/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * 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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef TRAP_H
#define TRAP_H

#include <pg_config.h>
#include <unistd.h>
#include <setjmp.h>

#if defined(sun) || defined(_AIX)
typedef int __harg;
#endif

#if defined(hpux) || defined(ultrix) || defined(sun) || defined(_AIX)
# define ssignal __ssignal_protect
# include <signal.h>
# undef ssignal
# define ssignal _ssignal

  typedef void (*__sighandler_t)(__harg);

  extern const char *sys_siglist[NSIG];

  __BEGIN_DECLS
  extern int ualarm(u_int timer, u_int interval);
  extern int usleep(u_int timer);
  __END_DECLS
/* AIX defines SA_RESTART allready, but maybe wrong ??  */
# ifndef SA_RESTART
#   define SA_RESTART 0
# endif
#else
# include <signal.h>
# if __FreeBSD__ == 2 || BSD4_4
    typedef sig_t __sighandler_t;
# endif
#endif

#define T_SINTR   1
#define T_BLOCK   2
#define T_DISCARD 4

#define SIG_NULL SIG_ERR /* since NULL == SIG_DFL */

__BEGIN_DECLS
extern volatile bool israised[NSIG];
extern jmp_buf __signal_jmp[NSIG];
extern void __jsignal();

struct sigsave {
  bool             ss_blk;
  struct sigaction ss_sa;
  jmp_buf          ss_jmp;
};

#define istimeout     (israised[SIGALRM])
#define __timeout_jmp (__signal_jmp[SIGALRM])
#define __jtimeout    __jsignal

extern void svsignal(int sig, struct sigsave *ss);
extern void rssignal(int sig, struct sigsave *ss);
extern void  ssignal(int sig, __sighandler_t hdl, int flags);
extern void stimeout(int sec, __sighandler_t hdl, int flags);
__END_DECLS

#define atsignal(sig, flg) \
  if(setjmp(__signal_jmp[sig]) == 0) \
    { \
      ssignal(sig, __jsignal, T_SINTR | flg); \
    } \
  else

#define attimeout(sec) \
  if(setjmp(__timeout_jmp) == 0) \
    { \
      ualarm(sec * 1000000, 0); \
      ssignal(SIGALRM, __jtimeout, T_SINTR); \
    } \
  else

#define isignal(sig) { ssignal(sig, SIG_IGN, 0); }
#define dsignal(sig) { ssignal(sig, SIG_IGN, 0); }
#define csignal(sig) { ssignal(sig, SIG_DFL, T_DISCARD); }
#define ctimeout() { ualarm(0, 0); csignal(SIGALRM); }

#endif /* TRAP_H */