X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fnanosleep.c;h=58fc7881eceedd4be36c145d516827879ba58195;hb=74a9f8aecf503bc6a6a1f955cc847a82b31ddbd4;hp=c5451ffc4f5992d4089751f192b7e70b4065bb56;hpb=c6beac9fc4202f59840b4b1e774ff803b43ec044;p=gnulib.git
diff --git a/lib/nanosleep.c b/lib/nanosleep.c
index c5451ffc4..58fc7881e 100644
--- a/lib/nanosleep.c
+++ b/lib/nanosleep.c
@@ -1,10 +1,11 @@
/* Provide a replacement for the POSIX nanosleep function.
- Copyright (C) 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1999-2000, 2002, 2004-2010 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.
+ 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
@@ -12,38 +13,84 @@
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. */
+ along with this program. If not, see . */
/* written by Jim Meyering */
#include
-/* Undefine nanosleep here so any prototype is not redefined to be a
- prototype for rpl_nanosleep. (they'd conflict e.g., on alpha-dec-osf3.2) */
-#undef nanosleep
+#include
+#include "intprops.h"
+#include "sig-handler.h"
+#include "verify.h"
+
+#include
#include
#include
+#include
#include
+#include
#include
-#ifndef errno
-extern int errno;
-#endif
-#if HAVE_UNISTD_H
-# include
-#endif
+#include
+
+#undef nanosleep
+
+enum { BILLION = 1000 * 1000 * 1000 };
+
+#if HAVE_BUG_BIG_NANOSLEEP
+
+int
+rpl_nanosleep (const struct timespec *requested_delay,
+ struct timespec *remaining_delay)
+{
+ /* nanosleep mishandles large sleeps due to internal overflow
+ problems. The worst known case of this is cygwin 1.5.x, which
+ can't sleep more than 49.7 days (2**32 milliseconds). Solve this
+ by breaking the sleep up into smaller chunks. Verify that time_t
+ is large enough. */
+ verify (TYPE_MAXIMUM (time_t) / 49 / 24 / 60 / 60);
+ const time_t limit = 49 * 24 * 60 * 60;
+ time_t seconds = requested_delay->tv_sec;
+ struct timespec intermediate;
+ intermediate.tv_nsec = 0;
+
+ while (limit < seconds)
+ {
+ int result;
+ intermediate.tv_sec = limit;
+ result = nanosleep (&intermediate, remaining_delay);
+ seconds -= limit;
+ if (result)
+ {
+ if (remaining_delay)
+ {
+ remaining_delay->tv_sec += seconds;
+ remaining_delay->tv_nsec += requested_delay->tv_nsec;
+ if (BILLION <= requested_delay->tv_nsec)
+ {
+ remaining_delay->tv_sec++;
+ remaining_delay->tv_nsec -= BILLION;
+ }
+ }
+ return result;
+ }
+ }
+ intermediate.tv_sec = seconds;
+ intermediate.tv_nsec = requested_delay->tv_nsec;
+ return nanosleep (&intermediate, remaining_delay);
+}
+
+#else
/* Some systems (MSDOS) don't have SIGCONT.
Using SIGTERM here turns the signal-handling code below
into a no-op on such systems. */
-#ifndef SIGCONT
-# define SIGCONT SIGTERM
-#endif
-
-#include "timespec.h"
+# ifndef SIGCONT
+# define SIGCONT SIGTERM
+# endif
static sig_atomic_t volatile suspended;
@@ -55,7 +102,7 @@ sighandler (int sig)
suspended = 1;
}
-/* FIXME: comment */
+/* Suspend execution for at least *TS_DELAY seconds. */
static void
my_usleep (const struct timespec *ts_delay)
@@ -65,51 +112,60 @@ my_usleep (const struct timespec *ts_delay)
tv_delay.tv_usec = (ts_delay->tv_nsec + 999) / 1000;
if (tv_delay.tv_usec == 1000000)
{
- tv_delay.tv_sec++;
- tv_delay.tv_usec = 0;
+ time_t t1 = tv_delay.tv_sec + 1;
+ if (t1 < tv_delay.tv_sec)
+ tv_delay.tv_usec = 1000000 - 1; /* close enough */
+ else
+ {
+ tv_delay.tv_sec = t1;
+ tv_delay.tv_usec = 0;
+ }
}
- select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
+ select (0, NULL, NULL, NULL, &tv_delay);
}
-/* FIXME: comment */
+/* Suspend execution for at least *REQUESTED_DELAY seconds. The
+ *REMAINING_DELAY part isn't implemented yet. */
int
rpl_nanosleep (const struct timespec *requested_delay,
- struct timespec *remaining_delay)
+ struct timespec *remaining_delay)
{
- static int initialized;
-
-#ifdef SA_NOCLDSTOP
- struct sigaction oldact, newact;
-#endif
+ static bool initialized;
- suspended = 0;
+ if (requested_delay->tv_nsec < 0 || BILLION <= requested_delay->tv_nsec)
+ {
+ errno = EINVAL;
+ return -1;
+ }
/* set up sig handler */
if (! initialized)
{
-#ifdef SA_NOCLDSTOP
- newact.sa_handler = sighandler;
- sigemptyset (&newact.sa_mask);
- newact.sa_flags = 0;
+ struct sigaction oldact;
sigaction (SIGCONT, NULL, &oldact);
- if (oldact.sa_handler != SIG_IGN)
- sigaction (SIGCONT, &newact, NULL);
-#else
- if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
- signal (SIGCONT, sighandler);
-#endif
- initialized = 1;
+ if (get_handler (&oldact) != SIG_IGN)
+ {
+ struct sigaction newact;
+
+ newact.sa_handler = sighandler;
+ sigemptyset (&newact.sa_mask);
+ newact.sa_flags = 0;
+ sigaction (SIGCONT, &newact, NULL);
+ }
+ initialized = true;
}
+ suspended = 0;
+
my_usleep (requested_delay);
if (suspended)
{
/* Calculate time remaining. */
/* FIXME: the code in sleep doesn't use this, so there's no
- rush to implement it. */
+ rush to implement it. */
errno = EINTR;
}
@@ -118,3 +174,4 @@ rpl_nanosleep (const struct timespec *requested_delay,
return suspended;
}
+#endif