mirror of
git://git.code.sf.net/p/cdesktopenv/code
synced 2025-03-09 15:50:02 +00:00
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2022 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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/*
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* signal that disables syscall restart on interrupt with clear signal mask
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* fun==SIG_DFL also unblocks signal
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*/
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#if !_UWIN && !__HAIKU__
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#undef signal
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#define signal ______signal
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#endif
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#include <ast.h>
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#include <sig.h>
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#if !_UWIN
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#undef signal
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#undef _def_map_ast
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#include <ast_map.h>
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#if defined(__EXPORT__)
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#define extern __EXPORT__
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#endif
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#endif
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#if defined(SV_ABORT)
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#undef SV_INTERRUPT
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#define SV_INTERRUPT SV_ABORT
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#endif
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#if !_std_signal && (_lib_sigaction && defined(SA_NOCLDSTOP) || _lib_sigvec && defined(SV_INTERRUPT))
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#if !defined(SA_NOCLDSTOP) || !defined(SA_INTERRUPT) && defined(SV_INTERRUPT)
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#undef SA_INTERRUPT
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#define SA_INTERRUPT SV_INTERRUPT
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#undef sigaction
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#define sigaction sigvec
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#undef sigemptyset
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#define sigemptyset(p) (*(p)=0)
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#undef sa_flags
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#define sa_flags sv_flags
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#undef sa_handler
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#define sa_handler sv_handler
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#undef sa_mask
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#define sa_mask sv_mask
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#endif
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extern Sig_handler_t
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signal(int sig, Sig_handler_t fun)
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{
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struct sigaction na;
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struct sigaction oa;
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int unblock;
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#ifdef SIGNO_MASK
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unsigned int flags;
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#endif
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if (sig < 0)
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{
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sig = -sig;
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unblock = 0;
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}
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else
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unblock = fun == SIG_DFL;
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#ifdef SIGNO_MASK
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flags = sig & ~SIGNO_MASK;
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sig &= SIGNO_MASK;
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#endif
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memzero(&na, sizeof(na));
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na.sa_handler = fun;
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#if defined(SA_INTERRUPT) || defined(SA_RESTART)
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switch (sig)
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{
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#if defined(SIGIO) || defined(SIGTSTP) || defined(SIGTTIN) || defined(SIGTTOU)
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#if defined(SIGIO)
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case SIGIO:
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#endif
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#if defined(SIGTSTP)
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case SIGTSTP:
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#endif
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#if defined(SIGTTIN)
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case SIGTTIN:
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#endif
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#if defined(SIGTTOU)
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case SIGTTOU:
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#endif
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#if defined(SA_RESTART)
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na.sa_flags = SA_RESTART;
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#endif
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break;
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#endif
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default:
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#if defined(SA_INTERRUPT)
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na.sa_flags = SA_INTERRUPT;
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#endif
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break;
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}
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#endif
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if (sigaction(sig, &na, &oa))
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return 0;
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if (unblock)
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sigunblock(sig);
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return oa.sa_handler;
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}
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#else
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NoN(signal)
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#endif
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