Once again, rework the signal handling to be even more correct. We no

longer segfault when running test/signal/sigchld.c, which exposed a bit
of a rats nest.  The problem ended up being a erroneous syscall
defination, but in the process of finding that out, I scrubbed things
up nicely and adapted things to use the rt_ signals if they are
available.  This now passes all the signal tests.
 -Erik

1 files changed, 69 insertions, 23 deletions

diff --git a/libc/signal/allocrtsig.c b/libc/signal/allocrtsig.c
index 0822999c8..d648f691f 100644
--- a/libc/signal/allocrtsig.c
+++ b/libc/signal/allocrtsig.c
@@ -1,36 +1,82 @@
-/*
- * Ignore/stub out real-time signal allocation.
- *
- * Copyright (C) 2001 by Lineo, inc. and Erik Andersen
- * Copyright (C) 2001 by Erik Andersen <andersen@uclibc.org>
- * Written by Erik Andersen <andersen@uclibc.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Library General Public License as published by
- * the Free Software Foundation; either version 2 of the License, 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 Library General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Library 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
- *
- */
+/* Handle real-time signal allocation.
+   Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
 
 #include <signal.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+
+/* Only enable rt signals when it is supported at compile time */
+#ifdef __NR_rt_sigaction
+/* In these variables we keep track of the used variables.  If the
+   platform does not support any real-time signals we will define the
+   values to some unreasonable value which will signal failing of all
+   the functions below.  */
+
+static int current_rtmin = __SIGRTMIN;
+static int current_rtmax = __SIGRTMAX;
+
 
+
+#ifdef _POSIX_THREADS
+/* Allocate real-time signal with highest/lowest available
+   priority.  Please note that we don't use a lock since we assume
+   this function to be called at program start.  */
+int __libc_allocate_rtsig (int high)
+{
+    if (current_rtmin > current_rtmax)
+	/* We don't have anymore signals available.  */
+	return -1;
+
+    return high ? current_rtmin++ : current_rtmax--;
+}
+#endif
+
+/* Return number of available real-time signal with highest priority.  */
 int __libc_current_sigrtmin (void)
 {
-  return -1;
+    return current_rtmin;
 }
 
+/* Return number of available real-time signal with lowest priority.  */
 int __libc_current_sigrtmax (void)
 {
+    return current_rtmax;
+}
+
+#else
+
+#ifdef _POSIX_THREADS
+int __libc_allocate_rtsig (int high)
+{
+    return -1;
+}
+#endif
+
+int __libc_current_sigrtmin (void)
+{
   return -1;
 }
 
+int __libc_current_sigrtmax (void)
+{
+  return -1;
+}
+#endif