From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Andrew Cagney <cagney@gnu.org>
Date: Fri, 27 Oct 2017 21:07:50 +0200
Subject: gdb-6.3-gstack-20050411.patch

;; Add a wrapper script to GDB that implements pstack using the
;; --readnever option.
;;=push

2004-11-23  Andrew Cagney  <cagney@redhat.com>

	* Makefile.in (uninstall-gstack, install-gstack): New rules, add
	to install and uninstall.
	* gstack.sh, gstack.1: New files.

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -2035,7 +2035,7 @@ info install-info clean-info dvi pdf install-pdf html install-html: force
 install: all
 	@$(MAKE) $(FLAGS_TO_PASS) install-only
 
-install-only: $(CONFIG_INSTALL)
+install-only: install-gstack $(CONFIG_INSTALL)
 	transformed_name=`t='$(program_transform_name)'; \
 			  echo gdb | sed -e "$$t"` ; \
 		if test "x$$transformed_name" = x; then \
@@ -2085,7 +2085,25 @@ install-guile:
 install-python:
 	$(SHELL) $(srcdir)/../mkinstalldirs $(DESTDIR)$(GDB_DATADIR)/python/gdb
 
-uninstall: force $(CONFIG_UNINSTALL)
+GSTACK=gstack
+.PHONY: install-gstack
+install-gstack:
+	transformed_name=`t='$(program_transform_name)'; \
+			  echo $(GSTACK) | sed -e "$$t"` ; \
+		if test "x$$transformed_name" = x; then \
+		  transformed_name=$(GSTACK) ; \
+		else \
+		  true ; \
+		fi ; \
+		$(SHELL) $(srcdir)/../mkinstalldirs $(DESTDIR)$(bindir) ; \
+		$(INSTALL_PROGRAM) $(srcdir)/$(GSTACK).sh \
+			$(DESTDIR)$(bindir)/$$transformed_name$(EXEEXT) ; \
+		: $(SHELL) $(srcdir)/../mkinstalldirs \
+			$(DESTDIR)$(man1dir) ; \
+		: $(INSTALL_DATA) $(srcdir)/gstack.1 \
+			$(DESTDIR)$(man1dir)/$$transformed_name.1
+
+uninstall: force uninstall-gstack $(CONFIG_UNINSTALL)
 	transformed_name=`t='$(program_transform_name)'; \
 			  echo gdb | sed -e $$t` ; \
 		if test "x$$transformed_name" = x; then \
@@ -2116,6 +2134,18 @@ uninstall: force $(CONFIG_UNINSTALL)
 	rm -f $(DESTDIR)$(bindir)/$$transformed_name
 	@$(MAKE) DO=uninstall "DODIRS=$(SUBDIRS)" $(FLAGS_TO_PASS) subdir_do
 
