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, 49 insertions, 0 deletions

diff --git a/libc/signal/sigsuspend.c b/libc/signal/sigsuspend.c
new file mode 100644
index 000000000..ad6e0fc8e
--- /dev/null
+++ b/libc/signal/sigsuspend.c
@@ -0,0 +1,49 @@
+/* Copyright (C) 1991, 1996, 1997, 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <errno.h>
+#include <signal.h>
+#include <stddef.h>
+#include <unistd.h>
+
+
+/* Change the set of blocked signals to SET,
+   wait until a signal arrives, and restore the set of blocked signals.  */
+int __sigsuspend (const sigset_t *set)
+{
+    sigset_t oset;
+    int save;
+
+    if (set == NULL)
+    {
+	__set_errno (EINVAL);
+	return -1;
+    }
+
+    if (sigprocmask (SIG_SETMASK, set, &oset) < 0)
+	return -1;
+
+    (void) pause();
+    save = errno;
+
+    if (sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
+	return -1;
+
+    __set_errno (save);
+    return -1;
+}