
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50 }
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51
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52 /* Test that freopen() sets errno if the stream was constructed with
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53 an invalid file descriptor. */
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54 {
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55 FILE *fp = fdopen (-1, "w+");
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56 if (fp != NULL)
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57 {
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58 errno = 0;
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59 ASSERT (freopen (NULL, "r", fp) == NULL);
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60 ASSERT (errno == EBADF);
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61 fclose (fp);
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62 }
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63 }
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64 {
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65 FILE *fp;
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66 close (99);
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67 fp = fdopen (99, "w+");
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68 if (fp != NULL)
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69 {
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70 errno = 0;
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71 ASSERT (freopen (NULL, "r", fp) == NULL);
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72 ASSERT (errno == EBADF);
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73 fclose (fp);
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74 }
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75 }
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76 #endif
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77
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78 /* Clean up. */
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79 unlink (filename);
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80
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81 return 0;
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82 }