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- /* Copyright (c) 2001, 2021, 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, version 2.0,
- as published by the Free Software Foundation.
-
- This program is also distributed with certain software (including
- but not limited to OpenSSL) that is licensed under separate terms,
- as designated in a particular file or component or in included license
- documentation. The authors of MySQL hereby grant you an additional
- permission to link the program and your derivative works with the
- separately licensed software that they have included with MySQL.
-
- Without limiting anything contained in the foregoing, this file,
- which is part of C Driver for MySQL (Connector/C), is also subject to the
- Universal FOSS Exception, version 1.0, a copy of which can be found at
- http://oss.oracle.com/licenses/universal-foss-exception.
-
- 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, version 2.0, 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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