1 /* vi: set sw=4 ts=4: */
3 * Mini ln implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 /* BB_AUDIT SUSv3 compliant */
11 /* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
16 /* This is a NOEXEC applet. Be very careful! */
21 #define LN_NODEREFERENCE 4
25 int ln_main(int argc, char **argv);
26 int ln_main(int argc, char **argv)
28 int status = EXIT_SUCCESS;
33 char *suffix = (char*)"~";
35 int (*link_func)(const char *, const char *);
37 flag = getopt32(argv, "sfnbS:", &suffix);
43 last = argv[argc - 1];
46 if (argc == optind + 1) {
48 last = bb_get_last_path_component(xstrdup(last));
56 (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
59 src_name = xstrdup(*argv);
60 src = concat_path_file(src, bb_get_last_path_component(src_name));
64 if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
65 // coreutils: "ln dangling_symlink new_hardlink" works
66 if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
67 bb_perror_msg("%s", *argv);
68 status = EXIT_FAILURE;
74 if (flag & LN_BACKUP) {
76 backup = xasprintf("%s%s", src, suffix);
77 if (rename(src, backup) < 0 && errno != ENOENT) {
78 bb_perror_msg("%s", src);
79 status = EXIT_FAILURE;
85 * When the source and dest are both hard links to the same
86 * inode, a rename may succeed even though nothing happened.
87 * Therefore, always unlink().
90 } else if (flag & LN_FORCE) {
95 if (flag & LN_SYMLINK) {
99 if (link_func(*argv, src) != 0) {
100 bb_perror_msg("%s", src);
101 status = EXIT_FAILURE;
106 } while ((++argv)[1]);