149 lines
4.7 KiB
C
149 lines
4.7 KiB
C
/****************************************************************************
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* sched/signal/sig_queue.c
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*
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* Copyright (C) 2007-2009, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <nuttx/compiler.h>
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#include <signal.h>
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#include <debug.h>
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#include <sched.h>
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#include <errno.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: sigqueue
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*
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* Description:
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* This function sends the signal specified by signo with the signal
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* parameter value to the process specified by pid.
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*
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* If the receiving process has the signal blocked via the sigprocmask,
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* the signal will pend until it is unmasked. Only one pending signal (per
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* signo) is retained. This is consistent with POSIX which states, "If
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* a subsequent occurrence of a pending signal is generated, it is
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* implementation defined as to whether the signal is delivered more than
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* once."
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*
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* Parameters:
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* pid - Process ID of task to receive signal
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* signo - Signal number
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* value - Value to pass to task with signal
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*
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* Return Value:
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* On success (at least one signal was sent), zero is returned. On
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* error, -1 is returned, and errno is set appropriately:
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*
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* EGAIN The limit of signals which may be queued has been reached.
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* EINVAL sig was invalid.
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* EPERM The process does not have permission to send the
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* signal to the receiving process.
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* ESRCH No process has a PID matching pid.
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*
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* Assumptions:
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*
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****************************************************************************/
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#ifdef CONFIG_CAN_PASS_STRUCTS
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int sigqueue (int pid, int signo, union sigval value)
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#else
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int sigqueue(int pid, int signo, void *sival_ptr)
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#endif
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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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siginfo_t info;
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int ret;
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#ifdef CONFIG_CAN_PASS_STRUCTS
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sinfo("pid=0x%08x signo=%d value=%d\n", pid, signo, value.sival_int);
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#else
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sinfo("pid=0x%08x signo=%d value=%p\n", pid, signo, sival_ptr);
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#endif
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/* Sanity checks */
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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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/* Create the siginfo structure */
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info.si_signo = signo;
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info.si_code = SI_QUEUE;
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info.si_errno = OK;
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#ifdef CONFIG_CAN_PASS_STRUCTS
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info.si_value = value;
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#else
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info.si_value.sival_ptr = sival_ptr;
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#endif
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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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/* Send the signal */
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sched_lock();
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ret = sig_dispatch(pid, &info);
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sched_unlock();
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/* Check for errors */
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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:
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set_errno(-ret);
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return ERROR;
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}
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