107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/****************************************************************************
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* sched/sched/sched_get_stackinfo.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/types.h>
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#include <assert.h>
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#include "nuttx/sched.h"
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsched_get_stackinfo
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*
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* Description:
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* Report information about a thread's stack allocation.
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*
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* Input Parameters:
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* pid - Identifies the thread to query. Zero is interpreted as the
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* the calling thread, -1 is interpreted as the calling task.
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* stackinfo - User-provided location to return the stack information.
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*
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* Returned Value:
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* Zero (OK) if successful. Otherwise, a negated errno value is returned.
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*
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* -ENOENT Returned if pid does not refer to an active task
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* -EACCES The calling thread does not have privileges to access the
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* stack of the thread associated with the pid.
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*
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****************************************************************************/
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int nxsched_get_stackinfo(pid_t pid, FAR struct stackinfo_s *stackinfo)
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{
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FAR struct tcb_s *rtcb = this_task(); /* TCB of running task */
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FAR struct tcb_s *qtcb; /* TCB of queried task */
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DEBUGASSERT(rtcb != NULL && stackinfo != NULL);
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/* Pid of 0 means that we are querying ourself */
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if (pid == 0)
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{
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/* We can always query ourself */
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qtcb = rtcb;
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}
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else
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{
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/* Get the task to be queried */
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qtcb = nxsched_get_tcb(pid);
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if (qtcb == NULL)
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{
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return -ENOENT;
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}
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/* A kernel thread can query any other thread. Application threads
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* can only query application threads in the same task group.
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*/
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if ((rtcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
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{
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/* It is an application thread. It is permitted to query
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* only threads within the same task group. It is not permitted
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* to peek into the stacks of either kernel threads or other
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* applications tasks.
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*/
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if (rtcb->group != qtcb->group)
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{
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return -EACCES;
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}
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}
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}
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stackinfo->adj_stack_size = qtcb->adj_stack_size;
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stackinfo->stack_alloc_ptr = qtcb->stack_alloc_ptr;
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stackinfo->stack_base_ptr = qtcb->stack_base_ptr;
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return OK;
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}
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