From 23510b930ea31f7de8005e2f0ff6cab7062b4e26 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Thu, 19 Aug 2010 15:23:06 +0200
Subject: [PATCH 2/2] use futimens() if available, instead of utime()

---
 configure.ac |  1 +
 src/files.c  | 46 +++++++++++++++++++++++++++++++++++-----------
 2 files changed, 36 insertions(+), 11 deletions(-)

diff --git a/configure.ac b/configure.ac
index 66f8ee3..f4975d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -468,6 +468,7 @@ int main(void)
 
 
 dnl Checks for functions.
+AC_CHECK_FUNCS(futimens)
 
 if test "x$enable_utf8" != xno; then
     AC_CHECK_FUNCS(iswalnum iswpunct mblen mbstowcs mbtowc wctomb)
diff --git a/src/files.c b/src/files.c
index 99cc1b8..9a1bdcc 100644
--- a/src/files.c
+++ b/src/files.c
@@ -1570,6 +1570,29 @@ int copy_file(FILE *inn, FILE *out)
     return retval;
 }
 
+#ifdef HAVE_FUTIMENS
+/* set atime/mtime by file descriptor */
+int utime_wrap(int fd, const char *filename, struct utimbuf *ut)
+{
+    struct timespec times[2];
+    (void) filename;
+
+    times[0].tv_sec = ut->actime;
+    times[1].tv_sec = ut->modtime;
+    times[0].tv_nsec = 0L;
+    times[1].tv_nsec = 0L;
+
+    return futimens(fd, times);
+}
+#else
+/* set atime/mtime by file name */
+int utime_wrap(int fd, const char *filename, struct utimbuf *ut)
+{
+    (void) fd;
+    return utime(filename, ut);
+}
+#endif
+
 /* Write a file out to disk.  If f_open isn't NULL, we assume that it is
  * a stream associated with the file, and we don't try to open it
  * ourselves.  If tmp is TRUE, we set the umask to disallow anyone else
@@ -1789,17 +1812,9 @@ bool write_file(const char *name, FILE *f_open, bool tmp,
 	fprintf(stderr, "Backing up %s to %s\n", realname, backupname);
 #endif
 
-	/* Copy the file. */
-	copy_status = copy_file(f, backup_file);
-
-	if (copy_status != 0) {
-	    statusline(ALERT, _("Error reading %s: %s"), realname,
-			strerror(errno));
-	    goto cleanup_and_exit;
-	}
-
-	/* And set its metadata. */
-	if (utime(backupname, &filetime) == -1 && !ISSET(INSECURE_BACKUP)) {
+	/* Set backup's file metadata. */
+	if (utime_wrap(backup_fd, backupname, &filetime) == -1
+		&& !ISSET(INSECURE_BACKUP)) {
 	    if (prompt_failed_backupwrite(backupname))
 		goto skip_backup;
 	    statusline(HUSH, _("Error writing backup file %s: %s"),
@@ -1811,6 +1826,15 @@ bool write_file(const char *name, FILE *f_open, bool tmp,
 	    goto cleanup_and_exit;
 	}
 
+	/* Copy the file. */
+	copy_status = copy_file(f, backup_file);
+
+	if (copy_status != 0) {
+	    statusline(ALERT, _("Error reading %s: %s"), realname,
+			strerror(errno));
+	    goto cleanup_and_exit;
+	}
+
 	free(backupname);
     }
 
-- 
1.7.4