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glibc  2.9
rename.c
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00001 /* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdio.h>
00020 #include <unistd.h>
00021 #include <errno.h>
00022 
00023 /* Rename the file OLD to NEW.  */
00024 int
00025 rename (old, new)
00026      const char *old;
00027      const char *new;
00028 {
00029   int save = errno;
00030   if (__link (old, new) < 0)
00031     {
00032       if (errno == EEXIST)
00033        {
00034          __set_errno (save);
00035          /* Race condition, required for 1003.1 conformance.  */
00036          if (__unlink (new) < 0 ||
00037              __link (old, new) < 0)
00038            return -1;
00039        }
00040       else
00041        return -1;
00042     }
00043   if (__unlink (old) < 0)
00044     {
00045       save = errno;
00046       if (__unlink (new) == 0)
00047        __set_errno (save);
00048       return -1;
00049     }
00050   return 0;
00051 }