2013-01-07 20:35:47 +01:00
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/****************************************************************************
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2021-03-08 22:39:04 +01:00
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* sched/task/task_vfork.c
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2013-01-07 20:35:47 +01:00
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*
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2020-05-16 17:06:29 +02:00
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2013-01-07 20:35:47 +01:00
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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 <nuttx/config.h>
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2013-01-27 20:17:56 +01:00
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#include <sys/wait.h>
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2013-01-07 20:35:47 +01:00
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#include <stdint.h>
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2016-11-19 14:30:01 +01:00
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#include <sched.h>
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2014-10-06 00:58:52 +02:00
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#include <string.h>
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2013-01-07 20:35:47 +01:00
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#include <assert.h>
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#include <errno.h>
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2014-10-06 00:58:52 +02:00
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#include <queue.h>
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2013-01-07 22:41:20 +01:00
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#include <debug.h>
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2013-01-07 20:35:47 +01:00
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#include <nuttx/sched.h>
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2021-04-12 17:44:08 +02:00
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#include <nuttx/tls.h>
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2013-01-07 20:35:47 +01:00
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2014-08-09 01:53:55 +02:00
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#include "sched/sched.h"
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2022-04-04 12:11:06 +02:00
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#include "environ/environ.h"
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2014-08-08 22:06:42 +02:00
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#include "group/group.h"
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2014-08-09 00:44:08 +02:00
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#include "task/task.h"
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2013-01-07 20:35:47 +01:00
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2013-02-08 23:53:14 +01:00
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/* vfork() requires architecture-specific support as well as waipid(). */
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#if defined(CONFIG_ARCH_HAVE_VFORK) && defined(CONFIG_SCHED_WAITPID)
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2013-01-07 20:35:47 +01:00
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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2020-05-16 17:06:29 +02:00
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* Name: nxtask_setup_vfork
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2013-01-07 20:35:47 +01:00
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*
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* Description:
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* The vfork() function has the same effect as fork(), except that the
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* behavior is undefined if the process created by vfork() either modifies
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* any data other than a variable of type pid_t used to store the return
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* value from vfork(), or returns from the function in which vfork() was
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* called, or calls any other function before successfully calling _exit()
|
2014-04-13 22:32:20 +02:00
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* or one of the exec family of functions.
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2013-01-07 20:35:47 +01:00
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*
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2014-09-29 18:45:44 +02:00
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* This function provides one step in the overall vfork() sequence: It
|
2020-03-08 13:51:38 +01:00
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* Allocates and initializes the child task's TCB. The overall sequence
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* is:
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2013-01-07 20:35:47 +01:00
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*
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2020-03-08 13:51:38 +01:00
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* 1) User code calls vfork(). vfork() is provided in
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* architecture-specific code.
|
2020-05-16 17:06:29 +02:00
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* 2) vfork()and calls nxtask_setup_vfork().
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* 3) nxtask_setup_vfork() allocates and configures the child task's TCB.
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2020-03-08 13:51:38 +01:00
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* This consists of:
|
2013-01-07 20:35:47 +01:00
|
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* - Allocation of the child task's TCB.
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* - Initialization of file descriptors and streams
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* - Configuration of environment variables
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2021-04-12 17:44:08 +02:00
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* - Allocate and initialize the stack
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2014-09-29 18:45:44 +02:00
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* - Setup the input parameters for the task.
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2021-04-12 17:44:08 +02:00
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* - Initialization of the TCB (including call to up_initial_state())
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2013-01-07 20:35:47 +01:00
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* 4) up_vfork() provides any additional operating context. up_vfork must:
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* - Initialize special values in any CPU registers that were not
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* already configured by up_initial_state()
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2020-05-16 17:06:29 +02:00
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* 5) up_vfork() then calls nxtask_start_vfork()
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* 6) nxtask_start_vfork() then executes the child thread.
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2013-01-07 20:35:47 +01:00
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*
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2014-09-29 18:45:44 +02:00
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* Input Parameters:
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2018-08-24 15:43:00 +02:00
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* retaddr - Return address
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* argsize - Location to return the argument size
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2013-01-07 20:35:47 +01:00
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*
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* Returned Value:
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2020-05-16 17:06:29 +02:00
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* Upon successful completion, nxtask_setup_vfork() returns a pointer to
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2014-09-29 18:45:44 +02:00
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* newly allocated and initialized child task's TCB. NULL is returned
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2013-01-07 20:35:47 +01:00
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* on any failure and the errno is set appropriately.
