1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
Copyright (c) 2001, 2011, Oracle and/or its affiliates
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <m_string.h>
#include <errno.h>
#ifdef HAVE_REALPATH
#include <sys/param.h>
#include <sys/stat.h>
#endif
/*
Reads the content of a symbolic link
If the file is not a symbolic link, return the original file name in to.
RETURN
0 If filename was a symlink, (to will be set to value of symlink)
1 If filename was a normal file (to will be set to filename)
-1 on error.
*/
int my_readlink(char *to, const char *filename, myf MyFlags)
{
#ifndef HAVE_READLINK
strmov(to,filename);
return 1;
#else
int result=0;
int length;
DBUG_ENTER("my_readlink");
if ((length=readlink(filename, to, FN_REFLEN-1)) < 0)
{
/* Don't give an error if this wasn't a symlink */
if ((my_errno=errno) == EINVAL)
{
result= 1;
strmov(to,filename);
}
else
{
if (MyFlags & MY_WME)
my_error(EE_CANT_READLINK, MYF(0), filename, errno);
result= -1;
}
}
else
to[length]=0;
DBUG_PRINT("exit" ,("result: %d", result));
DBUG_RETURN(result);
#endif /* HAVE_READLINK */
}
/* Create a symbolic link */
int my_symlink(const char *content, const char *linkname, myf MyFlags)
{
#ifndef HAVE_READLINK
return 0;
#else
int result;
DBUG_ENTER("my_symlink");
DBUG_PRINT("enter",("content: %s linkname: %s", content, linkname));
result= 0;
if (symlink(content, linkname))
{
result= -1;
my_errno=errno;
if (MyFlags & MY_WME)
my_error(EE_CANT_SYMLINK, MYF(0), linkname, content, errno);
}
else if ((MyFlags & MY_SYNC_DIR) && my_sync_dir_by_file(linkname, MyFlags))
result= -1;
DBUG_RETURN(result);
#endif /* HAVE_READLINK */
}
#if defined(SCO)
#define BUFF_LEN 4097
#elif defined(MAXPATHLEN)
#define BUFF_LEN MAXPATHLEN
#else
#define BUFF_LEN FN_LEN
#endif
int my_is_symlink(const char *filename __attribute__((unused)))
{
#if defined (HAVE_LSTAT) && defined (S_ISLNK)
struct stat stat_buff;
return !lstat(filename, &stat_buff) && S_ISLNK(stat_buff.st_mode);
#elif defined (_WIN32)
DWORD dwAttr = GetFileAttributes(filename);
return (dwAttr != INVALID_FILE_ATTRIBUTES) &&
(dwAttr & FILE_ATTRIBUTE_REPARSE_POINT);
#else /* No symlinks */
return 0;
#endif
}
/*
Resolve all symbolic links in path
'to' may be equal to 'filename'
to is guaranteed to never set to a string longer than FN_REFLEN
(including the end \0)
*/
int my_realpath(char *to, const char *filename, myf MyFlags)
{
#if defined(HAVE_REALPATH) && !defined(HAVE_BROKEN_REALPATH)
int result=0;
char buff[BUFF_LEN];
char *ptr;
DBUG_ENTER("my_realpath");
DBUG_PRINT("info",("executing realpath"));
if ((ptr=realpath(filename,buff)))
strmake(to, ptr, FN_REFLEN-1);
else
{
/*
Realpath didn't work; Use my_load_path() which is a poor substitute
original name but will at least be able to resolve paths that starts
with '.'.
*/
DBUG_PRINT("error",("realpath failed with errno: %d", errno));
my_errno=errno;
if (MyFlags & MY_WME)
my_error(EE_REALPATH, MYF(0), filename, my_errno);
my_load_path(to, filename, NullS);
result= -1;
}
DBUG_RETURN(result);
#elif defined(_WIN32)
int ret= GetFullPathName(filename,FN_REFLEN, to, NULL);
if (ret == 0 || ret > FN_REFLEN)
{
my_errno= (ret > FN_REFLEN) ? ENAMETOOLONG : GetLastError();
if (MyFlags & MY_WME)
my_error(EE_REALPATH, MYF(0), filename, my_errno);
/*
GetFullPathName didn't work : use my_load_path() which is a poor
substitute original name but will at least be able to resolve
paths that starts with '.'.
*/
my_load_path(to, filename, NullS);
return -1;
}
#else
my_load_path(to, filename, NullS);
#endif
return 0;
}
|
