327 lines
11 KiB
C
327 lines
11 KiB
C
/****************************************************************************
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* sched/task/task_spawn.c
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*
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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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*
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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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#include <sys/wait.h>
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#include <sched.h>
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#include <spawn.h>
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#include <assert.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/sched.h>
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#include <nuttx/kthread.h>
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#include <nuttx/spawn.h>
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#include "sched/sched.h"
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#include "group/group.h"
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#include "task/spawn.h"
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#include "task/task.h"
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#ifndef CONFIG_BUILD_KERNEL
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtask_spawn_create
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*
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* Description:
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* This function creates and activates a new thread of the specified type
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* with a specified priority and returns its system-assigned ID. It is the
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* internal, common implementation of task_create() and kthread_create().
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* See comments with task_create() for further information.
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*
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* Input Parameters:
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* name - Name of the new task
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* ttype - Type of the new task
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* priority - Priority of the new task
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* stack_addr - Address of the stack needed
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* stack_size - Size (in bytes) of the stack needed
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* entry - Entry point of a new task
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* arg - A pointer to an array of input parameters. The array
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* should be terminated with a NULL argv[] value. If no
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* parameters are required, argv may be NULL.
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* envp - A pointer to an array of environment strings. Terminated
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* with a NULL entry.
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* actions - The spawn file actions
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*
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* Returned Value:
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* Returns the positive, non-zero process ID of the new task or a negated
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* errno value to indicate the nature of any failure. If memory is
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* insufficient or the task cannot be created -ENOMEM will be returned.
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*
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****************************************************************************/
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static int nxtask_spawn_create(FAR const char *name, int priority,
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FAR void *stack_addr, int stack_size,
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main_t entry, FAR char * const argv[],
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FAR char * const envp[],
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FAR const posix_spawn_file_actions_t *actions,
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FAR const posix_spawnattr_t *attr)
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{
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FAR struct task_tcb_s *tcb;
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pid_t pid;
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int ret;
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/* Allocate a TCB for the new task. */
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tcb = kmm_zalloc(sizeof(struct task_tcb_s));
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if (tcb == NULL)
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{
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serr("ERROR: Failed to allocate TCB\n");
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return -ENOMEM;
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}
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/* Setup the task type */
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tcb->cmn.flags = TCB_FLAG_TTYPE_TASK | TCB_FLAG_FREE_TCB;
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/* Initialize the task */
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ret = nxtask_init(tcb, name, priority, stack_addr, stack_size,
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entry, argv, envp, actions);
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if (ret < OK)
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{
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kmm_free(tcb);
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return ret;
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}
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/* Get the assigned pid before we start the task */
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pid = tcb->cmn.pid;
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/* Set the attributes */
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if (attr)
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{
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ret = spawn_execattrs(pid, attr);
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if (ret < 0)
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{
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goto errout_with_taskinit;
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}
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}
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/* Activate the task */
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nxtask_activate(&tcb->cmn);
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return pid;
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errout_with_taskinit:
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nxtask_uninit(tcb);
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return ret;
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}
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/****************************************************************************
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* Name: nxtask_spawn_exec
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*
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* Description:
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* Execute the task from the file system.
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*
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* Input Parameters:
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*
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* pidp - Upon successful completion, this will return the task ID of the
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* child task in the variable pointed to by a non-NULL 'pid' argument.|
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*
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* name - The name to assign to the child task.
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*
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* entry - The child task's entry point (an address in memory)
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*
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* actions - The spawn file actions
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*
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* attr - If the value of the 'attr' parameter is NULL, the all default
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* values for the POSIX spawn attributes will be used. Otherwise, the
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* attributes will be set according to the spawn flags. The
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* following spawn flags are supported:
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*
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* - POSIX_SPAWN_SETSCHEDPARAM: Set new tasks priority to the sched_param
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* value.
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* - POSIX_SPAWN_SETSCHEDULER: Set the new tasks scheduler priority to
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* the sched_policy value.
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*
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* NOTE: POSIX_SPAWN_SETSIGMASK is handled in nxtask_spawn_proxy().
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*
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* argv - argv[] is the argument list for the new task. argv[] is an
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* array of pointers to null-terminated strings. The list is terminated
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* with a null pointer.
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*
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* envp - A pointer to an array of environment strings. Terminated with
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* a NULL entry.
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*
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* Returned Value:
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* This function will return zero on success. Otherwise, an error number
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* will be returned as the function return value to indicate the error.
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* This errno value may be that set by execv(), sched_setpolicy(), or
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* sched_setparam().