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*
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****************************************************************************/
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2021-04-12 17:44:08 +02:00
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FAR struct task_tcb_s *nxtask_setup_vfork(start_t retaddr)
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2013-01-07 20:35:47 +01:00
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{
|
2021-04-12 17:44:08 +02:00
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FAR struct tcb_s *ptcb = this_task();
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2021-11-29 04:00:27 +01:00
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FAR struct tcb_s *parent;
|
2019-07-29 23:04:39 +02:00
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FAR struct task_tcb_s *child;
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2021-11-01 19:35:52 +01:00
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FAR struct tls_info_s *info;
|
2021-04-12 17:44:08 +02:00
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size_t stack_size;
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2013-03-20 19:22:21 +01:00
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uint8_t ttype;
|
2013-01-07 20:35:47 +01:00
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int priority;
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int ret;
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2021-04-12 17:44:08 +02:00
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DEBUGASSERT(retaddr != NULL);
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2013-01-07 20:35:47 +01:00
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2013-03-20 19:22:21 +01:00
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/* Get the type of the fork'ed task (kernel or user) */
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|
2021-04-12 17:44:08 +02:00
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if ((ptcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_KERNEL)
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2013-03-20 19:22:21 +01:00
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{
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/* Fork'ed from a kernel thread */
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ttype = TCB_FLAG_TTYPE_KERNEL;
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2021-11-29 04:00:27 +01:00
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parent = ptcb;
|
2013-03-20 19:22:21 +01:00
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|
}
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else
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{
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/* Fork'ed from a user task or pthread */
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ttype = TCB_FLAG_TTYPE_TASK;
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2021-04-12 17:44:08 +02:00
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if ((ptcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_TASK)
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|
|
{
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2021-11-29 04:00:27 +01:00
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parent = ptcb;
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2021-04-12 17:44:08 +02:00
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}
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|
|
else
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|
{
|
2021-11-29 04:00:27 +01:00
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|
parent = nxsched_get_tcb(ptcb->group->tg_pid);
|
2021-04-12 17:44:08 +02:00
|
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|
if (parent == NULL)
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|
|
|
{
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|
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|
ret = -ENOENT;
|
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goto errout;
|
|
|
|
}
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|
|
|
}
|
2013-03-20 19:22:21 +01:00
|
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|
}
|
|
|
|
|
2013-01-07 20:35:47 +01:00
|
|
|
/* Allocate a TCB for the child task. */
|
|
|
|
|
2014-09-01 01:34:44 +02:00
|
|
|
child = (FAR struct task_tcb_s *)kmm_zalloc(sizeof(struct task_tcb_s));
|
2013-01-07 20:35:47 +01:00
|
|
|
if (!child)
|
|
|
|
{
|
2016-06-11 23:50:49 +02:00
|
|
|
serr("ERROR: Failed to allocate TCB\n");
|
2021-04-12 17:44:08 +02:00
|
|
|
ret = -ENOMEM;
|
|
|
|
goto errout;
|
