/****************************************************************************
* apps/testing/ostest/sighand.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <semaphore.h>
#include <signal.h>
#include <sched.h>
#include <errno.h>
#include "ostest.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef NULL
# define NULL (void*)0
#endif
#define WAKEUP_SIGNAL 17
#define SIGVALUE_INT 42
/****************************************************************************
* Private Data
****************************************************************************/
static sem_t sem;
static bool sigreceived = false;
static bool threadexited = false;
/****************************************************************************
* Private Functions
****************************************************************************/
#ifdef CONFIG_SCHED_HAVE_PARENT
static void death_of_child(int signo, siginfo_t *info, void *ucontext)
{
/* Use of printf in a signal handler is NOT safe! It can cause deadlocks!
* Also, signals are not queued by NuttX. As a consequence, some
* notifications will get lost (or the info data can be overwrittedn)!
* Because POSIX does not require signals to be queued, I do not think
* that this is a bug (the overwriting is a bug, however).
*/
if (info)
{
printf("death_of_child: PID %d received signal=%d code=%d "
"errno=%d pid=%d status=%d\n",
getpid(), signo, info->si_code, info->si_errno,
info->si_pid, info->si_status);
}
else
{
printf("death_of_child: PID %d received signal=%d (no info?)\n",
getpid(), signo);
}
}
#endif
static void wakeup_action(int signo, siginfo_t *info, void *ucontext)
{
sigset_t oldset;
sigset_t allsigs;
int status;
/* Use of printf in a signal handler is NOT safe! It can cause deadlocks! */
printf("wakeup_action: Received signal %d\n" , signo);
sigreceived = true;
/* Check signo */
if (signo != WAKEUP_SIGNAL)
{
printf("wakeup_action: ERROR expected signo=%d\n" , WAKEUP_SIGNAL);
}
/* Check siginfo */
if (info->si_value.sival_int != SIGVALUE_INT)
{
printf("wakeup_action: ERROR sival_int=%d expected %d\n",
info->si_value.sival_int, SIGVALUE_INT);
}
else
{
printf("wakeup_action: sival_int=%d\n" , info->si_value.sival_int);
}
if (info->si_signo != WAKEUP_SIGNAL)
{
printf("wakeup_action: ERROR expected si_signo=%d, got=%d\n",
WAKEUP_SIGNAL, info->si_signo);
}
printf("wakeup_action: si_code=%d\n" , info->si_code);
/* Check ucontext_t */
printf("wakeup_action: ucontext=%p\n" , ucontext);
/* Check sigprocmask */
sigfillset(&allsigs);
status = sigprocmask(SIG_SETMASK, NULL, &oldset);
if (status != OK)
{
printf("wakeup_action: ERROR sigprocmask failed, status=%d\n",
status);
}
if (oldset != allsigs)
{
printf("wakeup_action: ERROR sigprocmask=%x expected=%x\n",
oldset, allsigs);
}
}
static int waiter_main(int argc, char *argv[])
{
sigset_t set;
struct sigaction act;
struct sigaction oact;
int status;
printf("waiter_main: Waiter started\n");
printf("waiter_main: Unmasking signal %d\n" , WAKEUP_SIGNAL);
sigemptyset(&set);
sigaddset(&set, WAKEUP_SIGNAL);
status = sigprocmask(SIG_UNBLOCK, &set, NULL);
if (status != OK)
{
printf("waiter_main: ERROR sigprocmask failed, status=%d\n",
status);
}
printf("waiter_main: Registering signal handler\n");
act.sa_sigaction = wakeup_action;
act.sa_flags = SA_SIGINFO;
sigfillset(&act.sa_mask);
sigdelset(&act.sa_mask, WAKEUP_SIGNAL);
status = sigaction(WAKEUP_SIGNAL, &act, &oact);
if (status != OK)
{
printf("waiter_main: ERROR sigaction failed, status=%d\n" , status);
}
#ifndef SDCC
printf("waiter_main: oact.sigaction=%p oact.sa_flags=%x oact.sa_mask=%x\n",
oact.sa_sigaction, oact.sa_flags, oact.sa_mask);
#endif
/* Take the semaphore */
printf("waiter_main: Waiting on semaphore\n");
FFLUSH();
status = sem_wait(&sem);
if (status != 0)
{
int error = errno;
if (error == EINTR)
{
printf("waiter_main: sem_wait() successfully interrupted by "
"signal\n");
}
else
{
printf("waiter_main: ERROR sem_wait failed, errno=%d\n" , error);
}
}
else
{
printf("waiter_main: ERROR awakened with no error!\n");
}
/* Detach the signal handler */
act.sa_handler = SIG_DFL;
sigaction(WAKEUP_SIGNAL, &act, &oact);
printf("waiter_main: done\n");
FFLUSH();
threadexited = true;
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
void sighand_test(void)
{
#ifdef CONFIG_SCHED_HAVE_PARENT
struct sigaction act;
struct sigaction oact;
sigset_t set;
#endif
struct sched_param param;
union sigval sigvalue;
pid_t waiterpid;
int status;
printf("sighand_test: Initializing semaphore to 0\n");
sem_init(&sem, 0, 0);
#ifdef CONFIG_SCHED_HAVE_PARENT
printf("sighand_test: Unmasking SIGCHLD\n");
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
status = sigprocmask(SIG_UNBLOCK, &set, NULL);
if (status != OK)
{
printf("sighand_test: ERROR sigprocmask failed, status=%d\n",
status);
}
printf("sighand_test: Registering SIGCHLD handler\n");
act.sa_sigaction = death_of_child;
act.sa_flags = SA_SIGINFO;
sigfillset(&act.sa_mask);
sigdelset(&act.sa_mask, SIGCHLD);
status = sigaction(SIGCHLD, &act, &oact);
if (status != OK)
{
printf("waiter_main: ERROR sigaction failed, status=%d\n" , status);
}
#endif
/* Start waiter thread */
printf("sighand_test: Starting waiter task\n");
status = sched_getparam (0, ¶m);
if (status != OK)
{
printf("sighand_test: ERROR sched_getparam() failed\n");
param.sched_priority = PTHREAD_DEFAULT_PRIORITY;
}
waiterpid = task_create("waiter", param.sched_priority,
STACKSIZE, waiter_main, NULL);
if (waiterpid == ERROR)
{
printf("sighand_test: ERROR failed to start waiter_main\n");
}
else
{
printf("sighand_test: Started waiter_main pid=%d\n", waiterpid);
}
/* Wait a bit */
FFLUSH();
sleep(2);
/* Then signal the waiter thread. */
printf("sighand_test: Signaling pid=%d with signo=%d sigvalue=%d\n",
waiterpid, WAKEUP_SIGNAL, SIGVALUE_INT);
sigvalue.sival_int = SIGVALUE_INT;
status = sigqueue(waiterpid, WAKEUP_SIGNAL, sigvalue);
if (status != OK)
{
printf("sighand_test: ERROR sigqueue failed\n");
task_delete(waiterpid);
}
/* Wait a bit */
FFLUSH();
sleep(2);
/* Then check the result */
if (!threadexited)
{
printf("sighand_test: ERROR waiter task did not exit\n");
}
if (!sigreceived)
{
printf("sighand_test: ERROR signal handler did not run\n");
}
/* Detach the signal handler */
#ifdef CONFIG_SCHED_HAVE_PARENT
act.sa_handler = SIG_DFL;
sigaction(SIGCHLD, &act, &oact);
#endif
printf("sighand_test: done\n");
FFLUSH();
}