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1 /* Implement fopen_unlocked and related functions.
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2 Copyright (C) 2005 Free Software Foundation, Inc.
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3 Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
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4
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5 This file is part of the libiberty library.
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6 Libiberty is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU Library General Public
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8 License as published by the Free Software Foundation; either
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9 version 2 of the License, or (at your option) any later version.
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10
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11 Libiberty is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 Library General Public License for more details.
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15
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16 You should have received a copy of the GNU Library General Public
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17 License along with libiberty; see the file COPYING.LIB. If
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18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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19 Boston, MA 02110-1301, USA. */
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20
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21 /*
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22
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23 @deftypefn Extension void unlock_stream (FILE * @var{stream})
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24
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25 If the OS supports it, ensure that the supplied stream is setup to
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26 avoid any multi-threaded locking. Otherwise leave the @code{FILE}
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27 pointer unchanged. If the @var{stream} is @code{NULL} do nothing.
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28
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29 @end deftypefn
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30
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31 @deftypefn Extension void unlock_std_streams (void)
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32
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33 If the OS supports it, ensure that the standard I/O streams,
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34 @code{stdin}, @code{stdout} and @code{stderr} are setup to avoid any
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35 multi-threaded locking. Otherwise do nothing.
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36
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37 @end deftypefn
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38
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39 @deftypefn Extension {FILE *} fopen_unlocked (const char *@var{path}, const char * @var{mode})
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40
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41 Opens and returns a @code{FILE} pointer via @code{fopen}. If the
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42 operating system supports it, ensure that the stream is setup to avoid
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43 any multi-threaded locking. Otherwise return the @code{FILE} pointer
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44 unchanged.
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45
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46 @end deftypefn
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47
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48 @deftypefn Extension {FILE *} fdopen_unlocked (int @var{fildes}, const char * @var{mode})
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49
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50 Opens and returns a @code{FILE} pointer via @code{fdopen}. If the
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51 operating system supports it, ensure that the stream is setup to avoid
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52 any multi-threaded locking. Otherwise return the @code{FILE} pointer
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53 unchanged.
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54
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55 @end deftypefn
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56
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57 @deftypefn Extension {FILE *} freopen_unlocked (const char * @var{path}, const char * @var{mode}, FILE * @var{stream})
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58
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59 Opens and returns a @code{FILE} pointer via @code{freopen}. If the
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60 operating system supports it, ensure that the stream is setup to avoid
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61 any multi-threaded locking. Otherwise return the @code{FILE} pointer
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62 unchanged.
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63
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64 @end deftypefn
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65
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66 */
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67
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68 #ifdef HAVE_CONFIG_H
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69 #include "config.h"
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70 #endif
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71 #include <stdio.h>
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72 #ifdef HAVE_STDIO_EXT_H
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73 #include <stdio_ext.h>
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74 #endif
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75
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76 #include "libiberty.h"
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77
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78 /* This is an inline helper function to consolidate attempts to unlock
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79 a stream. */
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80
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81 static inline void
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82 unlock_1 (FILE *const fp ATTRIBUTE_UNUSED)
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83 {
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84 #if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)
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85 if (fp)
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86 __fsetlocking (fp, FSETLOCKING_BYCALLER);
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87 #endif
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88 }
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89
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90 void
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91 unlock_stream (FILE *fp)
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92 {
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93 unlock_1 (fp);
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94 }
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95
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96 void
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97 unlock_std_streams (void)
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98 {
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99 unlock_1 (stdin);
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100 unlock_1 (stdout);
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101 unlock_1 (stderr);
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102 }
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103
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104 FILE *
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105 fopen_unlocked (const char *path, const char *mode)
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106 {
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107 FILE *const fp = fopen (path, mode);
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108 unlock_1 (fp);
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109 return fp;
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110 }
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111
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112 FILE *
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113 fdopen_unlocked (int fildes, const char *mode)
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114 {
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115 FILE *const fp = fdopen (fildes, mode);
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116 unlock_1 (fp);
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117 return fp;
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118 }
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119
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120 FILE *
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121 freopen_unlocked (const char *path, const char *mode, FILE *stream)
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122 {
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123 FILE *const fp = freopen (path, mode, stream);
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124 unlock_1 (fp);
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125 return fp;
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126 }
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