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glibc  2.9
link.c
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00001 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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 <errno.h>
00020 #include <stddef.h>
00021 #include <unistd.h>
00022 #include <hurd.h>
00023 
00024 /* Make a link to FROM called TO.  */
00025 int
00026 __link (from, to)
00027      const char *from;
00028      const char *to;
00029 {
00030   error_t err;
00031   file_t oldfile, linknode, todir;
00032   char *toname;
00033 
00034   oldfile = __file_name_lookup (from, 0, 0);
00035   if (oldfile == MACH_PORT_NULL)
00036     return -1;
00037 
00038   /* The file_getlinknode RPC returns the port that should be passed to
00039      the receiving filesystem (the one containing TODIR) in dir_link.  */
00040 
00041   err = __file_getlinknode (oldfile, &linknode);
00042   __mach_port_deallocate (__mach_task_self (), oldfile);
00043   if (err)
00044     return __hurd_fail (err);
00045 
00046   todir = __file_name_split (to, &toname);
00047   if (todir != MACH_PORT_NULL)
00048     {
00049       err = __dir_link (todir, linknode, toname, 1);
00050       __mach_port_deallocate (__mach_task_self (), todir);
00051     }
00052   __mach_port_deallocate (__mach_task_self (), linknode);
00053   if (todir == MACH_PORT_NULL)
00054     return -1;
00055 
00056   if (err)
00057     return __hurd_fail (err);
00058   return 0;
00059 }
00060 
00061 weak_alias (__link, link)