Imported Upstream version 93u+upstream

1 files changed, 136 insertions, 0 deletions

diff --git a/src/lib/libast/misc/signal.c b/src/lib/libast/misc/signal.c
new file mode 100644
index 0000000..0d5fe9d
--- /dev/null
+++ b/src/lib/libast/misc/signal.c
@@ -0,0 +1,136 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              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