267 lines
7.8 KiB
C
267 lines
7.8 KiB
C
/****************************************************************************
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* examples/nxflat/tests/signal/signal.c
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*
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* Copyright (C) 2009, 2012, 2015 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 <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define USEC_PER_MSEC 1000
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#define MSEC_PER_SEC 1000
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#define USEC_PER_SEC (USEC_PER_MSEC * MSEC_PER_SEC)
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#define SHORT_DELAY (USEC_PER_SEC / 3)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static int sigusr1_rcvd = 0;
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static int sigusr2_rcvd = 0;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: siguser_action
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***************************************************************************/
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/* NOTE: it is necessary for functions that are referred to by function pointers
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* pointer to be declared with global scope (at least for ARM). Otherwise,
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* a relocation type that is not supported by ELF is generated by GCC.
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*/
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void siguser_action(int signo, siginfo_t *siginfo, void *arg)
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{
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printf("siguser_action: Received signo=%d siginfo=%p arg=%p\n",
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signo, siginfo, arg);
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if (signo == SIGUSR1)
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{
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printf(" SIGUSR1 received\n");
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sigusr2_rcvd = 1;
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}
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else if (signo == SIGUSR2)
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{
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printf(" SIGUSR2 received\n");
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sigusr1_rcvd = 2;
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}
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else
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{
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printf(" ERROR: Unexpected signal\n");
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}
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if (siginfo)
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{
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printf("siginfo:\n");
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printf(" si_signo = %d\n", siginfo->si_signo);
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printf(" si_code = %d\n", siginfo->si_code);
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printf(" si_errno = %d\n", siginfo->si_errno);
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printf(" si_value = %d\n", siginfo->si_value.sival_int);
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: main
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****************************************************************************/
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int main(int argc, char **argv)
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{
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struct sigaction act;
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struct sigaction oact1;
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struct sigaction oact2;
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pid_t mypid = getpid();
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union sigval sigval;
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int status;
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printf("Setting up signal handlers from pid=%d\n", mypid);
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/* Set up so that siguser_action will respond to SIGUSR1 */
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memset(&act, 0, sizeof(struct sigaction));
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act.sa_sigaction = siguser_action;
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act.sa_flags = SA_SIGINFO;
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(void)sigemptyset(&act.sa_mask);
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status = sigaction(SIGUSR1, &act, &oact1);
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if (status != 0)
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{
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fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
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errno);
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exit(2);
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}
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printf("Old SIGUSR1 sighandler at %p\n", oact1.sa_handler);
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printf("New SIGUSR1 sighandler at %p\n", siguser_action);
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/* Set up so that siguser_action will respond to SIGUSR2 */
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status = sigaction(SIGUSR2, &act, &oact2);
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if (status != 0)
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{
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fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
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errno);
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exit(2);
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}
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printf("Old SIGUSR2 sighandler at %p\n", oact2.sa_handler);
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printf("New SIGUSR2 sighandler at %p\n", siguser_action);
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printf("Raising SIGUSR1 from pid=%d\n", mypid);
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fflush(stdout); usleep(SHORT_DELAY);
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/* Send SIGUSR1 to ourselves via kill() */
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printf("Kill-ing SIGUSR1 from pid=%d\n", mypid);
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status = kill(mypid, SIGUSR1);
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if (status != 0)
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{
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fprintf(stderr, "Failed to kill SIGUSR1, errno=%d\n", errno);
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exit(3);
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}
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usleep(SHORT_DELAY);
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printf("SIGUSR1 raised from pid=%d\n", mypid);
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/* Verify that we received SIGUSR1 */
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if (sigusr1_rcvd == 0)
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{
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fprintf(stderr, "SIGUSR1 not received\n");
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exit(4);
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}
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sigusr1_rcvd = 0;
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/* Send SIGUSR2 to ourselves */
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printf("sigqueue-ing SIGUSR2 from pid=%d\n", mypid);
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fflush(stdout); usleep(SHORT_DELAY);
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/* Send SIGUSR2 to ourselves via sigqueue() */
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sigval.sival_int = 87;
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status = sigqueue(mypid, SIGUSR2, sigval);
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if (status != 0)
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{
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fprintf(stderr, "Failed to queue SIGUSR2, errno=%d\n", errno);
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exit(5);
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}
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usleep(SHORT_DELAY);
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printf("SIGUSR2 queued from pid=%d, sigval=87\n", mypid);
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/* Verify that SIGUSR2 was received */
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if (sigusr2_rcvd == 0)
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{
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fprintf(stderr, "SIGUSR2 not received\n");
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exit(6);
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}
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sigusr2_rcvd = 0;
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/* Remove the siguser_action handler and replace the SIGUSR2
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* handler with sigusr2_sighandler.
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*/
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printf("Resetting SIGUSR2 signal handler from pid=%d\n", mypid);
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status = sigaction(SIGUSR2, &oact2, &act);
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if (status != 0)
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{
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fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
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errno);
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exit(2);
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}
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printf("Old SIGUSR1 sighandler at %p\n", act.sa_handler);
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printf("New SIGUSR1 sighandler at %p\n", oact1.sa_handler);
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/* Verify that the handler that was removed was siguser_action */
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if ((void*)act.sa_handler != (void*)siguser_action)
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{
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fprintf(stderr,
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"Old SIGUSR2 signal handler (%p) is not siguser_action (%p)\n",
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act.sa_handler, siguser_action);
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exit(8);
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}
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/* Send SIGUSR2 to ourselves via kill() */
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printf("Killing SIGUSR2 from pid=%d\n", mypid);
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fflush(stdout); usleep(SHORT_DELAY);
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status = kill(mypid, SIGUSR2);
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if (status != 0)
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{
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fprintf(stderr, "Failed to kill SIGUSR2, errno=%d\n", errno);
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exit(9);
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}
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usleep(SHORT_DELAY);
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printf("SIGUSR2 killed from pid=%d\n", mypid);
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/* Verify that SIGUSR2 was received */
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if (sigusr2_rcvd == 0)
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{
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fprintf(stderr, "SIGUSR2 not received\n");
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exit(10);
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}
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sigusr2_rcvd = 0;
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return 0;
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}
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