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incubator-nuttx/sched/group/group_setuptaskfiles.c

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/****************************************************************************
* sched/group/group_setuptaskfiles.c
*
* Copyright (C) 2007-2008, 2010, 2012-2013 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 <sched.h>
#include <errno.h>
#include <nuttx/fs/fs.h>
#include <nuttx/net/net.h>
#include "sched/sched.h"
#include "group/group.h"
#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Determine how many file descriptors to clone. If CONFIG_FDCLONE_DISABLE
* is set, no file descriptors will be cloned. If CONFIG_FDCLONE_STDIO is
* set, only the first three descriptors (stdin, stdout, and stderr) will
* be cloned. Otherwise all file descriptors will be cloned.
*/
#if defined(CONFIG_FDCLONE_STDIO) && CONFIG_NFILE_DESCRIPTORS > 3
# define NFDS_TOCLONE 3
#else
# define NFDS_TOCLONE CONFIG_NFILE_DESCRIPTORS
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sched_dupfiles
*
* Description:
* Duplicate parent task's file descriptors.
*
* Input Parameters:
* tcb - tcb of the new task.
*
* Returned Value:
* None
*
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_FDCLONE_DISABLE)
static inline void sched_dupfiles(FAR struct task_tcb_s *tcb)
{
/* The parent task is the one at the head of the ready-to-run list */
FAR struct tcb_s *rtcb = this_task();
FAR struct file *parent;
FAR struct file *child;
int i;
DEBUGASSERT(tcb && tcb->cmn.group && rtcb->group);
/* Duplicate the file descriptors. This will be either all of the
* file descriptors or just the first three (stdin, stdout, and stderr)
* if CONFIG_FDCLONE_STDIO is defined. NFSDS_TOCLONE is set
* accordingly above.
*/
/* Get pointers to the parent and child task file lists */
parent = rtcb->group->tg_filelist.fl_files;
child = tcb->cmn.group->tg_filelist.fl_files;
/* Check each file in the parent file list */
for (i = 0; i < NFDS_TOCLONE; i++)
{
/* Check if this file is opened by the parent. We can tell if
* if the file is open because it contain a reference to a non-NULL
* i-node structure.
*/
if (parent[i].f_inode)
{
/* Yes... duplicate it for the child */
(void)file_dup2(&parent[i], &child[i]);
}
}
}
#else /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_FDCLONE_DISABLE */
# define sched_dupfiles(tcb)
#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_FDCLONE_DISABLE */
/****************************************************************************
* Name: sched_dupsockets
*
* Description:
* Duplicate the parent task's socket descriptors.
*
* Input Parameters:
* tcb - tcb of the new task.
*
* Returned Value:
* None
*
****************************************************************************/
#if CONFIG_NSOCKET_DESCRIPTORS > 0 && !defined(CONFIG_SDCLONE_DISABLE)
static inline void sched_dupsockets(FAR struct task_tcb_s *tcb)
{
/* The parent task is the one at the head of the ready-to-run list */
FAR struct tcb_s *rtcb = this_task();
FAR struct socket *parent;
FAR struct socket *child;
int i;
/* Duplicate the socket descriptors of all sockets opened by the parent
* task.
*/
DEBUGASSERT(tcb && tcb->cmn.group && rtcb->group);
/* Get pointers to the parent and child task socket lists */
parent = rtcb->group->tg_socketlist.sl_sockets;
child = tcb->cmn.group->tg_socketlist.sl_sockets;
/* Check each socket in the parent socket list */
for (i = 0; i < CONFIG_NSOCKET_DESCRIPTORS; i++)
{
/* Check if this parent socket is allocated. We can tell if the
* socket is allocated because it will have a positive, non-zero
* reference count.
*/
if (parent[i].s_crefs > 0)
{
/* Yes... duplicate it for the child */
(void)net_clone(&parent[i], &child[i]);
}
}
}
#else /* CONFIG_NSOCKET_DESCRIPTORS && !CONFIG_SDCLONE_DISABLE */
# define sched_dupsockets(tcb)
#endif /* CONFIG_NSOCKET_DESCRIPTORS && !CONFIG_SDCLONE_DISABLE */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: group_setuptaskfiles
*
* Description:
* Configure a newly allocated TCB so that it will inherit
* file descriptors and streams from the parent task.
*
* Input Parameters:
* tcb - tcb of the new task.
*
* Returned Value:
* Zero (OK) is returned on success; A negated errno value is returned on
* failure.
*
* Assumptions:
*
****************************************************************************/
int group_setuptaskfiles(FAR struct task_tcb_s *tcb)
{
#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
FAR struct task_group_s *group = tcb->cmn.group;
DEBUGASSERT(group);
#endif
#ifndef CONFIG_DISABLE_PTHREAD
DEBUGASSERT((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD);
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
/* Initialize file descriptors for the TCB */
files_initlist(&group->tg_filelist);
#endif
#if CONFIG_NSOCKET_DESCRIPTORS > 0
/* Allocate socket descriptors for the TCB */
net_initlist(&group->tg_socketlist);
#endif
/* Duplicate the parent task's file descriptors */
sched_dupfiles(tcb);
/* Duplicate the parent task's socket descriptors */
sched_dupsockets(tcb);
/* Allocate file/socket streams for the new TCB */
#if CONFIG_NFILE_STREAMS > 0
return group_setupstreams(tcb);
#else
return OK;
#endif
}
#endif /* CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0 */
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