nuttx/sched/pthread/pthread_kill.c

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/****************************************************************************
* sched/pthread/pthread_kill.c
*
* Copyright (C) 2007, 2009, 2011, 2015 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 <sys/types.h>
#include <signal.h>
#include <pthread.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/sched.h>
#include "sched/sched.h"
#include "signal/signal.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pthread_kill
*
* Description:
* The pthread_kill() system call can be used to send any signal to a
* thread. See kill() for further information as this is just a simple
* wrapper around the kill() function.
*
* Parameters:
* thread - The id of the thread to receive the signal. Only positive,
* non-zero values of 'thread' are supported.
* signo - The signal number to send. If 'signo' is zero, no signal is
* sent, but all error checking is performed.
*
* Return Value:
* On success the signal was send and zero is returned. On error one
* of the following error numbers is returned.
*
* EINVAL An invalid signal was specified.
* EPERM The thread does not have permission to send the
* signal to the target thread.
* ESRCH No thread could be found corresponding to that
* specified by the given thread ID
* ENOSYS Do not support sending signals to process groups.
*
* Assumptions:
*
****************************************************************************/
int pthread_kill(pthread_t thread, int signo)
{
#ifdef HAVE_GROUP_MEMBERS
/* If group members are support then pthread_kill() differs from kill().
* kill(), in this case, must following the POSIX rules for delivery of
* signals in the group environment. Otherwise, kill(), like
* pthread_kill() will just deliver the signal to the thread ID it is
* requested to use.
*/
#ifdef CONFIG_SCHED_HAVE_PARENT
FAR struct tcb_s *rtcb = (FAR struct tcb_s *)g_readytorun.head;
#endif
FAR struct tcb_s *stcb;
siginfo_t info;
int ret;
/* Make sure that the signal is valid */
if (!GOOD_SIGNO(signo))
{
ret = -EINVAL;
goto errout;
}
/* Keep things stationary through the following */
sched_lock();
/* Create the siginfo structure */
info.si_signo = signo;
info.si_code = SI_USER;
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info.si_errno = EINTR;
info.si_value.sival_ptr = NULL;
#ifdef CONFIG_SCHED_HAVE_PARENT
info.si_pid = rtcb->pid;
info.si_status = OK;
#endif
/* Get the TCB associated with the thread */
stcb = sched_gettcb((pid_t)thread);
if (!stcb)
{
ret = -ESRCH;
goto errout_with_lock;
}
/* Dispatch the signal to thread, bypassing normal task group thread
* dispatch rules.
*/
ret = sig_tcbdispatch(stcb, &info);
sched_unlock();
if (ret < 0)
{
goto errout;
}
return OK;
errout_with_lock:
sched_unlock();
errout:
return -ret;
#else
/* If group members are not supported then pthread_kill is basically the
* same as kill().
*/
int ret;
set_errno(EINVAL);
ret = kill((pid_t)thread, signo);
if (ret != OK)
{
ret = get_errno();
}
return ret;
#endif
}