2013-01-07 20:35:47 +01:00
|
|
|
}
|
|
|
|
|
2014-09-03 22:58:24 +02:00
|
|
|
/* Allocate a new task group with the same privileges as the parent */
|
2013-02-08 22:42:23 +01:00
|
|
|
|
2021-04-12 17:44:08 +02:00
|
|
|
ret = group_allocate(child, ttype);
|
2013-02-08 22:42:23 +01:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
2022-04-04 12:11:06 +02:00
|
|
|
|
|
|
|
/* Duplicate the parent tasks environment */
|
|
|
|
|
2022-04-21 13:22:10 +02:00
|
|
|
ret = env_dup(child->cmn.group, environ);
|
2022-04-04 12:11:06 +02:00
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
2013-02-08 22:42:23 +01:00
|
|
|
|
2013-01-07 20:35:47 +01:00
|
|
|
/* Associate file descriptors with the new task */
|
|
|
|
|
2013-01-27 00:49:02 +01:00
|
|
|
ret = group_setuptaskfiles(child);
|
2013-02-08 22:42:23 +01:00
|
|
|
if (ret < OK)
|
2013-01-07 20:35:47 +01:00
|
|
|
{
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
|
|
|
|
2021-04-12 17:44:08 +02:00
|
|
|
/* Allocate the stack for the TCB */
|
|
|
|
|
|
|
|
stack_size = (uintptr_t)ptcb->stack_base_ptr -
|
|
|
|
(uintptr_t)ptcb->stack_alloc_ptr + ptcb->adj_stack_size;
|
|
|
|
|
|
|
|
ret = up_create_stack(&child->cmn, stack_size, ttype);
|
|
|
|
if (ret < OK)
|
|
|
|
{
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Setup thread local storage */
|
|
|
|
|
2021-12-03 14:35:39 +01:00
|
|
|
info = up_stack_frame(&child->cmn, up_tls_size());
|
2021-04-12 17:44:08 +02:00
|
|
|
if (info == NULL)
|
|
|
|
{
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
|
|
|
|
|
|
|
DEBUGASSERT(info == child->cmn.stack_alloc_ptr);
|
2021-11-29 04:00:27 +01:00
|
|
|
memcpy(info, parent->stack_alloc_ptr, sizeof(struct tls_info_s));
|
2021-11-01 19:35:52 +01:00
|
|
|
info->tl_task = child->cmn.group->tg_info;
|
2021-04-12 17:44:08 +02:00
|
|
|
|
2021-12-03 14:35:39 +01:00
|
|
|
up_tls_initialize(info);
|
|
|
|
|
2013-01-07 20:35:47 +01:00
|
|
|
/* Get the priority of the parent task */
|
|
|
|
|
|
|
|
#ifdef CONFIG_PRIORITY_INHERITANCE
|
2021-04-12 17:44:08 +02:00
|
|
|
priority = ptcb->base_priority; /* "Normal," unboosted priority */
|
2013-01-07 20:35:47 +01:00
|
|
|
#else
|
2021-04-12 17:44:08 +02:00
|
|
|
priority = ptcb->sched_priority; /* Current priority */
|
2013-01-07 20:35:47 +01:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Initialize the task control block. This calls up_initial_state() */
|
|
|
|
|
2016-06-11 19:59:51 +02:00
|
|
|
sinfo("Child priority=%d start=%p\n", priority, retaddr);
|
2021-04-12 17:44:08 +02:00
|
|
|
ret = nxtask_setup_scheduler(child, priority, retaddr,
|
|
|
|
ptcb->entry.main, ttype);
|
2013-02-08 22:42:23 +01:00
|
|
|
if (ret < OK)
|
2013-01-07 20:35:47 +01:00
|
|
|
{
|
|
|
|
goto errout_with_tcb;
|
|
|
|
}
|
|
|
|
|
2021-04-12 17:44:08 +02:00
|
|
|
/* Setup to pass parameters to the new task */
|
|
|
|
|
2021-11-29 04:00:27 +01:00
|
|
|
nxtask_setup_arguments(child, parent->group->tg_info->argv[0],
|
|
|
|
&parent->group->tg_info->argv[1]);
|
2021-04-12 17:44:08 +02:00
|
|
|
|
|
|
|
/* Now we have enough in place that we can join the group */
|
2018-08-24 15:43:00 +02:00
|
|
|
|
2022-03-01 19:24:05 +01:00
|
|
|
group_initialize(child);
|
2016-06-11 19:59:51 +02:00
|
|
|
sinfo("parent=%p, returning child=%p\n", parent, child);
|
2013-02-07 17:58:43 +01:00
|
|
|
return child;
|
2013-01-07 20:35:47 +01:00
|
|
|
|
|
|
|
errout_with_tcb:
|
2020-05-09 16:04:45 +02:00
|
|
|
nxsched_release_tcb((FAR struct tcb_s *)child, ttype);
|
2021-04-12 17:44:08 +02:00
|
|
|
errout:
|
2013-01-07 20:35:47 +01:00
|
|
|
set_errno(-ret);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2020-05-16 17:06:29 +02:00
|
|
|
* Name: nxtask_start_vfork
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* The vfork() function has the same effect as fork(), except that the
|
|
|
|
* behavior is undefined if the process created by vfork() either modifies
|
|
|
|
* any data other than a variable of type pid_t used to store the return
|
|
|
|
* value from vfork(), or returns from the function in which vfork() was
|
|
|
|
* called, or calls any other function before successfully calling _exit()
|
2014-04-13 22:32:20 +02:00
|
|
|
* or one of the exec family of functions.
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
2014-09-29 18:45:44 +02:00
|
|
|
* This function provides one step in the overall vfork() sequence: It
|
2013-01-07 20:35:47 +01:00
|
|
|
* starts execution of the previously initialized TCB. The overall
|
|
|
|
* sequence is:
|
|
|
|
*
|
|
|
|
* 1) User code calls vfork()
|
This commit renames all internal OS functions defined under sched/task so that they begin with the prefix. For example, nxtask_exit() vs. task_exit().
