143 lines
4.7 KiB
C
143 lines
4.7 KiB
C
/****************************************************************************
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* examples/elf/tests/task/parent.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sched.h>
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#include <semaphore.h>
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#include <errno.h>
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static char child_name[] = "child";
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static char child_arg[] = "Hello from your parent!";
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static sem_t g_sem;
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#if CONFIG_TASK_NAME_SIZE == 0
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static char no_name[] = "<noname>";
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#endif
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/****************************************************************************
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* Privite Functions
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****************************************************************************/
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/* NOTE: it is necessary for functions that are referred to by function pointers
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* pointer to be declared with global scope (at least for ARM). Otherwise,
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* a relocation type that is not supported by ELF is generated by GCC.
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*/
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int child_task(int argc, char **argv)
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{
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printf("Child: execv was successful!\n");
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printf("Child: argc=%d\n", argc);
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if (argc != 2)
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{
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printf("Child: expected argc to be 2\n");
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printf("Child: Exit-ting with status=2\n");
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exit(2);
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}
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printf("Child: argv[0]=\"%s\"\n", argv[0]);
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#if CONFIG_TASK_NAME_SIZE == 0
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if (strcmp(argv[0], no_name) != 0)
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{
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printf("Child: expected argv[0] to be \"%s\"\n", no_name);
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printf("Child: Exit-ting with status=3\n");
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exit(3);
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}
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#else
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if (strncmp(argv[0], child_name, CONFIG_TASK_NAME_SIZE) != 0)
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{
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printf("Child: expected argv[0] to be \"%s\"\n", child_name);
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printf("Child: Exit-ting with status=3\n");
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exit(3);
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}
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#endif
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printf("Child: argv[1]=\"%s\"\n", argv[1]);
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if (strcmp(argv[1], child_arg) != 0)
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{
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printf("Child: expected argv[1] to be \"%s\"\n", child_arg);
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printf("Child: Exit-ting with status=4\n");
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exit(4);
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}
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printf("Child: Exit-ting with status=0\n");
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sem_post(&g_sem);
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, char **argv)
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{
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pid_t parent_pid = getpid();
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char *child_argv[2];
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pid_t child_pid;
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printf("Parent: Started, pid=%d\n", parent_pid);
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sem_init(&g_sem, 0, 0);
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printf("Parent: Calling task_create()\n");
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child_argv[0] = child_arg;
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child_argv[1] = 0;
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child_pid = task_create(child_name, 50, 2048, child_task, (FAR char * const *)child_argv);
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if (child_pid < 0)
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{
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printf("Parent: task_create failed: %d\n", errno);
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}
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printf("Parent: Waiting for child (pid=%d)\n", child_pid);
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sem_wait(&g_sem);
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printf("Parent: Exit-ing\n");
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sem_destroy(&g_sem);
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return 0;
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}
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