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145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* rename.c -- rename a file, preserving symlinks.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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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 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bucomm.h"
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#ifdef HAVE_GOOD_UTIME_H
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#include <utime.h>
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#elif defined HAVE_UTIMES
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#include <sys/time.h>
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#endif
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/* The number of bytes to copy at once. */
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#define COPY_BUF 8192
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/* Copy file FROMFD to file TO, performing no translations.
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Return 0 if ok, -1 if error. */
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static int
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simple_copy (int fromfd, const char *to,
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struct stat *target_stat ATTRIBUTE_UNUSED)
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{
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int tofd, nread;
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int saved;
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char buf[COPY_BUF];
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if (fromfd < 0
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|| lseek (fromfd, 0, SEEK_SET) != 0)
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return -1;
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tofd = open (to, O_WRONLY | O_TRUNC | O_BINARY);
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if (tofd < 0)
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{
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saved = errno;
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close (fromfd);
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errno = saved;
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return -1;
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}
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while ((nread = read (fromfd, buf, sizeof buf)) > 0)
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{
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if (write (tofd, buf, nread) != nread)
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{
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saved = errno;
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close (fromfd);
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close (tofd);
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errno = saved;
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return -1;
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}
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}
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saved = errno;
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#if !defined (_WIN32) || defined (__CYGWIN32__)
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/* Writing to a setuid/setgid file may clear S_ISUID and S_ISGID.
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Try to restore them, ignoring failure. */
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if (target_stat != NULL)
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fchmod (tofd, target_stat->st_mode);
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#endif
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close (fromfd);
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close (tofd);
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if (nread < 0)
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{
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errno = saved;
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return -1;
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}
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return 0;
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}
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/* Set the times of the file DESTINATION to be the same as those in
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STATBUF. */
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void
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set_times (const char *destination, const struct stat *statbuf)
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{
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int result;
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#ifdef HAVE_GOOD_UTIME_H
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struct utimbuf tb;
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tb.actime = statbuf->st_atime;
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tb.modtime = statbuf->st_mtime;
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result = utime (destination, &tb);
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#elif defined HAVE_UTIMES
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struct timeval tv[2];
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tv[0].tv_sec = statbuf->st_atime;
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tv[0].tv_usec = 0;
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tv[1].tv_sec = statbuf->st_mtime;
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tv[1].tv_usec = 0;
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result = utimes (destination, tv);
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#else
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long tb[2];
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tb[0] = statbuf->st_atime;
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tb[1] = statbuf->st_mtime;
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result = utime (destination, tb);
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#endif
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if (result != 0)
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non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
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}
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/* Copy FROM to TO. TARGET_STAT has the file status that, if non-NULL,
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is used to fix up timestamps. Return 0 if ok, -1 if error.
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At one time this function renamed files, but file permissions are
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tricky to update given the number of different schemes used by
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various systems. So now we just copy. */
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int
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smart_rename (const char *from, const char *to, int fromfd,
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struct stat *target_stat, bfd_boolean preserve_dates)
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{
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int ret;
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ret = simple_copy (fromfd, to, target_stat);
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if (ret != 0)
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non_fatal (_("unable to copy file '%s'; reason: %s"),
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to, strerror (errno));
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if (preserve_dates)
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set_times (to, target_stat);
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unlink (from);
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return ret;
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}
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