examples/ostest/waitpid.c - nuttx-apps - Git at Google

 /****************************************************************************
  * 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
  ****************************************************************************/

 #ifdef CONFIG_BUILD_KERNEL
 int main(int argc, FAR char *argv[])
 #else
 static int waitpid_main(int argc, char *argv[])
 #endif
 {
   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 waitpid_main\n");
         }
       else
         {
           printf("waitpid_start_child: Started waitpid_main at PID=%d\n", ret);
         }

       g_waitpids[i] = ret;
     }
 }

 static void waitpid_last(void)
 {
   pid_t pid = -1;
   int stat_loc;
   int ret;
   int i;

   /* Find the last child thread that was started successfully */

   for (i = NCHILDREN-1; i > 0; i--)
     {
       if (g_waitpids[i] >= 0)
         {
           pid = i;
           break;
         }
     }

   /* Is there any thread to wait for? */

   if (pid < 0)
     {
       printf("waitpid_last: ERROR: Nothing to wait for\n");
       return;
     }

   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;

       /* Unfortunately, this main thread does not retain child status.  If
        * child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
        * disables the feature by calling sigactin with SA_NOCLDWAIT.
        */

       if (errcode == ECHILD)
         {
           printf("waitpid_last: PASS: PID %d waitpid failed with ECHILD.  That may be\n",
                  g_waitpids[NCHILDREN-1]);
           printf("              acceptable because child status is disabled on this thread.\n");
         }
       else
         {
           printf("waitpid_last: ERROR: PID %d waitpid failed: %d\n",
                  g_waitpids[NCHILDREN-1], errcode);
         }
     }
   else if (WEXITSTATUS(stat_loc) != RETURN_STATUS)
     {
       printf("waitpid_last: ERROR: PID %d return status is %d, expected %d\n",
              g_waitpids[NCHILDREN-1], WEXITSTATUS(stat_loc), RETURN_STATUS);
     }
   else
     {
       printf("waitpid_last: PASS: PID %d waitpid succeeded with stat_loc=%04x\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;

       /* Unfortunately, this main thread does not retain child status.  If
        * child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
        * disables the feature by calling sigactin with SA_NOCLDWAIT.
        */

       if (errcode == ECHILD)
         {
           printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD.  That may be\n",
                  g_waitpids[NCHILDREN-1]);
           printf("              acceptable because child status is disabled on this thread.\n");
         }
       else
         {
           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 (WEXITSTATUS(stat_loc) != RETURN_STATUS)
     {
       printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
              g_waitpids[0], WEXITSTATUS(stat_loc), RETURN_STATUS);
     }
   else
     {
       printf("waitpid_test: PID %d waitpid succeeded with stat_loc=%04x\n",
              g_waitpids[0], stat_loc);
     }

   /* Wait a bit 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;

       /* Unfortunately, this main thread does not retain child status.  If
        * child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
        * disables the feature by calling sigactin with SA_NOCLDWAIT.
        */

       if (errcode == ECHILD)
         {
           printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD.  That may be\n",
                  g_waitpids[NCHILDREN-1]);
           printf("              acceptable because child status is disabled on this thread.\n");
         }
       else
         {
           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 bit 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;

       /* Unfortunately, this main thread does not retain child status.  If
        * child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
        * disables the feature by calling sigactin with SA_NOCLDWAIT.
        */

       if (errcode == ECHILD)
         {
           printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD.  That may be\n",
                  g_waitpids[NCHILDREN-1]);
           printf("              acceptable because child status is disabled on this thread.\n");
         }
       else
         {
           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 bit 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;

       /* Unfortunately, this main thread does not retain child status.  If
        * child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
        * disables the feature by calling sigactin with SA_NOCLDWAIT.
        */

       if (errcode == ECHILD)
         {
           printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD.  That may be\n",
                  g_waitpids[NCHILDREN-1]);
           printf("              acceptable because child status is disabled on this thread.\n");
         }
       else
         {
           printf("waitpid_test: ERROR: wait failed: %d\n", errcode);
         }
     }
   else if (WEXITSTATUS(stat_loc) != RETURN_STATUS)
     {
       printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
              ret, WEXITSTATUS(stat_loc), RETURN_STATUS);
     }
   else
     {
       printf("waitpid_test: PID %d wait succeeded with stat_loc=%04x\n",
              ret, stat_loc);
     }

   /* Wait a bit to make sure that the other threads complete */

   waitpid_last();
   sleep(1);
 #endif

   return 0;
 }

 #endif /* CONFIG_SCHED_WAITPID */
	/****************************************************************************
	* 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
	****************************************************************************/

