mf_tempfile.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:5k
- /* Copyright (C) 2000 MySQL AB
- 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; either version 2 of the License, or
- (at your option) any later version.
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
- #ifdef HAVE_TEMPNAM
- #if !defined(MSDOS) && !defined(OS2) && !defined(__NETWARE__)
- extern char **environ;
- #endif
- #endif
- /*
- Create a temporary file in a given directory
- This function should be used instead of my_tempnam() !
- */
- File create_temp_file(char *to, const char *dir, const char *prefix,
- int mode __attribute__((unused)),
- myf MyFlags __attribute__((unused)))
- {
- File file= -1;
- DBUG_ENTER("create_temp_file");
- #if defined(_MSC_VER)
- {
- char temp[FN_REFLEN],*end,*res,**old_env,*temp_env[1];
- old_env=environ;
- if (dir)
- {
- end=strend(dir)-1;
- if (!dir[0])
- { /* Change empty string to current dir */
- to[0]= FN_CURLIB;
- to[1]= 0;
- dir=to;
- }
- else if (*end == FN_DEVCHAR)
- { /* Get current dir for drive */
- _fullpath(temp,dir,FN_REFLEN);
- dir=to;
- }
- else if (*end == FN_LIBCHAR && dir < end && end[-1] != FN_DEVCHAR)
- {
- strmake(to,dir,(uint) (end-dir)); /* Copy and remove last '' */
- dir=to;
- }
- environ=temp_env; /* Force use of dir (dir not checked) */
- temp_env[0]=0;
- }
- if ((res=tempnam((char*) dir,(char *) prefix)))
- {
- strmake(to,res,FN_REFLEN-1);
- (*free)(res);
- file=my_create(to,0, mode | O_EXCL | O_NOFOLLOW, MyFlags);
- }
- environ=old_env;
- }
- #elif defined(_ZTC__)
- if (!dir)
- dir=getenv("TMPDIR");
- if ((res=tempnam((char*) dir,(char *) prefix)))
- {
- strmake(to,res,FN_REFLEN-1);
- (*free)(res);
- file=my_create(to, 0, mode | O_EXCL | O_NOFOLLOW, MyFlags);
- }
- #elif defined(HAVE_MKSTEMP) && !defined(__NETWARE__)
- {
- 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=P_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);
- 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;
- (void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
- my_errno=tmp;
- }
- }
- #elif defined(HAVE_TEMPNAM)
- {
- 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;
- }
- #ifdef OS2
- /* changing environ variable doesn't work with VACPP */
- char buffer[256], *end;
- buffer[sizeof(buffer)-1]= 0;
- end= strxnmov(buffer, sizeof(buffer)-1, (char*) "TMP=", dir, NullS);
- /* remove ending backslash */
- if (end[-1] == '\')
- end[-1]= 0;
- putenv(buffer);
- #elif !defined(__NETWARE__)
- old_env= (char**) environ;
- if (dir)
- { /* Don't use TMPDIR if dir is given */
- environ=(const char**) temp_env;
- temp_env[0]=0;
- }
- #endif
- 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));
- }
- #if !defined(OS2) && !defined(__NETWARE__)
- environ=(const char**) old_env;
- #endif
- }
- #else
- {
- register long uniq;
- register int length;
- my_string pos,end_pos;
- /* Make an unique number */
- pthread_mutex_lock(&THR_LOCK_open);
- uniq= ((long) getpid() << 20) + (long) _my_tempnam_used++ ;
- pthread_mutex_unlock(&THR_LOCK_open);
- if (!dir && !(dir=getenv("TMPDIR"))) /* Use this if possibly */
- dir=P_tmpdir; /* Use system default */
- length=strlen(dir)+strlen(pfx)+1;
- DBUG_PRINT("test",("mallocing %d byte",length+8+sizeof(TMP_EXT)+1));
- if (length+8+sizeof(TMP_EXT)+1 > FN_REFLENGTH)
- errno=my_errno= ENAMETOOLONG;
- else
- {
- end_pos=strmov(to,dir);
- if (end_pos != to && end_pos[-1] != FN_LIBCHAR)
- *end_pos++=FN_LIBCHAR;
- end_pos=strmov(end_pos,pfx);
- for (length=0 ; length < 8 && uniq ; length++)
- {
- *end_pos++= _dig_vec_upper[(int) (uniq & 31)];
- uniq >>= 5;
- }
- (void) strmov(end_pos,TMP_EXT);
- file=my_create(to,0,
- (int) (O_RDWR | O_BINARY | O_TRUNC | O_EXCL | O_NOFOLLOW |
- O_TEMPORARY | O_SHORT_LIVED),
- MYF(MY_WME));
- }
- }
- #endif
- if (file >= 0)
- thread_safe_increment(my_tmp_file_created,&THR_LOCK_open);
- DBUG_RETURN(file);
- }