/* Provide a replacement for the POSIX nanosleep function.   Copyright (C) 1999, 2000, 2002 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>/* 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 <stdio.h>#include <sys/types.h>#include <signal.h>#include <errno.h>#ifndef errnoextern int errno;#endif#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"static int suspended;int first_call = 1;/* Handle SIGCONT. */static voidsighandler (int sig){  suspended = 1;}/* FIXME: comment */static voidmy_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);}/* FIXME: comment */intrpl_nanosleep (const struct timespec *requested_delay,	       struct timespec *remaining_delay){#ifdef SA_NOCLDSTOP  struct sigaction oldact, newact;#endif  suspended = 0;  /* set up sig handler */  if (first_call)    {#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      first_call = 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.  */      errno = EINTR;    }  /* FIXME: Restore sig handler?  */  return suspended;}