Logo Search packages:      
Sourcecode: ksh version File versions  Download package

signal.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * signal that disables syscall restart on interrupt with clear signal mask
 * fun==SIG_DFL also unblocks signal
 */

#if !_UWIN

#undef      signal
#define signal          ______signal

#endif

#include <ast.h>
#include <sig.h>

#if !_UWIN

#undef      signal

#undef      _def_map_ast
#include <ast_map.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

#endif

#if defined(SV_ABORT)                                         
#undef      SV_INTERRUPT
#define SV_INTERRUPT    SV_ABORT
#endif

#if !_std_signal && (_lib_sigaction && defined(SA_NOCLDSTOP) || _lib_sigvec && defined(SV_INTERRUPT))

#if !defined(SA_NOCLDSTOP) || !defined(SA_INTERRUPT) && defined(SV_INTERRUPT)
#undef      SA_INTERRUPT
#define SA_INTERRUPT    SV_INTERRUPT
#undef      sigaction
#define sigaction sigvec
#undef      sigemptyset
#define sigemptyset(p)  (*(p)=0)
#undef      sa_flags
#define sa_flags  sv_flags
#undef      sa_handler
#define sa_handler      sv_handler
#undef      sa_mask
#define     sa_mask           sv_mask
#endif

extern Sig_handler_t
signal(int sig, Sig_handler_t fun)
{
      struct sigaction  na;
      struct sigaction  oa;
      int               unblock;
#ifdef SIGNO_MASK
      unsigned int            flags;
#endif

      if (sig < 0)
      {
            sig = -sig;
            unblock = 0;
      }
      else
            unblock = fun == SIG_DFL;
#ifdef SIGNO_MASK
      flags = sig & ~SIGNO_MASK;
      sig &= SIGNO_MASK;
#endif
      memzero(&na, sizeof(na));
      na.sa_handler = fun;
#if defined(SA_INTERRUPT) || defined(SA_RESTART)
      switch (sig)
      {
#if defined(SIGIO) || defined(SIGTSTP) || defined(SIGTTIN) || defined(SIGTTOU)
#if defined(SIGIO)
      case SIGIO:
#endif
#if defined(SIGTSTP)
      case SIGTSTP:
#endif
#if defined(SIGTTIN)
      case SIGTTIN:
#endif
#if defined(SIGTTOU)
      case SIGTTOU:
#endif
#if defined(SA_RESTART)
            na.sa_flags = SA_RESTART;
#endif
            break;
#endif
      default:
#if defined(SA_INTERRUPT)
            na.sa_flags = SA_INTERRUPT;
#endif
            break;
      }
#endif
      if (sigaction(sig, &na, &oa))
            return 0;
      if (unblock)
            sigunblock(sig);
      return oa.sa_handler;
}

#else

NoN(signal)

#endif

Generated by  Doxygen 1.6.0   Back to index