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 "command.h"
  20 #include "input.h"
  21 #include "init.h"
  22 #include "io.h"
  23
  24 #ifndef AT_EMPTY_PATH
  25 #define AT_EMPTY_PATH   0x1000
  26 #endif
  27
  28 static cmdinfo_t flink_cmd;
  29
  30 static void
  31 flink_help(void)
  32 {
  33         printf(_(
  34 "\n"
  35 "link the open file descriptor to the supplied filename\n"
  36 "\n"
  37 "\n"));
  38 }
  39
  40 static int
  41 flink_f(
  42         int             argc,
  43         char            **argv)
  44 {
  45         if (argc != 2)
  46                 return command_usage(&flink_cmd);
  47
  48         if (linkat(file->fd, "", AT_FDCWD, argv[1], AT_EMPTY_PATH) < 0) {
  49                 perror("flink");
  50                 return 0;
  51         }
  52         return 0;
  53 }
  54
  55 void
  56 flink_init(void)
  57 {
  58         flink_cmd.name = "flink";
  59         flink_cmd.cfunc = flink_f;
  60         flink_cmd.argmin = 1;
  61         flink_cmd.argmax = 1;
  62         flink_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK | CMD_FLAG_ONESHOT;
  63         flink_cmd.args = _("filename");
  64         flink_cmd.oneline =
  65                 _("link the open file descriptor to the supplied filename");
  66         flink_cmd.help = flink_help;
  67
  68         add_command(&flink_cmd);
  69 }