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annotate tests/test-pwrite.c @ 40231:9b3c79fdfe0b

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strtod: fix clash with strtold Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817). * lib/strtod.c (compute_minus_zero, minus_zero): Simplify by remving the macro / external variable, and having just a function. User changed. This avoids the need for an external variable that might clash.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 11 Mar 2019 16:40:29 -0700
parents b06060465f09
children
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1 /* Test the pwrite function.
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2 Copyright (C) 2009-2019 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 <https://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 #include <unistd.h>
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20
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21 #include "signature.h"
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22 SIGNATURE_CHECK (pwrite, ssize_t, (int, const void *, size_t, off_t));
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23
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24 #include <sys/types.h>
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25 #include <fcntl.h>
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26 #include <errno.h>
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27 #include <string.h>
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28
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29 #include "macros.h"
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30
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31 #define N (sizeof buf - 1)
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32
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33 int
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34 main (void)
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35 {
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36 char const *file = "out";
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37 int fd;
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38 char buf[] = "0123456789";
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39 off_t pos = 2;
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40 size_t i;
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41 off_t init_pos;
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42
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43 ASSERT (file);
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44
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45 fd = open (file, O_CREAT | O_WRONLY, 0600);
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46 ASSERT (0 <= fd);
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47 ASSERT (write (fd, buf, N) == N);
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48 ASSERT (close (fd) == 0);
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49
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50 fd = open (file, O_WRONLY, 0600);
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51 ASSERT (0 <= fd);
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52
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53 init_pos = lseek (fd, pos, SEEK_SET);
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54 ASSERT (init_pos == pos);
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55
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56 for (i = 0; i < N; i+=2)
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57 {
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58 const char byte = 'W';
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59 ASSERT (pwrite (fd, &byte, 1, i) == 1);
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60 ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
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61 }
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62
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63 {
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64 /* Invalid offset must evoke failure with EINVAL. */
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65 const char byte = 'b';
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66 ASSERT (pwrite (fd, &byte, 1, (off_t) -1) == -1);
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67 ASSERT (errno == EINVAL);
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68 }
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69
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70 ASSERT (close (fd) == 0);
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71
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72 {
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73 fd = open (file, O_RDONLY);
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74 ASSERT (0 <= fd);
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75 ASSERT (read (fd, buf, N) == N);
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76 ASSERT (close (fd) == 0);
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77 ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);
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78 }
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79
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80 /* Test behaviour for invalid file descriptors. */
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81 {
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82 char byte = 'x';
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83 errno = 0;
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84 ASSERT (pwrite (-1, &byte, 1, 0) == -1);
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85 ASSERT (errno == EBADF);
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86 }
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87 {
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88 char byte = 'x';
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89 close (99);
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90 errno = 0;
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91 ASSERT (pwrite (99, &byte, 1, 0) == -1);
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92 ASSERT (errno == EBADF);
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93 }
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94
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95 return 0;
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96 }