196 lines
6.5 KiB
C
196 lines
6.5 KiB
C
/****************************************************************************
|
|
* sched/signal/sig_queue.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2013, 2017 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 <nuttx/compiler.h>
|
|
|
|
#include <signal.h>
|
|
#include <debug.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/signal.h>
|
|
|
|
#include "sched/sched.h"
|
|
#include "signal/signal.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: nxsig_queue
|
|
*
|
|
* Description:
|
|
* This function sends the signal specified by signo with the signal
|
|
* parameter value to the process specified by pid.
|
|
*
|
|
* If the receiving process has the signal blocked via the sigprocmask,
|
|
* the signal will pend until it is unmasked. Only one pending signal (per
|
|
* signo) is retained. This is consistent with POSIX which states, "If
|
|
* a subsequent occurrence of a pending signal is generated, it is
|
|
* implementation defined as to whether the signal is delivered more than
|
|
* once.
|
|
*
|
|
* This is an internal OS interface. It is functionally equivalent to
|
|
* sigqueue() except that it does not modify the errno value.
|
|
*
|
|
* Input Parameters:
|
|
* pid - Process ID of task to receive signal
|
|
* signo - Signal number
|
|
* value - Value to pass to task with signal
|
|
*
|
|
* Returned Value:
|
|
* This is an internal OS interface and should not be used by applications.
|
|
* It follows the NuttX internal error return policy: Zero (OK) is
|
|
* returned on success. A negated errno value is returned on failure.
|
|
*
|
|
* EGAIN - The limit of signals which may be queued has been reached.
|
|
* EINVAL - sig was invalid.
|
|
* EPERM - The process does not have permission to send the
|
|
* signal to the receiving process.
|
|
* ESRCH - No process has a PID matching pid.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
int nxsig_queue (int pid, int signo, union sigval value)
|
|
#else
|
|
int nxsig_queue(int pid, int signo, void *sival_ptr)
|
|
#endif
|
|
{
|
|
#ifdef CONFIG_SCHED_HAVE_PARENT
|
|
FAR struct tcb_s *rtcb = this_task();
|
|
#endif
|
|
siginfo_t info;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
sinfo("pid=0x%08x signo=%d value=%d\n", pid, signo, value.sival_int);
|
|
#else
|
|
sinfo("pid=0x%08x signo=%d value=%p\n", pid, signo, sival_ptr);
|
|
#endif
|
|
|
|
/* Sanity checks */
|
|
|
|
if (!GOOD_SIGNO(signo))
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Create the siginfo structure */
|
|
|
|
info.si_signo = signo;
|
|
info.si_code = SI_QUEUE;
|
|
info.si_errno = OK;
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
info.si_value = value;
|
|
#else
|
|
info.si_value.sival_ptr = sival_ptr;
|
|
#endif
|
|
#ifdef CONFIG_SCHED_HAVE_PARENT
|
|
info.si_pid = rtcb->pid;
|
|
info.si_status = OK;
|
|
#endif
|
|
|
|
/* Send the signal */
|
|
|
|
sched_lock();
|
|
ret = nxsig_dispatch(pid, &info);
|
|
sched_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sigqueue
|
|
*
|
|
* Description:
|
|
* This function sends the signal specified by signo with the signal
|
|
* parameter value to the process specified by pid.
|
|
*
|
|
* If the receiving process has the signal blocked via the sigprocmask,
|
|
* the signal will pend until it is unmasked. Only one pending signal (per
|
|
* signo) is retained. This is consistent with POSIX which states, "If
|
|
* a subsequent occurrence of a pending signal is generated, it is
|
|
* implementation defined as to whether the signal is delivered more than
|
|
* once."
|
|
*
|
|
* Input Parameters:
|
|
* pid - Process ID of task to receive signal
|
|
* signo - Signal number
|
|
* value - Value to pass to task with signal
|
|
*
|
|
* Returned Value:
|
|
* On success (at least one signal was sent), zero (OK) is returned. On
|
|
* any failure, -1 (ERROR) is returned and errno varaible is set
|
|
* appropriately:
|
|
*
|
|
* EGAIN - The limit of signals which may be queued has been reached.
|
|
* EINVAL - sig was invalid.
|
|
* EPERM - The process does not have permission to send the
|
|
* signal to the receiving process.
|
|
* ESRCH - No process has a PID matching pid.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
int sigqueue (int pid, int signo, union sigval value)
|
|
#else
|
|
int sigqueue(int pid, int signo, void *sival_ptr)
|
|
#endif
|
|
{
|
|
int ret;
|
|
|
|
/* Let nxsig_queue() do all of the real work */
|
|
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
ret = nxsig_queue(pid, signo, value);
|
|
#else
|
|
ret = nxsig_queue(pid, signo, sival_ptr);
|
|
#endif
|
|
if (ret < 0)
|
|
{
|
|
set_errno(-ret);
|
|
ret = ERROR;
|
|
}
|
|
|
|
return ret;
|
|
}
|