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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-14 19:33:32 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-14 19:33:32 +0000 |
commit | 8bb05ac73a5b448b339ce0bc8d396c82c459b47f (patch) | |
tree | 1fdda006866bca20d41cb206767ea5241e36852f /misc-utils/exch.c | |
parent | Adding debian version 2.39.3-11. (diff) | |
download | util-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.c | 95 |
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; +} |