102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) 2023 Red Hat, Inc. All rights reserved.
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* Written by Masatake YAMATO <yamato@redhat.com>
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*
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* exch(1) - a command line interface for RENAME_EXCHANGE of renameat2(2).
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*/
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#include "c.h"
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#include "nls.h"
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#include <fcntl.h>
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#include <getopt.h>
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#ifndef HAVE_RENAMEAT2
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# include <sys/syscall.h>
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# include <unistd.h>
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#endif
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#ifndef RENAME_EXCHANGE
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# define RENAME_EXCHANGE (1 << 1)
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#endif
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static inline int rename_exchange(const char *oldpath, const char *newpath)
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{
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int rc;
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#if defined(HAVE_RENAMEAT2)
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rc = renameat2(AT_FDCWD, oldpath, AT_FDCWD, newpath, RENAME_EXCHANGE);
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#elif defined(SYS_renameat2)
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rc = syscall(SYS_renameat2,
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AT_FDCWD, oldpath, AT_FDCWD, newpath, RENAME_EXCHANGE);
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#else
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rc = -1;
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errno = ENOSYS;
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#endif
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return rc;
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}
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s [options] oldpath newpath\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Atomically exchanges paths between two files.\n"), out);
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fputs(USAGE_OPTIONS, out);
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fprintf(out, USAGE_HELP_OPTIONS(30));
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fprintf(out, USAGE_MAN_TAIL("exch(1)"));
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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int c;
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static const struct option longopts[] = {
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{ NULL }
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) {
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switch (c) {
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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}
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if (argc - optind < 2) {
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warnx(_("too few arguments"));
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errtryhelp(EXIT_FAILURE);
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} else if (argc - optind > 2) {
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warnx(_("too many arguments"));
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errtryhelp(EXIT_FAILURE);
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}
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if (rename_exchange(argv[optind], argv[optind + 1]) != 0) {
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warn(_("failed to exchange \"%s\" and \"%s\""),
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argv[optind], argv[optind + 1]);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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