apps/ostest/suspend.c: Add a small test for SIGSTOP, SIGCONT, and SIGKILL actions. Currently does not work!

examples/ostest/Makefile

@@ -44,9 +44,18 @@ STACKSIZE = 2048
 # NuttX OS Test
 
 ASRCS =
-CSRCS = dev_null.c restart.c sigprocmask.c sighand.c signest.c
+CSRCS = dev_null.c restart.c sigprocmask.c
 MAINSRC = ostest_main.c
 
+ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+CSRCS +=  sighand.c signest.c
+ifeq ($(CONFIG_SIG_SIGSTOP_ACTION),y)
+ifeq ($(CONFIG_SIG_SIGKILL_ACTION),y)
+CSRCS += suspend.c
+endif
+endif
+endif
+
 ifeq ($(CONFIG_ARCH_FPU),y)
 ifneq ($(CONFIG_EXAMPLES_OSTEST_FPUTESTDISABLE),y)
 CSRCS += fpu.c

examples/ostest/ostest.h

@@ -204,6 +204,10 @@ void sighand_test(void);
 
 void signest_test(void);
 
+/* suspend.c ****************************************************************/
+
+void suspend_test(void);
+
 /* posixtimers.c ************************************************************/
 
 void timer_test(void);

examples/ostest/ostest_main.c

@@ -467,6 +467,7 @@ static int user_main(int argc, char *argv[])
       sigprocmask_test();
       check_test_memory_usage();
 
+#ifndef CONFIG_DISABLE_SIGNALS
       /* Verify signal handlers */
 
       printf("\nuser_main: signal handler test\n");
@@ -477,6 +478,13 @@ static int user_main(int argc, char *argv[])
       signest_test();
       check_test_memory_usage();
 
+#if defined(CONFIG_SIG_SIGSTOP_ACTION) && defined(CONFIG_SIG_SIGKILL_ACTION)
+      printf("\nuser_main: signal action test\n");
+      suspend_test();
+      check_test_memory_usage();
+#endif
+#endif
+
 #ifndef CONFIG_DISABLE_POSIX_TIMERS
       /* Verify posix timers (with SIGEV_SIGNAL) */
 

examples/ostest/suspend.c

@@ -0,0 +1,142 @@
+/****************************************************************************
+ * apps/examples/ostest/suspend.c
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <sched.h>
+#include <errno.h>
+#include "ostest.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int victim_main(int argc, char *argv[])
+{
+  printf("victim_main: Victim started\n" );
+
+  for (; ; )
+    {
+      sleep(3);
+      printf("victim_main: Wasting time\n" );
+      FFLUSH();
+    }
+
+  return 0; /* Won't get here */
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void suspend_test(void)
+{
+  struct sched_param param;
+  pid_t victim;
+  int ret;
+
+  /* Start victim thread  */
+
+  printf("suspend_test: Starting victim task\n" );
+  ret = sched_getparam (0, &param);
+  if (ret < 0)
+    {
+      printf("suspend_test: ERROR sched_getparam() failed\n" );
+      param.sched_priority = PTHREAD_DEFAULT_PRIORITY;
+    }
+
+  victim = task_create("victim", param.sched_priority,
+                           STACKSIZE, victim_main, NULL);
+  if (victim == ERROR)
+    {
+      printf("suspend_test: ERROR failed to start victim_main\n" );
+    }
+  else
+    {
+      printf("suspend_test: Started victim_main pid=%d\n", victim);
+    }
+
+  /* Wait a bit */
+
+  printf("suspend_test:  Is the victim saying anything?\n")
+  FFLUSH();
+  sleep(10);
+
+  /* Then signal the victim thread. */
+
+  printf("suspend_test: Signaling pid=%d with SIGSTOP\n", victim);
+  ret = kill(victim, SIGSTOP);
+  if (ret < 0)
+    {
+      printf("suspend_test: ERROR kill() failed\n" );
+    }
+
+  printf("suspend_test:  Is the victim still jabbering?\n")
+  FFLUSH();
+  sleep(10);
+
+  printf("suspend_test: Signaling pid=%d with SIGCONT\n", victim);
+  ret = kill(victim, SIGCONT);
+  if (ret < 0)
+    {
+      printf("suspend_test: ERROR kill() failed\n" );
+    }
+
+  printf("suspend_test:  The victim should continue the rant.\n")
+  FFLUSH();
+  sleep(10);
+
+  printf("suspend_test: Signaling pid=%d with SIGKILL\n", victim);
+  ret = kill(victim, SIGKILL);
+  if (ret < 0)
+    {
+      printf("suspend_test: ERROR kill() failed\n" );
+    }
+
+  FFLUSH();
+  sleep(1);
+  ret = kill(victim, 0);
+  if (ret >= 0)
+    {
+      printf("suspend_test: ERROR kill() on the dead victim succeeded!\n" );
+    }
+
+  printf("suspend_test: done\n" );
+  FFLUSH();
+}