io/link.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014 Christoph Hellwig.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "command.h"
   8 #include "input.h"
   9 #include "init.h"
  10 #include "io.h"
  11
  12 #ifndef AT_EMPTY_PATH
  13 #define AT_EMPTY_PATH   0x1000
  14 #endif
  15
  16 static cmdinfo_t flink_cmd;
  17
  18 static void
  19 flink_help(void)
  20 {
  21         printf(_(
  22 "\n"
  23 "link the open file descriptor to the supplied filename\n"
  24 "\n"
  25 "\n"));
  26 }
  27
  28 static int
  29 flink_f(
  30         int             argc,
  31         char            **argv)
  32 {
  33         if (argc != 2)
  34                 return command_usage(&flink_cmd);
  35
  36         if (linkat(file->fd, "", AT_FDCWD, argv[1], AT_EMPTY_PATH) < 0) {
  37                 perror("flink");
  38                 exitcode = 1;
  39                 return 0;
  40         }
  41         return 0;
  42 }
  43
  44 void
  45 flink_init(void)
  46 {
  47         flink_cmd.name = "flink";
  48         flink_cmd.cfunc = flink_f;
  49         flink_cmd.argmin = 1;
  50         flink_cmd.argmax = 1;
  51         flink_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK | CMD_FLAG_ONESHOT;
  52         flink_cmd.args = _("filename");
  53         flink_cmd.oneline =
  54                 _("link the open file descriptor to the supplied filename");
  55         flink_cmd.help = flink_help;
  56
  57         add_command(&flink_cmd);
  58 }