/************************************************************
* sig_queue.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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 <sys/types.h>
#include <signal.h>
#include <debug.h>
#include <sched.h>
#include "os_internal.h"
#include "sig_internal.h"
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Type Declarations
************************************************************/
/************************************************************
* Global Variables
************************************************************/
/************************************************************
* Private Variables
************************************************************/
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Public Functions
************************************************************/
/************************************************************
* Function: 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."
*
* Parameters:
* pid - Process ID of task to receive signal
* signo - Signal number
* value - Value to pass to task with signal
*
* Return Value:
* None
*
* Assumptions:
*
************************************************************/
int sigqueue (int pid, int signo, const union sigval value)
{
_TCB *stcb;
siginfo_t info;
int ret = ERROR;
sched_lock();
/* Get the TCB of the receiving task */
stcb = sched_gettcb(pid);
dbg("sigqueue: TCB=0x%08x signo=%d value=%d\n",
stcb, signo, value.sival_int);
/* Create the siginfo structure */
info.si_signo = signo;
info.si_code = SI_QUEUE;
info.si_value = value;
/* Verify that we can perform the signalling operation */
if (stcb && GOOD_SIGNO(signo))
{
/* Process the receipt of the signal */
ret = sig_received(stcb, &info);
}
sched_unlock();
return ret;
}
