* tmpfile-safer.c: New file.

[gnulib.git] / lib / nanosleep.c

diff --git a/lib/nanosleep.c b/lib/nanosleep.c
index 902fd2d..7ffe05d 100644 (file)
--- a/lib/nanosleep.c
+++ b/lib/nanosleep.c
@@ -1,5 +1,7 @@
 /* Provide a replacement for the POSIX nanosleep function.
-   Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
+
+   Copyright (C) 1999, 2000, 2002, 2004, 2005, 2006 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
@@ -13,28 +15,42 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /* written by Jim Meyering */
 
-#include <config.h>
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
 
 /* 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 <stdbool.h>
 #include <stdio.h>
+#if HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
 #include <sys/types.h>
 #include <signal.h>
 
-#include <errno.h>
-#ifndef errno
-extern int errno;
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
 #endif
 
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <errno.h>
+
+#include <unistd.h>
+
+#include "timespec.h"
 
 /* Some systems (MSDOS) don't have SIGCONT.
    Using SIGTERM here turns the signal-handling code below
@@ -43,10 +59,11 @@ extern int errno;
 # define SIGCONT SIGTERM
 #endif
 
-#include "timespec.h"
+#if ! HAVE_SIGINTERRUPT
+# define siginterrupt(sig, flag) /* empty */
+#endif
 
-static int suspended;
-int first_call = 1;
+static sig_atomic_t volatile suspended;
 
 /* Handle SIGCONT. */
 
@@ -56,33 +73,42 @@ sighandler (int sig)
   suspended = 1;
 }
 
-/* FIXME: comment */
+/* Suspend execution for at least *TS_DELAY seconds.  */
 
 static void
 my_usleep (const struct timespec *ts_delay)
 {
   struct timeval tv_delay;
   tv_delay.tv_sec = ts_delay->tv_sec;
-  tv_delay.tv_usec = ts_delay->tv_nsec / 1000;
-  select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
+  tv_delay.tv_usec = (ts_delay->tv_nsec + 999) / 1000;
+  if (tv_delay.tv_usec == 1000000)
+    {
+      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, 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)
 {
-#ifdef SA_NOCLDSTOP
-  struct sigaction oldact, newact;
-#endif
-
-  suspended = 0;
+  static bool initialized;
 
   /* set up sig handler */
-  if (first_call)
+  if (! initialized)
     {
 #ifdef SA_NOCLDSTOP
+      struct sigaction oldact, newact;
       newact.sa_handler = sighandler;
       sigemptyset (&newact.sa_mask);
       newact.sa_flags = 0;
@@ -92,11 +118,16 @@ rpl_nanosleep (const struct timespec *requested_delay,
        sigaction (SIGCONT, &newact, NULL);
 #else
       if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
-       signal (SIGCONT, sighandler);
+       {
+         signal (SIGCONT, sighandler);
+         siginterrupt (SIGCONT, 1);
+       }
 #endif
-      first_call = 0;
+      initialized = true;
     }
 
+  suspended = 0;
+
   my_usleep (requested_delay);
 
   if (suspended)