+.PHONY: uninstall-gstack
+uninstall-gstack:
+	transformed_name=`t='$(program_transform_name)'; \
+			  echo $(GSTACK) | sed -e $$t` ; \
+		if test "x$$transformed_name" = x; then \
+		  transformed_name=$(GSTACK) ; \
+		else \
+		  true ; \
+		fi ; \
+		rm -f $(DESTDIR)$(bindir)/$$transformed_name$(EXEEXT) \
+		      $(DESTDIR)$(man1dir)/$$transformed_name.1
+
 # The C++ name parser can be built standalone for testing.
 test-cp-name-parser.o: cp-name-parser.c
 	$(COMPILE) -DTEST_CPNAMES cp-name-parser.c
diff --git a/gdb/gstack.sh b/gdb/gstack.sh
new file mode 100644
--- /dev/null
+++ b/gdb/gstack.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+if test $# -ne 1; then
+    echo "Usage: `basename $0 .sh` <process-id>" 1>&2
+    exit 1
+fi
+
+if test ! -r /proc/$1; then
+    echo "Process $1 not found." 1>&2
+    exit 1
+fi
+
+# GDB doesn't allow "thread apply all bt" when the process isn't
+# threaded; need to peek at the process to determine if that or the
+# simpler "bt" should be used.
+
+backtrace="bt"
+if test -d /proc/$1/task ; then
+    # Newer kernel; has a task/ directory.
+    if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then
+	backtrace="thread apply all bt"
+    fi
+elif test -f /proc/$1/maps ; then
+    # Older kernel; go by it loading libpthread.
+    if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
+	backtrace="thread apply all bt"
+    fi
+fi
+
+GDB=${GDB:-gdb}
+
+# Run GDB, strip out unwanted noise.
+# --readnever is no longer used since .gdb_index is now in use.
+$GDB --quiet -nx $GDBARGS /proc/$1/exe $1 <<EOF 2>&1 |
+set width 0
+set height 0
+set pagination no
+$backtrace
+EOF
+/bin/sed -n \
+    -e 's/^\((gdb) \)*//' \
+    -e '/^#/p' \
+    -e '/^Thread/p'
diff --git a/gdb/testsuite/gdb.base/gstack.c b/gdb/testsuite/gdb.base/gstack.c
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gstack.c
@@ -0,0 +1,43 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2005, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+void
+func (void)
+{
+  const char msg[] = "looping\n";
+
+  /* Use the most simple notification not to get caught by attach on exiting
+     the function.  */
+  write (1, msg, strlen (msg));
+
+  for (;;);
+}
+
+int
+main (void)
+{
+  alarm (60);
+  nice (100);
+
+  func ();
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/gstack.exp b/gdb/testsuite/gdb.base/gstack.exp
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gstack.exp
@@ -0,0 +1,84 @@
+# Copyright (C) 2012 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 3 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, see <http://www.gnu.org/licenses/>.
+
+set testfile gstack
+set executable ${testfile}
+set binfile [standard_output_file $executable]
+if {[build_executable ${testfile} ${executable} "" {debug}] == -1} {
+    return -1
+}
+
+set test "spawn inferior"
+set command "${binfile}"
+set res [remote_spawn host $command];
+if { $res < 0 || $res == "" } {
+    perror "Spawning $command failed."
+    fail $test
+    return
+}
+
+# The spawn id of the test inferior.
+set test_spawn_id $res
+
+set use_gdb_stub 1
+set pid [exp_pid -i $res]
+gdb_expect {
+    -re "looping\r\n" {
+	pass $test
+    }
+    eof {
+	fail "$test (eof)"
+	return
+    }
+    timeout {
+	fail "$test (timeout)"
+	return
+    }
+}
+
+# Testcase uses the most simple notification not to get caught by attach on
+# exiting the function.  Still we could retry the gstack command if we fail.
+
+set test "spawn gstack"
+set command "sh -c GDB=$GDB\\ GDBARGS=-data-directory\\\\\\ $BUILD_DATA_DIRECTORY\\ sh\\ ${srcdir}/../gstack.sh\\ $pid\\;echo\\ GSTACK-END"
+set res [remote_spawn host $command];
+if { $res < 0 || $res == "" } {
+    perror "Spawning $command failed."
+    fail $test
+}
+
+set gdb_spawn_id $res
+
+gdb_test_multiple "" $test {
+    -re "^#0 +(0x\[0-9a-f\]+ in )?\\.?func \\(\\) at \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in \\.?main \\(\\) at \[^\r\n\]*\r\nGSTACK-END\r\n\$" {
+	pass $test
+    }
+}
+
+gdb_test_multiple "" "gstack exits" {
+    eof {
+	set result [wait -i $gdb_spawn_id]
+	verbose $result
+
+	gdb_assert { [lindex $result 2] == 0 } "gstack exits with no error"
+	gdb_assert { [lindex $result 3] == 0 } "gstack's exit status is 0"
+
+	remote_close host
+	clear_gdb_spawn_id
+    }
+}
+
+# Kill the test inferior.
+kill_wait_spawned_process $test_spawn_id
