/* Provide a replacement for the POSIX nanosleep function.
- Copyright (C) 1999 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2002, 2004 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
#include <config.h>
+/* 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>
#include <sys/types.h>
+#include <signal.h>
+
+#include <errno.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+/* 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"
-#include <time.h>
-/* FIXME: is including both like this kosher? */
-#include <sys/time.h>
+static sig_atomic_t volatile suspended;
-static interrupted;
+/* Handle SIGCONT. */
+
+static void
+sighandler (int sig)
+{
+ suspended = 1;
+}
-/* Sleep for USEC microseconds. */
+/* FIXME: comment */
static void
-usleep (const struct timespec *ts_delay)
+my_usleep (const struct timespec *ts_delay)
{
struct timeval tv_delay;
tv_delay.tv_sec = ts_delay->tv_sec;
- tv_delay.tv_usec = 1000 * ts_delay->tv_nsec;
- 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)
+ {
+ tv_delay.tv_sec++;
+ tv_delay.tv_usec = 0;
+ }
+ select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
}
+/* FIXME: comment */
+
int
-nanosleep (const struct timespec *requested_delay,
- struct timespec *remaining_delay)
+rpl_nanosleep (const struct timespec *requested_delay,
+ struct timespec *remaining_delay)
{
- interrupted = 0;
+ static bool initialized;
+
+#ifdef SA_NOCLDSTOP
+ struct sigaction oldact, newact;
+#endif
- /* set up sig handler -- but maybe only do this the first time? */
- /* FIXME */
+ suspended = 0;
- usleep (requested_delay);
+ /* set up sig handler */
+ if (! initialized)
+ {
+#ifdef SA_NOCLDSTOP
+ newact.sa_handler = sighandler;
+ sigemptyset (&newact.sa_mask);
+ newact.sa_flags = 0;
+
+ 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 = true;
+ }
- if (interrupted)
+ 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. */
+
+ errno = EINTR;
}
/* FIXME: Restore sig handler? */
- return interrupted;
+ return suspended;
}