Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/tmpfile.c @ 9928:9a02133ad731
Add tentative support for Linux libc5.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 17 Apr 2008 02:01:23 +0200 |
| parents | bbbbbf4cd1c5 |
| children | d741ba7b3804 |
| rev | line source |
|---|---|
| 8162 | 1 /* Create a temporary file. |
| 2 Copyright (C) 2007 Free Software Foundation, Inc. | |
| 3 | |
|
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bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8162
diff
changeset
|
4 This program is free software: you can redistribute it and/or modify |
| 8162 | 5 it under the terms of the GNU General Public License as published by |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8162
diff
changeset
|
6 the Free Software Foundation; either version 3 of the License, or |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8162
diff
changeset
|
7 (at your option) any later version. |
| 8162 | 8 |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8162
diff
changeset
|
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 8162 | 16 |
| 17 /* Written by Ben Pfaff. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 /* Specification. */ | |
| 22 #include <stdio.h> | |
| 23 | |
| 24 /* This replacement is used only on native Windows platforms. */ | |
| 25 | |
| 26 #include <errno.h> | |
| 27 #include <fcntl.h> | |
| 28 #include <string.h> | |
| 29 #include <sys/stat.h> | |
| 30 | |
| 31 #include <io.h> | |
| 32 | |
| 33 #define WIN32_LEAN_AND_MEAN /* avoid including junk */ | |
| 34 #include <windows.h> | |
| 35 | |
| 36 #include "pathmax.h" | |
| 37 #include "tempname.h" | |
| 38 #include "tmpdir.h" | |
| 39 | |
| 40 /* On Windows, opening a file with _O_TEMPORARY has the effect of passing | |
| 41 the FILE_FLAG_DELETE_ON_CLOSE flag to CreateFile(), which has the effect | |
| 42 of deleting the file when it is closed - even when the program crashes. | |
| 43 But (according to the Cygwin sources) it works only on Windows NT or newer. | |
| 44 So we cache the info whether we are running on Windows NT or newer. */ | |
| 45 | |
| 46 static bool | |
| 47 supports_delete_on_close () | |
| 48 { | |
| 49 static int known; /* 1 = yes, -1 = no, 0 = unknown */ | |
| 50 if (!known) | |
| 51 { | |
| 52 OSVERSIONINFO v; | |
| 53 | |
| 54 if (GetVersionEx (&v)) | |
| 55 known = (v.dwPlatformId == VER_PLATFORM_WIN32_NT ? 1 : -1); | |
| 56 else | |
| 57 known = -1; | |
| 58 } | |
| 59 return (known > 0); | |
| 60 } | |
| 61 | |
| 62 FILE * | |
| 63 tmpfile (void) | |
| 64 { | |
| 65 char dir[PATH_MAX]; | |
| 66 DWORD retval; | |
| 67 | |
| 68 /* Find Windows temporary file directory. | |
| 69 We provide this as the directory argument to path_search because Windows | |
| 70 defines P_tmpdir to "\\" and will therefore try to put all temporary files | |
| 71 in the root directory (unless $TMPDIR is set). */ | |
| 72 retval = GetTempPath (PATH_MAX, dir); | |
| 73 if (retval > 0 && retval < PATH_MAX) | |
| 74 { | |
| 75 char xtemplate[PATH_MAX]; | |
| 76 | |
| 77 if (path_search (xtemplate, PATH_MAX, dir, NULL, true) >= 0) | |
| 78 { | |
| 79 size_t len = strlen (xtemplate); | |
| 80 int o_temporary = (supports_delete_on_close () ? _O_TEMPORARY : 0); | |
| 81 int fd; | |
| 82 | |
| 83 do | |
| 84 { | |
| 85 memcpy (&xtemplate[len - 6], "XXXXXX", 6); | |
| 86 if (gen_tempname (xtemplate, GT_NOCREATE) < 0) | |
| 87 { | |
| 88 fd = -1; | |
| 89 break; | |
| 90 } | |
| 91 | |
| 92 fd = _open (xtemplate, | |
| 93 _O_CREAT | _O_EXCL | o_temporary | |
| 94 | _O_RDWR | _O_BINARY, | |
| 95 _S_IREAD | _S_IWRITE); | |
| 96 } | |
| 97 while (fd < 0 && errno == EEXIST); | |
| 98 | |
| 99 if (fd >= 0) | |
| 100 { | |
| 101 FILE *fp = _fdopen (fd, "w+b"); | |
| 102 | |
| 103 if (fp != NULL) | |
| 104 return fp; | |
| 105 else | |
| 106 { | |
| 107 int saved_errno = errno; | |
| 108 _close (fd); | |
| 109 errno = saved_errno; | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 } | |
| 114 else | |
| 115 { | |
| 116 if (retval > 0) | |
| 117 errno = ENAMETOOLONG; | |
| 118 else | |
| 119 /* Ideally this should translate GetLastError () to an errno value. */ | |
| 120 errno = ENOENT; | |
| 121 } | |
| 122 | |
| 123 return NULL; | |
| 124 } |