signal.c

早期freebsd实现

/* Copyright (C) 1992 Free Software Foundation, Inc.
     Written by James Clark ([e-mail])

This file is part of groff.

groff 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.

groff 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 groff; see the file COPYING.  If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

/* Unfortunately vendors seem to have problems writing a <signal.h>
that is correct for C++, so we implement all signal handling in C. */

#include <sys/types.h>
#include <signal.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifndef RETSIGTYPE
#define RETSIGTYPE void
#endif

extern void cleanup();

static RETSIGTYPE handle_fatal_signal(signum)
     int signum;
{
  signal(signum, SIG_DFL);
  cleanup();
  kill(getpid(), signum);
}

void catch_fatal_signals()
{
#ifdef SIGHUP
  signal(SIGHUP, handle_fatal_signal);
#endif
  signal(SIGINT, handle_fatal_signal);
  signal(SIGTERM, handle_fatal_signal);
}

#ifndef HAVE_RENAME

void ignore_fatal_signals()
{
#ifdef SIGHUP
  signal(SIGHUP, SIG_IGN);
#endif
  signal(SIGINT, SIG_IGN);
  signal(SIGTERM, SIG_IGN);
}

#endif /* not HAVE_RENAME */