gettimeofday: port recent C++ fix to Emacs

[gnulib.git] / lib / xnanosleep.c

diff --git a/lib/xnanosleep.c b/lib/xnanosleep.c
index ebbd7ee..d9b97a1 100644 (file)
--- a/lib/xnanosleep.c
+++ b/lib/xnanosleep.c
@@ -1,12 +1,11 @@
 /* xnanosleep.c -- a more convenient interface to nanosleep
 
-   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
-   Foundation, Inc.
+   Copyright (C) 2002-2007, 2009-2013 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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.
+   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
@@ -14,8 +13,7 @@
    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.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Mostly written (for sleep.c) by Paul Eggert.
    Factored out (creating this file) by Jim Meyering.  */
@@ -24,83 +22,36 @@
 
 #include "xnanosleep.h"
 
-#include <limits.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <assert.h>
+#include <timespec.h>
+
 #include <errno.h>
-#include <sys/types.h>
 #include <time.h>
 
-#include "intprops.h"
-
-#ifndef TIME_T_MAX
-# define TIME_T_MAX TYPE_MAXIMUM (time_t)
-#endif
-
 /* Sleep until the time (call it WAKE_UP_TIME) specified as
    SECONDS seconds after the time this function is called.
    SECONDS must be non-negative.  If SECONDS is so large that
-   it is not representable as a `struct timespec', then use
+   it is not representable as a 'struct timespec', then use
    the maximum value for that interval.  Return -1 on failure
    (setting errno), 0 on success.  */
 
 int
 xnanosleep (double seconds)
 {
-  enum { BILLION = 1000000000 };
-
-  bool overflow = false;
-  double ns;
-  struct timespec ts_sleep;
-
-  assert (0 <= seconds);
-
-  /* Separate whole seconds from nanoseconds.
-     Be careful to detect any overflow.  */
-  ts_sleep.tv_sec = seconds;
-  ns = BILLION * (seconds - ts_sleep.tv_sec);
-  overflow |= ! (ts_sleep.tv_sec <= seconds && 0 <= ns && ns <= BILLION);
-  ts_sleep.tv_nsec = ns;
-
-  /* Round up to the next whole number, if necessary, so that we
-     always sleep for at least the requested amount of time.  Assuming
-     the default rounding mode, we don't have to worry about the
-     rounding error when computing 'ns' above, since the error won't
-     cause 'ns' to drop below an integer boundary.  */
-  ts_sleep.tv_nsec += (ts_sleep.tv_nsec < ns);
-
-  /* Normalize the interval length.  nanosleep requires this.  */
-  if (BILLION <= ts_sleep.tv_nsec)
-    {
-      time_t t = ts_sleep.tv_sec + 1;
-
-      /* Detect integer overflow.  */
-      overflow |= (t < ts_sleep.tv_sec);
-
-      ts_sleep.tv_sec = t;
-      ts_sleep.tv_nsec -= BILLION;
-    }
+  struct timespec ts_sleep = dtotimespec (seconds);
 
   for (;;)
     {
-      if (overflow)
-       {
-         ts_sleep.tv_sec = TIME_T_MAX;
-         ts_sleep.tv_nsec = BILLION - 1;
-       }
-
       /* Linux-2.6.8.1's nanosleep returns -1, but doesn't set errno
-        when resumed after being suspended.  Earlier versions would
-        set errno to EINTR.  nanosleep from linux-2.6.10, as well as
-        implementations by (all?) other vendors, doesn't return -1
-        in that case;  either it continues sleeping (if time remains)
-        or it returns zero (if the wake-up time has passed).  */
+         when resumed after being suspended.  Earlier versions would
+         set errno to EINTR.  nanosleep from linux-2.6.10, as well as
+         implementations by (all?) other vendors, doesn't return -1
+         in that case;  either it continues sleeping (if time remains)
+         or it returns zero (if the wake-up time has passed).  */
       errno = 0;
       if (nanosleep (&ts_sleep, NULL) == 0)
-       break;
+        break;
       if (errno != EINTR && errno != 0)
-       return -1;
+        return -1;
     }
 
   return 0;