Use SIGCHLD with waitpid(); implemented wait() and waitid()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5515 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog.txt

@@ -464,4 +464,5 @@
 	* apps/exampes/posix_spawn: Added a test of poxis_spawn().
 	* apps/examples/ostest:  Extend signal handler test to catch
 	  death-of-child signals (SIGCHLD).
-
+	* apps/examples/ostest/waitpid.c:  Add a test for waitpid(), waitid(),
+	  and wait().

examples/ostest/Makefile

@@ -52,6 +52,10 @@ ifeq ($(CONFIG_ARCH_FPU),y)
 CSRCS		+= fpu.c
 endif
 
+ifeq ($(CONFIG_SCHED_WAITPID),y)
+CSRCS		+= waitpid.c
+endif
+
 ifneq ($(CONFIG_DISABLE_PTHREAD),y)
 CSRCS		+= cancel.c cond.c mutex.c sem.c barrier.c
 ifneq ($(CONFIG_RR_INTERVAL),0)

examples/ostest/ostest.h

@@ -105,68 +105,74 @@
 
 /* dev_null.c ***************************************************************/
 
-extern int dev_null(void);
+int dev_null(void);
 
 /* fpu.c ********************************************************************/
 
-extern void fpu_test(void);
+void fpu_test(void);
+
+/* waitpid.c ****************************************************************/
+
+#ifdef CONFIG_SCHED_WAITPID
+int waitpid_test(void);
+#endif
 
 /* mutex.c ******************************************************************/
 
-extern void mutex_test(void);
+void mutex_test(void);
 
 /* rmutex.c ******************************************************************/
 
-extern void recursive_mutex_test(void);
+void recursive_mutex_test(void);
 
 /* sem.c ********************************************************************/
 
-extern void sem_test(void);
+void sem_test(void);
 
 /* cond.c *******************************************************************/
 
-extern void cond_test(void);
+void cond_test(void);
 
 /* mqueue.c *****************************************************************/
 
-extern void mqueue_test(void);
+void mqueue_test(void);
 
 /* timedmqueue.c ************************************************************/
 
-extern void timedmqueue_test(void);
+void timedmqueue_test(void);
 
 /* cancel.c *****************************************************************/
 
-extern void cancel_test(void);
+void cancel_test(void);
 
 /* timedwait.c **************************************************************/
 
-extern void timedwait_test(void);
+void timedwait_test(void);
 
 /* sighand.c ****************************************************************/
 
-extern void sighand_test(void);
+void sighand_test(void);
 
 /* posixtimers.c ************************************************************/
 
-extern void timer_test(void);
+void timer_test(void);
 
 /* roundrobin.c *************************************************************/
 
-extern void rr_test(void);
+void rr_test(void);
 
 /* barrier.c ****************************************************************/
 
-extern void barrier_test(void);
+void barrier_test(void);
 
 /* prioinherit.c ************************************************************/
 
-extern void priority_inheritance(void);
+void priority_inheritance(void);
 
 /* vfork.c ******************************************************************/
 
 #ifdef CONFIG_ARCH_HAVE_VFORK
-extern int vfork_test(void);
+int vfork_test(void);
 #endif
 
 /* APIs exported (conditionally) by the OS specifically for testing of
@@ -174,8 +180,8 @@ extern int vfork_test(void);
  */
 
 #if defined(CONFIG_DEBUG) && defined(CONFIG_PRIORITY_INHERITANCE) && defined(CONFIG_SEM_PHDEBUG)
-extern void sem_enumholders(FAR sem_t *sem);
+void sem_enumholders(FAR sem_t *sem);
-extern int sem_nfreeholders(void);
+int sem_nfreeholders(void);
 #else
 #  define sem_enumholders(sem)
 #  define sem_nfreeholders()

examples/ostest/ostest_main.c

@@ -301,6 +301,14 @@ static int user_main(int argc, char *argv[])
       check_test_memory_usage();
 #endif
 
+#ifdef CONFIG_SCHED_WAITPID
+      /* Check waitpid() and friends */
+
+      printf("\nuser_main: waitpid test\n");
+      waitpid_test();
+      check_test_memory_usage();
+#endif
+
 #ifndef CONFIG_DISABLE_PTHREAD
       /* Verify pthreads and pthread mutex */
 

