Don't rely on inferior I/O in {call-signal-resume, unwindonsignal}.exp

These tests rely on inferior I/O, but that seems pointless and
unrelated here.  Simply remove the printf calls, and don't expect
them.

gdb/testsuite/ChangeLog:
2015-07-29  Pedro Alves  <palves@redhat.com>

	* gdb.base/call-signal-resume.exp: Remove check for
	gdb,noinferiorio.  Don't expect "no signal".  Use gdb_test.
	* gdb.base/unwindonsignal.exp: Likewise.
	* gdb.base/call-signals.c (gen_signal): Remove printf call.
	* gdb.base/unwindonsignal.c (gen_signal): Likewise.

gdb/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2015-07-29  Pedro Alves  <palves@redhat.com>
+
+	* gdb.base/call-signal-resume.exp: Remove check for
+	gdb,noinferiorio.  Don't expect "no signal".  Use gdb_test.
+	* gdb.base/unwindonsignal.exp: Likewise.
+	* gdb.base/call-signals.c (gen_signal): Remove printf call.
+	* gdb.base/unwindonsignal.c (gen_signal): Likewise.
+
 2015-07-29  Pedro Alves  <palves@redhat.com>
 
 	* gdb.base/siginfo-addr.c (pass): New function.

gdb/testsuite/gdb.base/call-signal-resume.exp

@@ -20,11 +20,6 @@
 # 2) Inferior is stopped at a signal.  Upon resumption it should continue
 #    with that signal, regardless of whatever the hand-called function did.
 
-if [target_info exists gdb,noinferiorio] {
-    verbose "Skipping call-signal-resume.exp because of no fileio capabilities."
-    continue
-}
-
 if [target_info exists gdb,nosignals] {
     verbose "Skipping call-signal-resume.exp because of nosignals."
     continue
@@ -72,15 +67,10 @@ gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, stop_one.*" \
 
 # Call function (causing the program to get a signal), and see if gdb handles
 # it properly.
-gdb_test_multiple "call gen_signal ()" \
-	"inferior function call signaled" {
-    -re "\[\r\n\]*no signal\[\r\n\]+$gdb_prompt $" {
-	unsupported "inferior function call signaled"
-	return 0
-    }
-    -re "\[\r\n\]*The program being debugged was signaled.*\[\r\n\]+$gdb_prompt $" {
-	pass "inferior function call signaled"
-    }
+if {[gdb_test "call gen_signal ()"  \
+	 "\[\r\n\]*The program being debugged was signaled.*" \
+	 "inferior function call signaled"] != 0} {
+    return 0
 }
 
 set frame_number [get_dummy_frame_number]

gdb/testsuite/gdb.base/call-signals.c

@@ -18,7 +18,6 @@
 /* Support program for testing handling of inferior function calls
    in the presence of signals.  */
 
-#include <stdio.h>
 #include <signal.h>
 #include <unistd.h>
 
@@ -32,8 +31,6 @@ gen_signal ()
 {
   /* According to sigall.exp, SIGABRT is always supported.  */
   kill (getpid (), SIGABRT);
-  /* If we get here we couldn't generate a signal, tell dejagnu.  */
-  printf ("no signal\n");
 }
 
 /* Easy place to set a breakpoint.  */

gdb/testsuite/gdb.base/unwindonsignal.c

@@ -17,7 +17,6 @@
 
 /* Support program for testing unwindonsignal.  */
 
-#include <stdio.h>
 #include <signal.h>
 #include <unistd.h>
 
@@ -26,8 +25,6 @@ gen_signal ()
 {
   /* According to sigall.exp, SIGABRT is always supported.  */
   kill (getpid (), SIGABRT);
-  /* If we get here we couldn't generate a signal, tell dejagnu.  */
-  printf ("no signal\n");
 }
 
 /* Easy place to set a breakpoint.  */

gdb/testsuite/gdb.base/unwindonsignal.exp

@@ -13,11 +13,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if [target_info exists gdb,noinferiorio] {
-    verbose "Skipping unwindonsignal.exp because of no fileio capabilities."
-    continue
-}
-
 if [target_info exists gdb,nosignals] {
     verbose "Skipping unwindonsignal.exp because of nosignals."
     continue
@@ -58,15 +53,10 @@ gdb_test "show unwindonsignal" \
 
 # Call function (causing the program to get a signal), and see if gdb handles
 # it properly.
-gdb_test_multiple "call gen_signal ()" \
-	"unwindonsignal, inferior function call signaled" {
-    -re "\[\r\n\]*no signal\[\r\n\]+$gdb_prompt $" {
-	unsupported "unwindonsignal, inferior function call signaled"
-	return 0
-    }
-    -re "\[\r\n\]*The program being debugged was signaled.*\[\r\n\]+$gdb_prompt $" {
-	pass "unwindonsignal, inferior function call signaled"
-    }
+if {[gdb_test "call gen_signal ()"  \
+	 "\[\r\n\]*The program being debugged was signaled.*" \
+	 "unwindonsignal, inferior function call signaled"] != 0} {
+    return 0
 }
 
 # Verify the stack got unwound.