1 files changed, 89 insertions, 0 deletions
diff --git a/texinfo/info/signals.h b/texinfo/info/signals.h
new file mode 100644
index 00000000000..ab87a3b5495
--- /dev/null
+++ b/texinfo/info/signals.h
@@ -0,0 +1,89 @@
+/* signals.h -- Header to include system dependent signal definitions. */
+
+/* This file is part of GNU Info, a program for reading online documentation
+   stored in Info format.
+
+   Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+
+   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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Written by Brian Fox (bfox@ai.mit.edu). */
+
+#if !defined (_SIGNALS_H_)
+#define _SIGNALS_H_
+
+#include <signal.h>
+
+#if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
+#  define sigmask(x) (1 << ((x)-1))
+#endif /* !HAVE_SIGPROCMASK && !sigmask */
+
+#if !defined (HAVE_SIGPROCMASK)
+#  if !defined (SIG_BLOCK)
+#    define SIG_UNBLOCK 1
+#    define SIG_BLOCK   2
+#    define SIG_SETMASK 3
+#  endif /* SIG_BLOCK */
+
+/* Type of a signal set. */
+#  define sigset_t int
+
+/* Make SET have no signals in it. */
+#  define sigemptyset(set) (*(set) = (sigset_t)0x0)
+
+/* Make SET have the full range of signal specifications possible. */
+#  define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
+
+/* Add SIG to the contents of SET. */
+#  define sigaddset(set, sig) *(set) |= sigmask (sig)
+
+/* Delete SIG from the contents of SET. */
+#  define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
+
+/* Tell if SET contains SIG. */
+#  define sigismember(set, sig) (*(set) & (sigmask (sig)))
+
+/* Suspend the process until the reception of one of the signals
+   not present in SET. */
+#  define sigsuspend(set) sigpause (*(set))
+#endif /* !HAVE_SIGPROCMASK */
+
+#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
+/* These definitions are used both in POSIX and non-POSIX implementations. */
+
+#define BLOCK_SIGNAL(sig) \
+  do { \
+    sigset_t nvar, ovar; \
+    sigemptyset (&nvar); \
+    sigemptyset (&ovar); \
+    sigaddset (&nvar, sig); \
+    sigprocmask (SIG_BLOCK, &nvar, &ovar); \
+  } while (0)
+
+#define UNBLOCK_SIGNAL(sig) \
+  do { \
+    sigset_t nvar, ovar; \
+    sigemptyset (&ovar); \
+    sigemptyset (&nvar); \
+    sigaddset (&nvar, sig); \
+    sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
+  } while (0)
+
+#else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
+#  define BLOCK_SIGNAL(sig)
+#  define UNBLOCK_SIGNAL(sig)
+#endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
+
+#endif /* !_SIGNALS_H_ */