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lib/utime.c

@@ -0,0 +1,81 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+
+   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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* derived from a function in touch.c */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#undef utime
+
+#include <sys/types.h>
+
+#ifdef HAVE_UTIME_H
+# include <utime.h>
+#endif
+
+#include "safe-read.h"
+
+/* Some systems (even some that do have <utime.h>) don't declare this
+   structure anywhere.  */
+#ifndef HAVE_STRUCT_UTIMBUF
+struct utimbuf
+{
+  long actime;
+  long modtime;
+};
+#endif
+
+/* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
+   interpret it to set the access and modification times of FILE to
+   the current time.  Return 0 if successful, -1 if not. */
+
+static int
+utime_null (const char *file)
+{
+#if HAVE_UTIMES_NULL
+  return utimes (file, 0);
+#else
+  int fd;
+  char c;
+  int status = 0;
+  struct stat sb;
+
+  fd = open (file, O_RDWR, 0666);
+  if (fd < 0
+      || fstat (fd, &sb) < 0
+      || safe_read (fd, &c, sizeof (char)) < 0
+      || lseek (fd, (off_t) 0, SEEK_SET) < 0
+      || full_write (fd, &c, sizeof (char)) < 0
+      /* Maybe do this -- it's necessary on SunOS4.1.3 with some combination
+	 of patches, but that system doesn't use this code: it has utimes.
+	 || fsync (fd) < 0
+      */
+      || ftruncate (fd, st.st_size) < 0
+      || close (fd) < 0)
+    status = -1;
+  return status;
+#endif
+}
+
+int
+rpl_utime (const char *file, const struct utimbuf *times)
+{
+  if (times)
+    return utime (file, times);
+
+  return utime_null (file);
+}