You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
4.0 KiB
124 lines
4.0 KiB
/**************************************************************************** |
|
* sched/env_dup.c |
|
* |
|
* Copyright (C) 2007, 2009, 2011, 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> |
|
|
|
#ifndef CONFIG_DISABLE_ENVIRON |
|
|
|
#include <sys/types.h> |
|
#include <sched.h> |
|
#include <string.h> |
|
#include <errno.h> |
|
|
|
#include <nuttx/kmalloc.h> |
|
|
|
#include "os_internal.h" |
|
#include "env_internal.h" |
|
|
|
/**************************************************************************** |
|
* Private Data |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Name: env_dup |
|
* |
|
* Description: |
|
* Copy the internal environment structure of a task. This is the action |
|
* that is performed when a new task is created: The new task has a private, |
|
* exact duplicate of the parent task's environment. |
|
* |
|
* Parameters: |
|
* group The child task group to receive the newly allocated copy of the |
|
* parent task groups environment structure. |
|
* |
|
* Return Value: |
|
* zero on success |
|
* |
|
* Assumptions: |
|
* Not called from an interrupt handler. |
|
* |
|
****************************************************************************/ |
|
|
|
int env_dup(FAR struct task_group_s *group) |
|
{ |
|
FAR _TCB *ptcb = (FAR _TCB*)g_readytorun.head; |
|
FAR char *envp = NULL; |
|
size_t envlen; |
|
int ret = OK; |
|
|
|
DEBUGASSERT(group && ptcb && ptcb->group); |
|
|
|
/* Pre-emption must be disabled throughout the following because the |
|
* environment may be shared. |
|
*/ |
|
|
|
sched_lock(); |
|
|
|
/* Does the parent task have an environment? */ |
|
|
|
if (ptcb->group && ptcb->group->tg_envp) |
|
{ |
|
/* Yes..The parent task has an environment, duplicate it */ |
|
|
|
envlen = ptcb->group->tg_envsize; |
|
envp = (FAR char *)kmalloc(envlen); |
|
if (!envp) |
|
{ |
|
ret = -ENOMEM; |
|
} |
|
else |
|
{ |
|
group->tg_envsize = envlen; |
|
group->tg_envp = envp; |
|
memcpy(envp, ptcb->group->tg_envp, envlen); |
|
} |
|
} |
|
|
|
sched_unlock(); |
|
return ret; |
|
} |
|
|
|
#endif /* CONFIG_DISABLE_ENVIRON */ |
|
|
|
|
|
|
|
|