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*
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****************************************************************************/
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static int nxtask_spawn_exec(FAR pid_t *pidp, FAR const char *name,
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main_t entry,
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FAR const posix_spawn_file_actions_t *actions,
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FAR const posix_spawnattr_t *attr,
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FAR char * const *argv, FAR char * const envp[])
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{
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FAR void *stackaddr = NULL;
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size_t stacksize;
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int priority;
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int pid;
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int ret = OK;
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/* Use the default priority and stack size if no attributes are provided */
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if (attr)
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{
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priority = attr->priority;
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stacksize = attr->stacksize;
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stackaddr = attr->stackaddr;
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}
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else
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{
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struct sched_param param;
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/* Set the default priority to the same priority as this task */
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ret = nxsched_get_param(0, ¶m);
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if (ret < 0)
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{
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return ret;
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}
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priority = param.sched_priority;
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stacksize = CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE;
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}
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/* Start the task */
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pid = nxtask_spawn_create(name, priority, stackaddr,
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stacksize, entry, argv,
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envp ? envp : environ, actions, attr);
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if (pid < 0)
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{
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ret = pid;
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serr("ERROR: nxtask_spawn_create failed: %d\n", ret);
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return ret;
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}
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/* Return the task ID to the caller */
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if (pid)
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{
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*pidp = pid;
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: task_spawn
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*
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* Description:
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* The task_spawn() function will create a new, child task, where the
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* entry point to the task is an address in memory.
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*
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* Input Parameters:
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*
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* name - The name to assign to the child task.
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*
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* entry - The child task's entry point (an address in memory)
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*
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* file_actions - If 'file_actions' is a null pointer, then file
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* descriptors open in the calling process will remain open in the
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* child process (unless CONFIG_FDCLONE_STDIO is defined). If
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* 'file_actions' is not NULL, then the file descriptors open in the
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* child process will be those open in the calling process as modified
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* by the spawn file actions object pointed to by file_actions.
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*
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* attr - If the value of the 'attr' parameter is NULL, the all default
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* values for the POSIX spawn attributes will be used. Otherwise, the
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* attributes will be set according to the spawn flags. The
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* posix_spawnattr_t spawn attributes object type is defined in spawn.h.
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* It will contains these attributes, not all of which are supported by
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* NuttX:
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*
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* - POSIX_SPAWN_SETPGROUP: Setting of the new task's process group is
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* not supported. NuttX does not support process groups.
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* - POSIX_SPAWN_SETSCHEDPARAM: Set new tasks priority to the sched_param
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* value.
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* - POSIX_SPAWN_SETSCHEDULER: Set the new task's scheduler policy to
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* the sched_policy value.
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* - POSIX_SPAWN_RESETIDS: Resetting of the effective user ID of the
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* child process is not supported. NuttX does not support effective
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* user IDs.
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* - POSIX_SPAWN_SETSIGMASK: Set the new task's signal mask.
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* - POSIX_SPAWN_SETSIGDEF: Resetting signal default actions is not
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* supported. NuttX does not support default signal actions.
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*
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* And the non-standard:
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*
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* - TASK_SPAWN_SETSTACKSIZE: Set the stack size for the new task.
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*
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* argv - argv[] is the argument list for the new task. argv[] is an
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* array of pointers to null-terminated strings. The list is terminated
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* with a null pointer.
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*
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* envp - envp[] is an array of character pointers to null-terminated
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* strings that provide the environment for the new process image.
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*
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* Returned Value:
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* task_spawn() will return process ID of new task on success.
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* Otherwise, a negative number will be returned as the function return
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* value to indicate the error:
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*
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* - EINVAL: The value specified by 'file_actions' or 'attr' is invalid.
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* - Any errors that might have been return if vfork() and excec[l|v]()
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* had been called.
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*
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****************************************************************************/
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int task_spawn(FAR const char *name, main_t entry,
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FAR const posix_spawn_file_actions_t *file_actions,
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FAR const posix_spawnattr_t *attr,
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FAR char * const argv[], FAR char * const envp[])
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{
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pid_t pid = INVALID_PROCESS_ID;
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int ret;
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sinfo("name=%s entry=%p file_actions=%p attr=%p argv=%p\n",
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name, entry, file_actions, attr, argv);
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ret = nxtask_spawn_exec(&pid, name, entry,
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file_actions != NULL ? *file_actions : NULL,
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attr, argv, envp);
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return ret >= 0 ? pid : ret;
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}
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#endif /* CONFIG_BUILD_KERNEL */
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