examples/ostest/waitpid.c

@@ -0,0 +1,269 @@
+/****************************************************************************
+ * examples/ostest/waitpid.c
+ *
+ *   Copyright (C) 2013 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/wait.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+
+#include "ostest.h"
+
+#ifdef CONFIG_SCHED_WAITPID
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define RETURN_STATUS 14
+#define NCHILDREN     3
+#define PRIORITY      100
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static int g_waitpids[NCHILDREN];
+
+/****************************************************************************
+ * Priviate Functions
+ ****************************************************************************/
+
+static int waitpid_main(int argc, char *argv[])
+{
+  pid_t me = getpid();
+
+  printf("waitpid_main: PID %d Started\n", me);
+  sleep(3);
+  printf("waitpid_main: PID %d exitting with result=%d\n", me, RETURN_STATUS);
+  return RETURN_STATUS;
+}
+
+static void waitpid_start_children(void)
+{
+  int ret;
+  int i;
+
+  for (i = 0; i < NCHILDREN; i++)
+    {
+      ret = TASK_CREATE("waitpid", PRIORITY, STACKSIZE, waitpid_main, NULL);
+      if (ret < 0)
+        {
+          printf("waitpid_start_child: ERROR Failed to start user_main\n");
+        }
+      else
+        {
+          printf("waitpid_start_child: Started waitpid_main at PID=%d\n", ret);
+        }
+
+      g_waitpids[i] = ret;
+    }
+}
+
+static void waitpid_last(void)
+{
+  int stat_loc;
+  int ret;
+
+  printf("waitpid_last: Waiting for PID=%d with waitpid()\n",
+         g_waitpids[NCHILDREN-1]);
+
+  ret = (int)waitpid(g_waitpids[NCHILDREN-1], &stat_loc, 0);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      printf("waitpid_last: ERROR: PID %d waitpid failed: %d\n",
+             g_waitpids[NCHILDREN-1], errcode);
+    }
+  else if (stat_loc != RETURN_STATUS)
+    {
+      printf("waitpid_last: ERROR: PID %d return status is %d, expected %d\n",
+             g_waitpids[NCHILDREN-1], stat_loc, RETURN_STATUS);
+    }
+  else
+    {
+      printf("waitpid_last: PID %d waitpid succeeded with stat_loc=%d\n",
+             g_waitpids[NCHILDREN-1], stat_loc);
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int waitpid_test(void)
+{
+#ifdef CONFIG_SCHED_HAVE_PARENT
+  siginfo_t info;
+#endif
+  int stat_loc;
+  int ret;
+
+  /* Start the children and wait for first one to complete */
+
+  printf("\nTest waitpid()\n");
+  waitpid_start_children();
+
+  printf("waitpid_test: Waiting for PID=%d with waitpid()\n", g_waitpids[0]);
+  ret = (int)waitpid(g_waitpids[0], &stat_loc, 0);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      printf("waitpid_test: ERROR: PID %d waitpid failed: %d\n",
+             g_waitpids[0], errcode);
+    }
+  else if (ret != g_waitpids[0])
+    {
+      printf("waitpid_test: ERROR: PID %d wait returned PID %d\n",
+             g_waitpids[0], ret);
+    }
+  else if (stat_loc != RETURN_STATUS)
+    {
+      printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
+             g_waitpids[0], stat_loc, RETURN_STATUS);
+    }
+  else
+    {
+      printf("waitpid_test: PID %d waitpid succeeded with stat_loc=%d\n",
+             g_waitpids[0], stat_loc);
+    }
+
+  /* Wait a big to make sure that the other threads complete */
+
+  waitpid_last();
+  sleep(1);
+
+#ifdef CONFIG_SCHED_HAVE_PARENT
+  /* Start the children and wait for first one to complete */
+
+  printf("\nTest waitid(P_PID)\n");
+  waitpid_start_children();
+
+  printf("waitpid_test: Waiting for PID=%d with waitid()\n", g_waitpids[0]);
+  ret = waitid(P_PID, (id_t)g_waitpids[0], &info, WEXITED);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      printf("waitpid_test: ERROR: PID %d waitid failed: %d\n",
+             g_waitpids[0], errcode);
+    }
+  else if (info.si_pid != g_waitpids[0])
+    {
+      printf("waitpid_test: ERROR: PID %d waitid returned PID %d\n",
+             g_waitpids[0], info.si_pid);
+    }
+  else if (info.si_status != RETURN_STATUS)
+    {
+      printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
+             info.si_pid, info.si_status, RETURN_STATUS);
+    }
+  else
+    {
+      printf("waitpid_test: waitid PID %d succeeded with si_status=%d\n",
+             info.si_pid, info.si_status);
+    }
+
+  /* Wait a big to make sure that the other threads complete */
+
+  waitpid_last();
+  sleep(1);
+
+  /* Start the children and wait for any one to complete */
+
+  printf("\nTest waitid(P_ALL)\n");
+  waitpid_start_children();
+
+  printf("waitpid_test: Waiting for any child with waitid()\n");
+  ret = waitid(P_ALL, 0, &info, WEXITED);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      printf("waitpid_test: ERROR: waitid failed: %d\n", errcode);
+    }
+  else if (info.si_status != RETURN_STATUS)
+    {
+      printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
+             info.si_pid, info.si_status, RETURN_STATUS);
+    }
+  else
+    {
+      printf("waitpid_test: PID %d waitid succeeded with si_status=%d\n",
+             info.si_pid, info.si_status);
+    }
+
+  /* Wait a big to make sure that the other threads complete */
+
+  waitpid_last();
+  sleep(1);
+
+  /* Start the children and wait for first one to complete */
+
+  printf("\nTest wait()\n");
+  waitpid_start_children();
+
+  printf("waitpid_test: Waiting for any child with wait()\n");
+  ret = (int)wait(&stat_loc);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      printf("waitpid_test: ERROR: wait failed: %d\n", errcode);
+    }
+  else if (stat_loc != RETURN_STATUS)
+    {
+      printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
+             ret, stat_loc, RETURN_STATUS);
+    }
+  else
+    {
+      printf("waitpid_test: PID %d wait succeeded with stat_loc=%d\n",
+             ret, stat_loc);
+    }
+
+  /* Wait a big to make sure that the other threads complete */
+
+  waitpid_last();
+  sleep(1);
+#endif
+
+  return 0;
+}
+
+#endif /* CONFIG_SCHED_WAITPID */