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/* Provide a replacement for the POSIX nanosleep function.
Copyright (C) 1999 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. */
/* written by Jim Meyering */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <time.h>
/* FIXME: is including both like this kosher? */
#include <sys/time.h>
static int suspended;
/* Handle SIGCONT. */
static void
sighandler (int sig)
{
#ifdef SA_INTERRUPT
struct sigaction sigact;
sigact.sa_handler = SIG_DFL;
sigemptyset (&sigact.sa_mask);
sigact.sa_flags = 0;
sigaction (sig, &sigact, NULL);
#else
signal (sig, SIG_DFL);
#endif
suspended = 1;
kill (getpid (), sig);
}
/* Sleep for USEC microseconds. */
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 = 1000 * ts_delay->tv_nsec;
select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
}
int
nanosleep (const struct timespec *requested_delay,
struct timespec *remaining_delay)
{
#ifdef SA_INTERRUPT
struct sigaction oldact, newact;
#endif
suspended = 0;
/* set up sig handler -- but maybe only do this the first time? */
#ifdef SA_INTERRUPT
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
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. */
}
/* FIXME: Restore sig handler? */
return suspended;
}
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