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/* rename.c -- rename a file, preserving symlinks.
Copyright (C) 1999-2021 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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