io/link.c

   1 /*
   2  * Copyright (c) 2014 Christoph Hellwig.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <xfs/xfs.h>
  20 #include <xfs/command.h>
  21 #include <xfs/input.h>
  22 #include "init.h"
  23 #include "io.h"
  24
  25 #ifndef AT_EMPTY_PATH
  26 #define AT_EMPTY_PATH   0x1000
  27 #endif
  28
  29 static cmdinfo_t flink_cmd;
  30
  31 static void
  32 flink_help(void)
  33 {
  34         printf(_(
  35 "\n"
  36 "link the open file descriptor to the supplied filename\n"
  37 "\n"
  38 "\n"));
  39 }
  40
  41 static int
  42 flink_f(
  43         int             argc,
  44         char            **argv)
  45 {
  46         if (argc != 2)
  47                 return command_usage(&flink_cmd);
  48
  49         if (linkat(file->fd, "", AT_FDCWD, argv[1], AT_EMPTY_PATH) < 0) {
  50                 perror("flink");
  51                 return 0;
  52         }
  53         return 0;
  54 }
  55
  56 void
  57 flink_init(void)
  58 {
  59         flink_cmd.name = "flink";
  60         flink_cmd.cfunc = flink_f;
  61         flink_cmd.argmin = 1;
  62         flink_cmd.argmax = 1;
  63         flink_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
  64         flink_cmd.args = _("filename");
  65         flink_cmd.oneline =
  66                 _("link the open file descriptor to the supplied filename");
  67         flink_cmd.help = flink_help;
  68
  69         add_command(&flink_cmd);
  70 }