Drizzled Public API Documentation

mf_tempfile.cc

00001 /* Copyright (C) 2000 MySQL AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; version 2 of the License.
00006 
00007    This program is distributed in the hope that it will be useful,
00008    but WITHOUT ANY WARRANTY; without even the implied warranty of
00009    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00010    GNU General Public License for more details.
00011 
00012    You should have received a copy of the GNU General Public License
00013    along with this program; if not, write to the Free Software
00014    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
00015 
00016 #include <config.h>
00017 
00018 #include <drizzled/internal/my_sys.h>
00019 #include <drizzled/internal/m_string.h>
00020 #include "my_static.h"
00021 #include <drizzled/error.h>
00022 #include <stdio.h>
00023 #include <errno.h>
00024 #include <string>
00025 #ifdef HAVE_PATHS_H
00026 #include <paths.h>
00027 #endif
00028 
00029 using namespace std;
00030 namespace drizzled
00031 {
00032 namespace internal
00033 {
00034 
00035 /*
00036   @brief
00037   Create a temporary file with unique name in a given directory
00038 
00039   @details
00040   create_temp_file
00041     to             pointer to buffer where temporary filename will be stored
00042     dir            directory where to create the file
00043     prefix         prefix the filename with this
00044     MyFlags        Magic flags
00045 
00046   @return
00047     File descriptor of opened file if success
00048     -1 and sets errno if fails.
00049 
00050   @note
00051     The behaviour of this function differs a lot between
00052     implementation, it's main use is to generate a file with
00053     a name that does not already exist.
00054 
00055     The implementation using mkstemp should be considered the
00056     reference implementation when adding a new or modifying an
00057     existing one
00058 
00059 */
00060 
00061 int create_temp_file(char *to, const char *dir, const char *prefix,
00062                      myf MyFlags)
00063 {
00064   int file= -1;
00065 
00066   int org_file;
00067   string prefix_str;
00068 
00069   prefix_str= prefix ? prefix : "tmp.";
00070   prefix_str.append("XXXXXX");
00071 
00072   if (!dir && ! (dir =getenv("TMPDIR")))
00073     dir= P_tmpdir;
00074   if (strlen(dir)+prefix_str.length() > FN_REFLEN-2)
00075   {
00076     errno= ENAMETOOLONG;
00077     return(file);
00078   }
00079   strcpy(convert_dirname(to,dir,NULL),prefix_str.c_str());
00080   org_file=mkstemp(to);
00081   /* TODO: This was old behavior, but really don't we want to
00082    * unlink files immediately under all circumstances?
00083    * if (mode & O_TEMPORARY)
00084     (void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
00085   */
00086   file=my_register_filename(org_file, to, EE_CANTCREATEFILE, MyFlags);
00087 
00088   /* If we didn't manage to register the name, remove the temp file */
00089   if (org_file >= 0 && file < 0)
00090   {
00091     int tmp=errno;
00092     close(org_file);
00093     (void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
00094     errno=tmp;
00095   }
00096 
00097   return(file);
00098 }
00099 
00100 } /* namespace internal */
00101 } /* namespace drizzled */