Squashed commit of the following:
Trivial, cosmetic
sched/, arch/, and include: Rename task_vforkstart() as nxtask_vforkstart()
sched/, arch/, and include: Rename task_vforkabort() as nxtask_vforkabort()
sched/, arch/, and include: Rename task_vforksetup() as nxtask_vfork_setup()
sched/: Rename notify_cancellation() as nxnotify_cancellation()
sched/: Rename task_recover() to nxtask_recover()
sched/task, sched/pthread/, Documentation/: Rename task_argsetup() and task_terminate() to nxtask_argsetup() and nxtask_terminate(), respectively.
sched/task: Rename task_schedsetup() to nxtask_schedsetup()
sched/ (plus some binfmt/, include/, and arch/): Rename task_start() and task_starthook() to nxtask_start() and nxtask_starthook().
arch/ and sched/: Rename task_exit() and task_exithook() to nxtask_exit() and nxtask_exithook(), respectively.
sched/task: Rename all internal, static, functions to begin with the nx prefix.
2019-02-04 20:42:51 +01:00
|
|
|
* 2) Architecture-specific code provides vfork()and calls
|
2020-05-16 17:06:29 +02:00
|
|
|
* nxtask_setup_vfork().
|
|
|
|
* 3) nxtask_setup_vfork() allocates and configures the child task's TCB.
|
This commit renames all internal OS functions defined under sched/task so that they begin with the prefix. For example, nxtask_exit() vs. task_exit().
Squashed commit of the following:
Trivial, cosmetic
sched/, arch/, and include: Rename task_vforkstart() as nxtask_vforkstart()
sched/, arch/, and include: Rename task_vforkabort() as nxtask_vforkabort()
sched/, arch/, and include: Rename task_vforksetup() as nxtask_vfork_setup()
sched/: Rename notify_cancellation() as nxnotify_cancellation()
sched/: Rename task_recover() to nxtask_recover()
sched/task, sched/pthread/, Documentation/: Rename task_argsetup() and task_terminate() to nxtask_argsetup() and nxtask_terminate(), respectively.
sched/task: Rename task_schedsetup() to nxtask_schedsetup()
sched/ (plus some binfmt/, include/, and arch/): Rename task_start() and task_starthook() to nxtask_start() and nxtask_starthook().
arch/ and sched/: Rename task_exit() and task_exithook() to nxtask_exit() and nxtask_exithook(), respectively.
sched/task: Rename all internal, static, functions to begin with the nx prefix.
2019-02-04 20:42:51 +01:00
|
|
|
* This consists of:
|
2013-01-07 20:35:47 +01:00
|
|
|
* - Allocation of the child task's TCB.
|
|
|
|
* - Initialization of file descriptors and streams
|
|
|
|
* - Configuration of environment variables
|
2021-04-12 17:44:08 +02:00
|
|
|
* - Allocate and initialize the stack
|
2014-09-29 18:45:44 +02:00
|
|
|
* - Setup the input parameters for the task.
|
2021-04-12 17:44:08 +02:00
|
|
|
* - Initialization of the TCB (including call to up_initial_state())
|
2013-01-07 20:35:47 +01:00
|
|
|
* 4) vfork() provides any additional operating context. vfork must:
|
|
|
|
* - Initialize special values in any CPU registers that were not
|
|
|
|
* already configured by up_initial_state()
|
2020-05-16 17:06:29 +02:00
|
|
|
* 5) vfork() then calls nxtask_start_vfork()
|
|
|
|
* 6) nxtask_start_vfork() then executes the child thread.
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
2014-09-29 18:45:44 +02:00
|
|
|
* Input Parameters:
|
2013-01-07 20:35:47 +01:00
|
|
|
* retaddr - The return address from vfork() where the child task
|
|
|
|
* will be started.
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Upon successful completion, vfork() returns 0 to the child process and
|
|
|
|
* returns the process ID of the child process to the parent process.
|
|
|
|
* Otherwise, -1 is returned to the parent, no child process is created,
|
2014-04-13 22:32:20 +02:00
|
|
|
* and errno is set to indicate the error.
