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- /* rename.c -- rename a file, preserving symlinks.
- Copyright (C) 1999-2022 Free Software Foundation, Inc.
- This file is part of GNU Binutils.
- 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 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
- 02110-1301, USA. */
- #include "sysdep.h"
- #include "bfd.h"
- #include "bucomm.h"
- #if defined HAVE_UTIMES
- #include <sys/time.h>
- #elif defined HAVE_GOOD_UTIME_H
- #include <utime.h>
- #endif
- /* The number of bytes to copy at once. */
- #define COPY_BUF 8192
- /* Copy file FROMFD to file TO, performing no translations.
- Return 0 if ok, -1 if error. */
- static int
- simple_copy (int fromfd, const char *to,
- struct stat *target_stat ATTRIBUTE_UNUSED)
- {
- int tofd, nread;
- int saved;
- char buf[COPY_BUF];
- if (fromfd < 0
- || lseek (fromfd, 0, SEEK_SET) != 0)
- return -1;
- tofd = open (to, O_WRONLY | O_TRUNC | O_BINARY);
- if (tofd < 0)
- {
- saved = errno;
- close (fromfd);
- errno = saved;
- return -1;
- }
- while ((nread = read (fromfd, buf, sizeof buf)) > 0)
- {
- if (write (tofd, buf, nread) != nread)
- {
- saved = errno;
- close (fromfd);
- close (tofd);
- errno = saved;
- return -1;
- }
- }
- saved = errno;
- #if !defined (_WIN32) || defined (__CYGWIN32__)
- /* Writing to a setuid/setgid file may clear S_ISUID and S_ISGID.
- Try to restore them, ignoring failure. */
- if (target_stat != NULL)
- fchmod (tofd, target_stat->st_mode);
- #endif
- close (fromfd);
- close (tofd);
- if (nread < 0)
- {
- errno = saved;
- return -1;
- }
- return 0;
- }
- /* The following defines and inline functions are copied from gnulib.
- FIXME: Use a gnulib import and stat-time.h instead. */
- #if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
- # if defined TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
- # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
- # else
- # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
- # endif
- #elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
- # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
- #elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
- # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
- #elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
- # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
- #endif
- static inline long int get_stat_atime_ns (struct stat const *) ATTRIBUTE_UNUSED;
- static inline long int get_stat_mtime_ns (struct stat const *) ATTRIBUTE_UNUSED;
- /* Return the nanosecond component of *ST's access time. */
- static inline long int
- get_stat_atime_ns (struct stat const *st ATTRIBUTE_UNUSED)
- {
- # if defined STAT_TIMESPEC
- return STAT_TIMESPEC (st, st_atim).tv_nsec;
- # elif defined STAT_TIMESPEC_NS
- return STAT_TIMESPEC_NS (st, st_atim);
- # else
- return 0;
- # endif
- }
- /* Return the nanosecond component of *ST's data modification time. */
- static inline long int
- get_stat_mtime_ns (struct stat const *st ATTRIBUTE_UNUSED)
- {
- # if defined STAT_TIMESPEC
- return STAT_TIMESPEC (st, st_mtim).tv_nsec;
- # elif defined STAT_TIMESPEC_NS
- return STAT_TIMESPEC_NS (st, st_mtim);
- # else
- return 0;
- # endif
- }
- #if defined HAVE_UTIMENSAT
- /* Return *ST's access time. */
- static inline struct timespec
- get_stat_atime (struct stat const *st)
- {
- #ifdef STAT_TIMESPEC
- return STAT_TIMESPEC (st, st_atim);
- #else
- struct timespec t;
- t.tv_sec = st->st_atime;
- t.tv_nsec = get_stat_atime_ns (st);
- return t;
- #endif
- }
- /* Return *ST's data modification time. */
- static inline struct timespec
- get_stat_mtime (struct stat const *st)
- {
- #ifdef STAT_TIMESPEC
- return STAT_TIMESPEC (st, st_mtim);
- #else
- struct timespec t;
- t.tv_sec = st->st_mtime;
- t.tv_nsec = get_stat_mtime_ns (st);
- return t;
- #endif
- }
- #endif
- /* End FIXME. */
- /* Set the times of the file DESTINATION to be the same as those in
- STATBUF. */
- void
- set_times (const char *destination, const struct stat *statbuf)
- {
- int result;
- #if defined HAVE_UTIMENSAT
- struct timespec times[2];
- times[0] = get_stat_atime (statbuf);
- times[1] = get_stat_mtime (statbuf);
- result = utimensat (AT_FDCWD, destination, times, 0);
- #elif defined HAVE_UTIMES
- struct timeval tv[2];
- tv[0].tv_sec = statbuf->st_atime;
- tv[0].tv_usec = get_stat_atime_ns (statbuf) / 1000;
- tv[1].tv_sec = statbuf->st_mtime;
- tv[1].tv_usec = get_stat_mtime_ns (statbuf) / 1000;
- result = utimes (destination, tv);
- #elif defined HAVE_GOOD_UTIME_H
- struct utimbuf tb;
- tb.actime = statbuf->st_atime;
- tb.modtime = statbuf->st_mtime;
- result = utime (destination, &tb);
- #else
- long tb[2];
- tb[0] = statbuf->st_atime;
- tb[1] = statbuf->st_mtime;
- result = utime (destination, tb);
- #endif
- if (result != 0)
- non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
- }
- /* Copy FROM to TO. TARGET_STAT has the file status that, if non-NULL,
- is used to fix up timestamps. Return 0 if ok, -1 if error.
- At one time this function renamed files, but file permissions are
- tricky to update given the number of different schemes used by
- various systems. So now we just copy. */
- int
- smart_rename (const char *from, const char *to, int fromfd,
- struct stat *target_stat, bool preserve_dates)
- {
- int ret = 0;
- if (to != from)
- {
- ret = simple_copy (fromfd, to, target_stat);
- if (ret != 0)
- non_fatal (_("unable to copy file '%s'; reason: %s"),
- to, strerror (errno));
- unlink (from);
- }
- if (preserve_dates)
- set_times (to, target_stat);
- return ret;
- }
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