	#ifdef CONFIG_BUILD_KERNEL
	int main(int argc, FAR char *argv[])
	#else
	static int waitpid_main(int argc, char *argv[])
	#endif
	{
	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 waitpid_main\n");
	}
	else
	{
	printf("waitpid_start_child: Started waitpid_main at PID=%d\n", ret);
	}

	g_waitpids[i] = ret;
	}
	}

	static void waitpid_last(void)
	{
	pid_t pid = -1;
	int stat_loc;
	int ret;
	int i;

	/* Find the last child thread that was started successfully */

	for (i = NCHILDREN-1; i > 0; i--)
	{
	if (g_waitpids[i] >= 0)
	{
	pid = i;
	break;
	}
	}

	/* Is there any thread to wait for? */

	if (pid < 0)
	{
	printf("waitpid_last: ERROR: Nothing to wait for\n");
	return;
	}

	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;

	/* Unfortunately, this main thread does not retain child status. If
	* child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
	* disables the feature by calling sigactin with SA_NOCLDWAIT.
	*/

	if (errcode == ECHILD)
	{
	printf("waitpid_last: PASS: PID %d waitpid failed with ECHILD. That may be\n",
	g_waitpids[NCHILDREN-1]);
	printf(" acceptable because child status is disabled on this thread.\n");
	}
	else
	{
	printf("waitpid_last: ERROR: PID %d waitpid failed: %d\n",
	g_waitpids[NCHILDREN-1], errcode);
	}
	}
	else if (WEXITSTATUS(stat_loc) != RETURN_STATUS)
	{
	printf("waitpid_last: ERROR: PID %d return status is %d, expected %d\n",
	g_waitpids[NCHILDREN-1], WEXITSTATUS(stat_loc), RETURN_STATUS);
	}
	else
	{
	printf("waitpid_last: PASS: PID %d waitpid succeeded with stat_loc=%04x\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;

	/* Unfortunately, this main thread does not retain child status. If
	* child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
	* disables the feature by calling sigactin with SA_NOCLDWAIT.
	*/

	if (errcode == ECHILD)
	{
	printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD. That may be\n",
	g_waitpids[NCHILDREN-1]);
	printf(" acceptable because child status is disabled on this thread.\n");
	}
	else
	{
	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 (WEXITSTATUS(stat_loc) != RETURN_STATUS)
	{
	printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
	g_waitpids[0], WEXITSTATUS(stat_loc), RETURN_STATUS);
	}
	else
	{
	printf("waitpid_test: PID %d waitpid succeeded with stat_loc=%04x\n",
	g_waitpids[0], stat_loc);
	}

	/* Wait a bit 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;

	/* Unfortunately, this main thread does not retain child status. If
	* child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
	* disables the feature by calling sigactin with SA_NOCLDWAIT.
	*/

	if (errcode == ECHILD)
	{
	printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD. That may be\n",
	g_waitpids[NCHILDREN-1]);
	printf(" acceptable because child status is disabled on this thread.\n");
	}
	else
	{
	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 bit 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;

	/* Unfortunately, this main thread does not retain child status. If
	* child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
	* disables the feature by calling sigactin with SA_NOCLDWAIT.
	*/

	if (errcode == ECHILD)
	{
	printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD. That may be\n",
	g_waitpids[NCHILDREN-1]);
	printf(" acceptable because child status is disabled on this thread.\n");
	}
	else
	{
	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 bit 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;

	/* Unfortunately, this main thread does not retain child status. If
	* child status is enabled (via CONFIG_SCHED_CHILD_STATUS), ostest_main()
	* disables the feature by calling sigactin with SA_NOCLDWAIT.
	*/

	if (errcode == ECHILD)
	{
	printf("waitpid_test: PASS: PID %d waitpid failed with ECHILD. That may be\n",
	g_waitpids[NCHILDREN-1]);
	printf(" acceptable because child status is disabled on this thread.\n");
	}
	else
	{
	printf("waitpid_test: ERROR: wait failed: %d\n", errcode);
	}
	}
	else if (WEXITSTATUS(stat_loc) != RETURN_STATUS)
	{
	printf("waitpid_test: ERROR: PID %d return status is %d, expected %d\n",
	ret, WEXITSTATUS(stat_loc), RETURN_STATUS);
	}
	else
	{
	printf("waitpid_test: PID %d wait succeeded with stat_loc=%04x\n",
	ret, stat_loc);
	}

	/* Wait a bit to make sure that the other threads complete */

	waitpid_last();
	sleep(1);
	#endif

	return 0;
	}

	#endif /* CONFIG_SCHED_WAITPID */