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/* Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
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 "my_sys.h"
#include "mysys_err.h"
#include <m_string.h>
#include <errno.h>
#include "my_thread_local.h"
#include "my_dir.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
my_stpcpy(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 */
set_my_errno(errno);
if (my_errno() == EINVAL)
{
result= 1;
my_stpcpy(to,filename);
}
else
{
if (MyFlags & MY_WME)
{
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_CANT_READLINK, MYF(0), filename,
errno, my_strerror(errbuf, sizeof(errbuf), 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;
set_my_errno(errno);
if (MyFlags & MY_WME)
{
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_CANT_SYMLINK, MYF(0), linkname, content,
errno, my_strerror(errbuf, sizeof(errbuf), errno));
}
}
else if ((MyFlags & MY_SYNC_DIR) && my_sync_dir_by_file(linkname, MyFlags))
result= -1;
DBUG_RETURN(result);
#endif /* HAVE_READLINK */
}
#if defined(MAXPATHLEN)
#define BUFF_LEN MAXPATHLEN
#else
#define BUFF_LEN FN_LEN
#endif
int my_is_symlink(const char *filename MY_ATTRIBUTE((unused)),
ST_FILE_ID *file_id)
{
#if defined (HAVE_LSTAT) && defined (S_ISLNK)
struct stat stat_buff;
int result= !lstat(filename, &stat_buff) && S_ISLNK(stat_buff.st_mode);
if (file_id && !result)
{
file_id->st_dev= stat_buff.st_dev;
file_id->st_ino= stat_buff.st_ino;
}
return result;
#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'
*/
int my_realpath(char *to, const char *filename, myf MyFlags)
{
#if defined(HAVE_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));
set_my_errno(errno);
if (MyFlags & MY_WME)
{
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_REALPATH, MYF(0), filename,
my_errno(), my_strerror(errbuf, sizeof(errbuf), 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)
{
set_my_errno((ret > FN_REFLEN) ? ENAMETOOLONG : GetLastError());
if (MyFlags & MY_WME)
{
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_REALPATH, MYF(0), filename,
my_errno(), my_strerror(errbuf, sizeof(errbuf), 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;
}
/**
Return non-zero if the file descriptor and a previously lstat-ed file
identified by file_id point to the same file
*/
int my_is_same_file(File file, const ST_FILE_ID *file_id)
{
MY_STAT stat_buf;
if (my_fstat(file, &stat_buf, MYF(0)) == -1)
{
set_my_errno(errno);
return 0;
}
return (stat_buf.st_dev == file_id->st_dev)
&& (stat_buf.st_ino == file_id->st_ino);
}
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