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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:33:32 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:33:32 +0000
commit8bb05ac73a5b448b339ce0bc8d396c82c459b47f (patch)
tree1fdda006866bca20d41cb206767ea5241e36852f /misc-utils/exch.c
parentAdding debian version 2.39.3-11. (diff)
downloadutil-linux-8bb05ac73a5b448b339ce0bc8d396c82c459b47f.tar.xz
util-linux-8bb05ac73a5b448b339ce0bc8d396c82c459b47f.zip
Merging upstream version 2.40.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--misc-utils/exch.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/misc-utils/exch.c b/misc-utils/exch.c
new file mode 100644
index 0000000..93a9f77
--- /dev/null
+++ b/misc-utils/exch.c
@@ -0,0 +1,95 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Copyright (C) 2023 Red Hat, Inc. All rights reserved.
+ * Written by Masatake YAMATO <yamato@redhat.com>
+ *
+ * exch(1) - a command line interface for RENAME_EXCHANGE of renameat2(2).
+ */
+#include "c.h"
+#include "nls.h"
+
+#include <fcntl.h>
+#include <getopt.h>
+
+#ifndef HAVE_RENAMEAT2
+# include <sys/syscall.h>
+# include <unistd.h>
+#endif
+
+#ifndef RENAME_EXCHANGE
+# define RENAME_EXCHANGE (1 << 1)
+#endif
+
+#if !defined(HAVE_RENAMEAT2) && defined(SYS_renameat2)
+static inline int renameat2(int olddirfd, const char *oldpath,
+ int newdirfd, const char *newpath, unsigned int flags)
+{
+ return syscall (SYS_renameat2, olddirfd, oldpath, newdirfd, newpath, flags);
+}
+#endif
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] oldpath newpath\n"), program_invocation_short_name);
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Atomically exchanges paths between two files.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fprintf(out, USAGE_HELP_OPTIONS(30));
+
+ fprintf(out, USAGE_MAN_TAIL("exch(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+ int c;
+ int rc;
+
+ static const struct option longopts[] = {
+ { "version", no_argument, NULL, 'V' },
+ { "help", no_argument, NULL, 'h' },
+ { NULL }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+
+ while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ if (argc - optind < 2) {
+ warnx(_("too few arguments"));
+ errtryhelp(EXIT_FAILURE);
+ } else if (argc - optind > 2) {
+ warnx(_("too many arguments"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ rc = renameat2(AT_FDCWD, argv[optind],
+ AT_FDCWD, argv[optind + 1], RENAME_EXCHANGE);
+ if (rc)
+ warn(_("failed to exchange \"%s\" and \"%s\""),
+ argv[optind], argv[optind + 1]);
+
+ return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}