[gdb/testsuite] Handle ptrace operation not permitted in can_spawn_for_attach

When running the testsuite on a system with kernel.yama.ptrace_scope set to 1,
we run into attach failures.

Fix this by recognizing "ptrace: Operation not permitted" in
can_spawn_for_attach.

Tested on aarch64-linux and x86_64-linux.

Approved-By: Pedro Alves <pedro@palves.net>

4 files changed, 28 insertions, 23 deletions

diff --git a/gdb/testsuite/gdb.threads/attach-into-signal.exp b/gdb/testsuite/gdb.threads/attach-into-signal.exp
index 87e3407..91da960 100644
--- a/gdb/testsuite/gdb.threads/attach-into-signal.exp
+++ b/gdb/testsuite/gdb.threads/attach-into-signal.exp
@@ -17,7 +17,8 @@
 # This file was created by Jan Kratochvil <jan.kratochvil@redhat.com>.
 
 # This test only works on Linux
-require !use_gdb_stub isnative
+require can_spawn_for_attach
+require isnative
 require {!is_remote host}
 require {istarget *-linux*}
 
diff --git a/gdb/testsuite/gdb.threads/attach-slow-waitpid.exp b/gdb/testsuite/gdb.threads/attach-slow-waitpid.exp
index dc3e62a..28d70da 100644
--- a/gdb/testsuite/gdb.threads/attach-slow-waitpid.exp
+++ b/gdb/testsuite/gdb.threads/attach-slow-waitpid.exp
@@ -37,7 +37,8 @@
 # during the attach phase.
 
 # This test only works on Linux
-require !use_gdb_stub isnative
+require can_spawn_for_attach
+require isnative
 require {!is_remote host}
 require {istarget *-linux*}
 
diff --git a/gdb/testsuite/gdb.threads/attach-stopped.exp b/gdb/testsuite/gdb.threads/attach-stopped.exp
index 78e194c..0421ffc 100644
--- a/gdb/testsuite/gdb.threads/attach-stopped.exp
+++ b/gdb/testsuite/gdb.threads/attach-stopped.exp
@@ -18,7 +18,8 @@
 # This file was updated by Jan Kratochvil <jan.kratochvil@redhat.com>.
 
 # This test only works on Linux
-require !use_gdb_stub isnative
+require can_spawn_for_attach
+require isnative
 require {!is_remote host}
 require {istarget *-linux*}
 
diff --git a/gdb/testsuite/gdb.threads/check-libthread-db.exp b/gdb/testsuite/gdb.threads/check-libthread-db.exp
index 5662eed..6976fe6 100644
--- a/gdb/testsuite/gdb.threads/check-libthread-db.exp
+++ b/gdb/testsuite/gdb.threads/check-libthread-db.exp
@@ -102,25 +102,27 @@ with_test_prefix "automated load-time check" {
     }
 
     # Automated load-time check with NPTL fully operational.
-    with_test_prefix "libpthread.so fully initialized" {
-	clean_restart ${binfile}
-
-	gdb_test_no_output "maint set check-libthread-db 1"
-	gdb_test_no_output "set debug libthread-db 1"
-
-	set test_spawn_id [spawn_wait_for_attach $binfile]
-	set testpid [spawn_id_get_pid $test_spawn_id]
-
-	gdb_test_sequence "attach $testpid" \
-	    "check debug libthread-db output" {
-		"\[\r\n\]+Running libthread_db integrity checks:"
-		"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
-		"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
-		"\[\r\n\]+libthread_db integrity checks passed."
-		"\[\r\n\]+[Thread debugging using libthread_db enabled]"
-	    }
-
-	gdb_exit
-	kill_wait_spawned_process $test_spawn_id
+    if { [can_spawn_for_attach] } {
+	with_test_prefix "libpthread.so fully initialized" {
+	    clean_restart ${binfile}
+
+	    gdb_test_no_output "maint set check-libthread-db 1"
+	    gdb_test_no_output "set debug libthread-db 1"
+
+	    set test_spawn_id [spawn_wait_for_attach $binfile]
+	    set testpid [spawn_id_get_pid $test_spawn_id]
+
+	    gdb_test_sequence "attach $testpid" \
+		"check debug libthread-db output" {
+		    "\[\r\n\]+Running libthread_db integrity checks:"
+		    "\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
+		    "\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
+		    "\[\r\n\]+libthread_db integrity checks passed."
+		    "\[\r\n\]+[Thread debugging using libthread_db enabled]"
+		}
+
+	    gdb_exit
+	    kill_wait_spawned_process $test_spawn_id
+	}
     }
 }