Mercurial > hg > CbC > CbC_gcc
annotate libiberty/fopen_unlocked.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | f6334be47118 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* Implement fopen_unlocked and related functions. |
| 111 | 2 Copyright (C) 2005-2017 Free Software Foundation, Inc. |
| 0 | 3 Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>. |
| 4 | |
| 5 This file is part of the libiberty library. | |
| 6 Libiberty is free software; you can redistribute it and/or | |
| 7 modify it under the terms of the GNU Library General Public | |
| 8 License as published by the Free Software Foundation; either | |
| 9 version 2 of the License, or (at your option) any later version. | |
| 10 | |
| 11 Libiberty is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 Library General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU Library General Public | |
| 17 License along with libiberty; see the file COPYING.LIB. If | |
| 18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, | |
| 19 Boston, MA 02110-1301, USA. */ | |
| 20 | |
| 21 /* | |
| 22 | |
| 23 @deftypefn Extension void unlock_stream (FILE * @var{stream}) | |
| 24 | |
| 25 If the OS supports it, ensure that the supplied stream is setup to | |
| 26 avoid any multi-threaded locking. Otherwise leave the @code{FILE} | |
| 27 pointer unchanged. If the @var{stream} is @code{NULL} do nothing. | |
| 28 | |
| 29 @end deftypefn | |
| 30 | |
| 31 @deftypefn Extension void unlock_std_streams (void) | |
| 32 | |
| 33 If the OS supports it, ensure that the standard I/O streams, | |
| 34 @code{stdin}, @code{stdout} and @code{stderr} are setup to avoid any | |
| 35 multi-threaded locking. Otherwise do nothing. | |
| 36 | |
| 37 @end deftypefn | |
| 38 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
39 @deftypefn Extension {FILE *} fopen_unlocked (const char *@var{path}, @ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
40 const char * @var{mode}) |
| 0 | 41 |
| 42 Opens and returns a @code{FILE} pointer via @code{fopen}. If the | |
| 43 operating system supports it, ensure that the stream is setup to avoid | |
| 44 any multi-threaded locking. Otherwise return the @code{FILE} pointer | |
| 45 unchanged. | |
| 46 | |
| 47 @end deftypefn | |
| 48 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
49 @deftypefn Extension {FILE *} fdopen_unlocked (int @var{fildes}, @ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
50 const char * @var{mode}) |
| 0 | 51 |
| 52 Opens and returns a @code{FILE} pointer via @code{fdopen}. If the | |
| 53 operating system supports it, ensure that the stream is setup to avoid | |
| 54 any multi-threaded locking. Otherwise return the @code{FILE} pointer | |
| 55 unchanged. | |
| 56 | |
| 57 @end deftypefn | |
| 58 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
59 @deftypefn Extension {FILE *} freopen_unlocked (const char * @var{path}, @ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
60 const char * @var{mode}, FILE * @var{stream}) |
| 0 | 61 |
| 62 Opens and returns a @code{FILE} pointer via @code{freopen}. If the | |
| 63 operating system supports it, ensure that the stream is setup to avoid | |
| 64 any multi-threaded locking. Otherwise return the @code{FILE} pointer | |
| 65 unchanged. | |
| 66 | |
| 67 @end deftypefn | |
| 68 | |
| 69 */ | |
| 70 | |
| 71 #ifdef HAVE_CONFIG_H | |
| 72 #include "config.h" | |
| 73 #endif | |
| 74 #include <stdio.h> | |
| 75 #ifdef HAVE_STDIO_EXT_H | |
| 76 #include <stdio_ext.h> | |
| 77 #endif | |
| 78 | |
| 79 #include "libiberty.h" | |
| 80 | |
| 81 /* This is an inline helper function to consolidate attempts to unlock | |
| 82 a stream. */ | |
| 83 | |
| 84 static inline void | |
| 85 unlock_1 (FILE *const fp ATTRIBUTE_UNUSED) | |
| 86 { | |
| 87 #if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER) | |
| 88 if (fp) | |
| 89 __fsetlocking (fp, FSETLOCKING_BYCALLER); | |
| 90 #endif | |
| 91 } | |
| 92 | |
| 93 void | |
| 94 unlock_stream (FILE *fp) | |
| 95 { | |
| 96 unlock_1 (fp); | |
| 97 } | |
| 98 | |
| 99 void | |
| 100 unlock_std_streams (void) | |
| 101 { | |
| 102 unlock_1 (stdin); | |
| 103 unlock_1 (stdout); | |
| 104 unlock_1 (stderr); | |
| 105 } | |
| 106 | |
| 107 FILE * | |
| 108 fopen_unlocked (const char *path, const char *mode) | |
| 109 { | |
| 110 FILE *const fp = fopen (path, mode); | |
| 111 unlock_1 (fp); | |
| 112 return fp; | |
| 113 } | |
| 114 | |
| 115 FILE * | |
| 116 fdopen_unlocked (int fildes, const char *mode) | |
| 117 { | |
| 118 FILE *const fp = fdopen (fildes, mode); | |
| 119 unlock_1 (fp); | |
| 120 return fp; | |
| 121 } | |
| 122 | |
| 123 FILE * | |
| 124 freopen_unlocked (const char *path, const char *mode, FILE *stream) | |
| 125 { | |
| 126 FILE *const fp = freopen (path, mode, stream); | |
| 127 unlock_1 (fp); | |
| 128 return fp; | |
| 129 } |