2004-04-05 Andrew Cagney <cagney@redhat.com>

	* gdb.base/sigaltstack.c: New file.
	* gdb.base/sigaltstack.exp: New file.

1 files changed, 95 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/sigaltstack.c b/gdb/testsuite/gdb.base/sigaltstack.c
new file mode 100644
index 00000000000..afcc8fbcb38
--- /dev/null
+++ b/gdb/testsuite/gdb.base/sigaltstack.c
@@ -0,0 +1,95 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2004 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 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 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.
+
+   Please email any bugs, comments, and/or additions to this file to:
+   bug-gdb@prep.ai.mit.edu  */
+
+#include <signal.h>
+#include <stdio.h>
+#include <sys/time.h>
+
+enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS };
+
+/* Levels completed flag.  */
+volatile enum level level = NR_LEVELS;
+
+void catcher (int signal);
+
+void
+thrower (enum level next_level, int sig, int itimer, int on_stack)
+{
+  level = next_level;
+  /* Set up the signal handler.  */
+  {
+    struct sigaction act;
+    memset (&act, 0, sizeof (act));
+    act.sa_handler = catcher;
+    act.sa_flags |= on_stack;
+    sigaction (sig, &act, NULL);
+  }
+  /* Set up a one-off timer.  A timer, rather than SIGSEGV, is used as
+     after a timer handler finishes the interrupted code can safely
+     resume.  */
+  {
+    struct itimerval itime;
+    memset (&itime, 0, sizeof (itime));
+    itime.it_value.tv_usec = 250 * 1000;
+    setitimer (itimer, &itime, NULL);
+  }
+  /* Wait.  */
+  while (level != LEAF);
+}
+
+void
+catcher (int signal)
+{
+  /* Find the next level.  */
+  switch (level)
+    {
+    case MAIN:
+      thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK);
+      break;
+    case OUTER:
+      thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK);
+      break;
+    case INNER:
+      level = LEAF;
+      return;
+    }
+}
+
+
+main ()
+{
+  /* Set up the altstack.  */
+  {
+    static char stack[SIGSTKSZ * NR_LEVELS];
+    struct sigaltstack alt;
+    memset (&alt, 0, sizeof (alt));
+    alt.ss_sp = stack;
+    alt.ss_size = SIGSTKSZ;
+    alt.ss_flags = 0;
+    if (sigaltstack (&alt, NULL) < 0)
+      {
+	perror ("sigaltstack");
+	exit (0);
+      }
+  }
+  level = MAIN;
+  catcher (0);
+}