/**************************************************************************** * sched/signal/sig_queue.c * * Copyright (C) 2007-2009, 2013, 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #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; }