147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/****************************************************************************
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* sched/pthread/pthread_kill.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 <signal.h>
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#include <pthread.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/sched.h>
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#include <nuttx/signal.h>
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#include "sched/sched.h"
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#include "signal/signal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_kill
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*
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* Description:
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* The pthread_kill() system call can be used to send any signal to a
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* thread. See nxsig_kill() for further information as this is just a
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* simple wrapper around the nxsig_kill() function.
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*
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* Input Parameters:
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* thread - The id of the thread to receive the signal. Only positive,
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* non-zero values of 'thread' are supported.
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* signo - The signal number to send. If 'signo' is zero, no signal is
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* sent, but all error checking is performed.
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*
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* Returned Value:
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* On success the signal was send and zero is returned. On error one
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* of the following error numbers is returned.
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*
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* EINVAL An invalid signal was specified.
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* EPERM The thread does not have permission to send the
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* signal to the target thread.
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* ESRCH No thread could be found corresponding to that
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* specified by the given thread ID
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* ENOSYS Do not support sending signals to process groups.
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*
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****************************************************************************/
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int pthread_kill(pthread_t thread, int signo)
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{
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#ifdef HAVE_GROUP_MEMBERS
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/* If group members are supported then pthread_kill() differs from
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* nxsig_kill(). nxsig_kill(), in this case, must follow the POSIX rules
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* for delivery of signals in the group environment. Otherwise,
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* nxsig_kill(), like pthread_kill() will just deliver the signal to the
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* thread ID it is requested to use.
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*/
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#ifdef CONFIG_SCHED_HAVE_PARENT
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FAR struct tcb_s *rtcb = this_task();
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#endif
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FAR struct tcb_s *stcb;
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siginfo_t info;
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int ret;
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/* Make sure that the signal is valid */
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if (!GOOD_SIGNO(signo))
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{
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ret = -EINVAL;
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goto errout;
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}
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/* Keep things stationary through the following */
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sched_lock();
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/* Create the siginfo structure */
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info.si_signo = signo;
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info.si_code = SI_USER;
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info.si_errno = EINTR;
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info.si_value.sival_ptr = NULL;
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#ifdef CONFIG_SCHED_HAVE_PARENT
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info.si_pid = rtcb->pid;
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info.si_status = OK;
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#endif
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/* Get the TCB associated with the thread */
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stcb = nxsched_get_tcb((pid_t)thread);
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if (!stcb)
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{
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ret = -ESRCH;
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goto errout_with_lock;
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}
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/* Dispatch the signal to thread, bypassing normal task group thread
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* dispatch rules.
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*/
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ret = nxsig_tcbdispatch(stcb, &info);
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sched_unlock();
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if (ret < 0)
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{
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goto errout;
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}
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return OK;
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errout_with_lock:
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sched_unlock();
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errout:
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return -ret;
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#else
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/* If group members are not supported then pthread_kill is basically the
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* same as nxsig_kill() other than the sign of the returned value.
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*/
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int ret = nxsig_kill((pid_t)thread, signo);
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return (ret < 0) ? -ret : OK;
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#endif
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}
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