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/* Copyright (c) 2000, 2013, 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 <m_string.h>
#include "my_static.h"
#include "mysys_err.h"
#include <errno.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
/*
@brief
Create a temporary file with unique name in a given directory
@details
create_temp_file
to pointer to buffer where temporary filename will be stored
dir directory where to create the file
prefix prefix the filename with this
mode Flags to use for my_create/my_open
MyFlags Magic flags
@return
File descriptor of opened file if success
-1 and sets errno if fails.
@note
The behaviour of this function differs a lot between
implementation, it's main use is to generate a file with
a name that does not already exist.
When passing O_TEMPORARY flag in "mode" the file should
be automatically deleted
The implementation using mkstemp should be considered the
reference implementation when adding a new or modifying an
existing one
*/
File create_temp_file(char *to, const char *dir, const char *prefix,
int mode __attribute__((unused)),
myf MyFlags __attribute__((unused)))
{
File file= -1;
#ifdef __WIN__
TCHAR path_buf[MAX_PATH-14];
#endif
DBUG_ENTER("create_temp_file");
DBUG_PRINT("enter", ("dir: %s, prefix: %s", dir, prefix));
#if defined (__WIN__)
/*
Use GetTempPath to determine path for temporary files.
This is because the documentation for GetTempFileName
has the following to say about this parameter:
"If this parameter is NULL, the function fails."
*/
if (!dir)
{
if(GetTempPath(sizeof(path_buf), path_buf) > 0)
dir = path_buf;
}
/*
Use GetTempFileName to generate a unique filename, create
the file and release it's handle
- uses up to the first three letters from prefix
*/
if (GetTempFileName(dir, prefix, 0, to) == 0)
DBUG_RETURN(-1);
DBUG_PRINT("info", ("name: %s", to));
/*
Open the file without the "open only if file doesn't already exist"
since the file has already been created by GetTempFileName
*/
if ((file= my_open(to, (mode & ~O_EXCL), MyFlags)) < 0)
{
/* Open failed, remove the file created by GetTempFileName */
int tmp= my_errno;
(void) my_delete(to, MYF(0));
my_errno= tmp;
}
#elif defined(HAVE_MKSTEMP)
{
char prefix_buff[30];
uint pfx_len;
File org_file;
pfx_len= (uint) (strmov(strnmov(prefix_buff,
prefix ? prefix : "tmp.",
sizeof(prefix_buff)-7),"XXXXXX") -
prefix_buff);
if (!dir && ! (dir =getenv("TMPDIR")))
dir= DEFAULT_TMPDIR;
if (strlen(dir)+ pfx_len > FN_REFLEN-2)
{
errno=my_errno= ENAMETOOLONG;
DBUG_RETURN(file);
}
strmov(convert_dirname(to,dir,NullS),prefix_buff);
org_file=mkstemp(to);
if (mode & O_TEMPORARY)
(void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
file=my_register_filename(org_file, to, FILE_BY_MKSTEMP,
EE_CANTCREATEFILE, MyFlags);
/* If we didn't manage to register the name, remove the temp file */
if (org_file >= 0 && file < 0)
{
int tmp=my_errno;
close(org_file);
(void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
my_errno=tmp;
}
}
#elif defined(HAVE_TEMPNAM)
{
extern char **environ;
char *res,**old_env,*temp_env[1];
if (dir && !dir[0])
{ /* Change empty string to current dir */
to[0]= FN_CURLIB;
to[1]= 0;
dir=to;
}
old_env= (char**) environ;
if (dir)
{ /* Don't use TMPDIR if dir is given */
environ=(const char**) temp_env;
temp_env[0]=0;
}
if ((res=tempnam((char*) dir, (char*) prefix)))
{
strmake(to,res,FN_REFLEN-1);
(*free)(res);
file=my_create(to,0,
(int) (O_RDWR | O_BINARY | O_TRUNC | O_EXCL | O_NOFOLLOW |
O_TEMPORARY | O_SHORT_LIVED),
MYF(MY_WME));
}
else
{
DBUG_PRINT("error",("Got error: %d from tempnam",errno));
}
environ=(const char**) old_env;
}
#else
#error No implementation found for create_temp_file
#endif
if (file >= 0)
thread_safe_increment(my_tmp_file_created,&THR_LOCK_open);
DBUG_RETURN(file);
}
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