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Diffstat (limited to 'nuttx/sched/sched_setuptaskfiles.c')
| -rw-r--r-- | nuttx/sched/sched_setuptaskfiles.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/nuttx/sched/sched_setuptaskfiles.c b/nuttx/sched/sched_setuptaskfiles.c new file mode 100644 index 000000000..7f754e151 --- /dev/null +++ b/nuttx/sched/sched_setuptaskfiles.c @@ -0,0 +1,248 @@ +/**************************************************************************** + * sched/sched_setuptaskfiles.c + * + * Copyright (C) 2007-2008, 2010, 2012 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 "os_internal.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. + * + * Return Value: + * None + * + ****************************************************************************/ + +#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_FDCLONE_DISABLE) +static inline void sched_dupfiles(FAR _TCB *tcb) +{ + /* The parent task is the one at the head of the ready-to-run list */ + + FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; + FAR struct file *parent; + FAR struct file *child; + int i; + + /* 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. + */ + + if (rtcb->filelist) + { + /* Get pointers to the parent and child task file lists */ + + parent = rtcb->filelist->fl_files; + child = tcb->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)files_dup(&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. + * + * Return Value: + * None + * + ****************************************************************************/ + +#if CONFIG_NSOCKET_DESCRIPTORS > 0 && !defined(CONFIG_SDCLONE_DISABLE) +static inline void sched_dupsockets(FAR _TCB *tcb) +{ + /* The parent task is the one at the head of the ready-to-run list */ + + FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; + FAR struct sockets *parent; + FAR struct sockets *child; + int i; + + /* Duplicate the socket descriptors of all sockets opened by the parent + * task. + */ + + if (rtcb->sockets) + { + /* Get pointers to the parent and child task socket lists */ + + parent = rtcb->sockets->sl_sockets; + child = tcb->sockets->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: sched_setuptaskfiles + * + * Description: + * Configure a newly allocated TCB so that it will inherit + * file descriptors and streams from the parent task. + * + * Parameters: + * tcb - tcb of the new task. + * + * Return Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +int sched_setuptaskfiles(FAR _TCB *tcb) +{ + /* Allocate file descriptors for the TCB */ + +#if CONFIG_NFILE_DESCRIPTORS > 0 + tcb->filelist = files_alloclist(); + if (!tcb->filelist) + { + return -ENOMEM; + } +#endif + + /* Allocate socket descriptors for the TCB */ + +#if CONFIG_NSOCKET_DESCRIPTORS > 0 + tcb->sockets = net_alloclist(); + if (!tcb->sockets) + { + return -ENOMEM; + } +#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 sched_setupstreams(tcb); +#else + return OK; +#endif +} + +#endif /* CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0*/ |