1 /* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; version 2 of the License.
6
7 This program is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11
12 You should have received a copy of the GNU General Public License
13 along with this program; if not, write to the Free Software
14 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
15
16 /* Open a temporary file and cache it with io_cache. Delete it on close */
17
18 #include "mysys_priv.h"
19 #include <m_string.h>
20 #include "my_static.h"
21 #include "mysys_err.h"
22
23 /**
24 Open tempfile cached by IO_CACHE
25
26 Should be used when no seeks are done (only reinit_io_buff)
27 Return 0 if cache is inited ok
28 The actual file is created when the IO_CACHE buffer gets filled
29 If dir is not given, use TMPDIR.
30 */
open_cached_file(IO_CACHE * cache,const char * dir,const char * prefix,size_t cache_size,myf cache_myflags)31 my_bool open_cached_file(IO_CACHE *cache, const char* dir, const char *prefix,
32 size_t cache_size, myf cache_myflags)
33 {
34 DBUG_ENTER("open_cached_file");
35 cache->dir= dir;
36 if (prefix)
37 {
38 DBUG_ASSERT(strlen(prefix) == 2);
39 memcpy(cache->prefix, prefix, 3);
40 }
41 else
42 cache->prefix[0]= 0;
43 cache->file_name=0;
44 cache->buffer=0; /* Mark that not open */
45 if (!init_io_cache(cache, -1, cache_size, WRITE_CACHE, 0L, 0,
46 MYF(cache_myflags | MY_NABP)))
47 {
48 DBUG_RETURN(0);
49 }
50 DBUG_RETURN(1);
51 }
52
53 /**
54 Create the temporary file
55 */
real_open_cached_file(IO_CACHE * cache)56 my_bool real_open_cached_file(IO_CACHE *cache)
57 {
58 char name_buff[FN_REFLEN];
59 int error=1;
60 DBUG_ENTER("real_open_cached_file");
61 if ((cache->file= create_temp_file(name_buff, cache->dir,
62 cache->prefix[0] ? cache->prefix : 0,
63 O_BINARY, MYF(MY_WME | MY_TEMPORARY))) >= 0)
64 {
65 error=0;
66 }
67 DBUG_RETURN(error);
68 }
69
70
close_cached_file(IO_CACHE * cache)71 void close_cached_file(IO_CACHE *cache)
72 {
73 DBUG_ENTER("close_cached_file");
74 if (my_b_inited(cache))
75 {
76 File file=cache->file;
77 cache->file= -1; /* Don't flush data */
78 (void) end_io_cache(cache);
79 if (file >= 0)
80 {
81 (void) my_close(file,MYF(0));
82 #ifdef CANT_DELETE_OPEN_FILES
83 if (cache->file_name)
84 {
85 (void) my_delete(cache->file_name,MYF(MY_WME | ME_NOINPUT));
86 my_free(cache->file_name);
87 }
88 #endif
89 }
90 }
91 DBUG_VOID_RETURN;
92 }
93