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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 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
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