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2020-05-16 17:06:29 +02:00
|
|
|
pid_t nxtask_start_vfork(FAR struct task_tcb_s *child)
|
2013-01-07 20:35:47 +01:00
|
|
|
{
|
|
|
|
pid_t pid;
|
2021-04-12 17:44:08 +02:00
|
|
|
int rc = 0;
|
2013-01-07 20:35:47 +01:00
|
|
|
int ret;
|
|
|
|
|
2021-04-12 17:44:08 +02:00
|
|
|
sinfo("Starting Child TCB=%p\n", child);
|
2013-01-07 20:35:47 +01:00
|
|
|
DEBUGASSERT(child);
|
|
|
|
|
|
|
|
/* Get the assigned pid before we start the task */
|
|
|
|
|
2022-03-21 23:47:09 +01:00
|
|
|
pid = child->cmn.pid;
|
2013-01-07 20:35:47 +01:00
|
|
|
|
2016-11-19 14:30:01 +01:00
|
|
|
/* Eliminate a race condition by disabling pre-emption. The child task
|
|
|
|
* can be instantiated, but cannot run until we call waitpid(). This
|
2017-05-11 21:35:56 +02:00
|
|
|
* assures us that we cannot miss the death-of-child signal (only
|
2016-11-19 14:30:01 +01:00
|
|
|
* needed in the SMP case).
|
|
|
|
*/
|
|
|
|
|
|
|
|
sched_lock();
|
|
|
|
|
2013-01-07 20:35:47 +01:00
|
|
|
/* Activate the task */
|
|
|
|
|
2020-06-04 14:19:40 +02:00
|
|
|
nxtask_activate((FAR struct tcb_s *)child);
|
2013-01-07 20:35:47 +01:00
|
|
|
|
2016-11-19 14:30:01 +01:00
|
|
|
/* The child task has not yet ran because pre-emption is disabled.
|
|
|
|
* The child task has the same priority as the parent task, so that
|
2016-11-19 15:33:55 +01:00
|
|
|
* would typically be the case anyway. However, in the SMP
|
|
|
|
* configuration, the child thread might have already ran on
|
|
|
|
* another CPU if pre-emption were not disabled.
|
2013-01-11 17:53:44 +01:00
|
|
|
*
|
2016-11-19 14:30:01 +01:00
|
|
|
* It is a requirement that the parent environment be stable while
|
|
|
|
* vfork runs; the child thread is still dependent on things in the
|
|
|
|
* parent thread... like the pointers into parent thread's stack
|
|
|
|
* which will still appear in the child's registers and environment.
|
2016-11-19 15:33:55 +01:00
|
|
|
*
|
|
|
|
* We assure that by waiting for the child thread to exit before
|
|
|
|
* returning to the parent thread. NOTE that pre-emption will be
|
|
|
|
* re-enabled while we are waiting, giving the child thread the
|
|
|
|
* opportunity to run.
|
2013-01-11 17:53:44 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
ret = waitpid(pid, &rc, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
2021-02-15 09:08:51 +01:00
|
|
|
serr("ERROR: waitpid failed: %d\n", get_errno());
|
2013-01-11 17:53:44 +01:00
|
|
|
}
|
|
|
|
|
2016-11-19 14:30:01 +01:00
|
|
|
sched_unlock();
|
2013-01-07 20:35:47 +01:00
|
|
|
return pid;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2020-05-16 17:06:29 +02:00
|
|
|
* Name: nxtask_abort_vfork
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
|
|
|
* Description:
|
2020-05-16 17:06:29 +02:00
|
|
|
* Recover from any errors after nxtask_setup_vfork() was called.
|
2013-01-07 20:35:47 +01:00
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* None
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2020-05-16 17:06:29 +02:00
|
|
|
void nxtask_abort_vfork(FAR struct task_tcb_s *child, int errcode)
|
2013-01-07 20:35:47 +01:00
|
|
|
{
|
2020-05-16 17:06:29 +02:00
|
|
|
/* The TCB was added to the active task list by nxtask_setup_scheduler() */
|
2013-01-07 20:35:47 +01:00
|
|
|
|
2015-10-08 03:59:14 +02:00
|
|
|
dq_rem((FAR dq_entry_t *)child, (FAR dq_queue_t *)&g_inactivetasks);
|
2013-01-07 20:35:47 +01:00
|
|
|
|
|
|
|
/* Release the TCB */
|
|
|
|
|
2020-05-09 16:04:45 +02:00
|
|
|
nxsched_release_tcb((FAR struct tcb_s *)child,
|
2021-04-12 17:44:08 +02:00
|
|
|
child->cmn.flags & TCB_FLAG_TTYPE_MASK);
|
2013-01-07 20:35:47 +01:00
|
|
|
set_errno(errcode);
|
2013-01-15 16:40:18 +01:00
|
|
|
}
|
2013-02-08 23:53:14 +01:00
|
|
|
|
|
|
|
#endif /* CONFIG_ARCH_HAVE_VFORK && CONFIG_SCHED_WAITPID */
|