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/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Fulup Ar Foll"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed 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.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/syscall.h>
#include <setjmp.h>
#include "afb-sig-handler.h"
#include "verbose.h"
static _Thread_local sigjmp_buf *error_handler;
static void on_signal_terminate (int signum)
{
ERROR("Terminating signal received %s", strsignal(signum));
exit(1);
}
static void on_signal_error(int signum)
{
sigset_t sigset;
// unlock signal to allow a new signal to come
if (error_handler != NULL) {
sigemptyset(&sigset);
sigaddset(&sigset, signum);
sigprocmask(SIG_UNBLOCK, &sigset, 0);
longjmp(*error_handler, signum);
}
if (signum == SIGALRM)
return;
ERROR("Unmonitored signal received %s", strsignal(signum));
exit(2);
}
static int install(void (*handler)(int), int *signals)
{
int result = 1;
while(*signals > 0) {
if (signal(*signals, handler) == SIG_ERR) {
ERROR("failed to install signal handler for signal %s", strsignal(*signals));
result = 0;
}
signals++;
}
return result;
}
int afb_sig_handler_init()
{
static int sigerr[] = { SIGALRM, SIGSEGV, SIGFPE, 0 };
static int sigterm[] = { SIGINT, SIGABRT, 0 };
return (install(on_signal_error, sigerr) & install(on_signal_terminate, sigterm)) - 1;
}
void afb_sig_monitor(void (*function)(int sig, void*), void *closure, int timeout)
{
volatile int signum, timerset;
timer_t timerid;
sigjmp_buf jmpbuf, *older;
struct sigevent sevp;
struct itimerspec its;
timerset = 0;
older = error_handler;
signum = setjmp(jmpbuf);
if (signum != 0) {
function(signum, closure);
}
else {
error_handler = &jmpbuf;
if (timeout > 0) {
timerset = 1; /* TODO: check statuses */
sevp.sigev_notify = SIGEV_THREAD_ID;
sevp.sigev_signo = SIGALRM;
sevp.sigev_value.sival_ptr = NULL;
#if defined(sigev_notify_thread_id)
sevp.sigev_notify_thread_id = (pid_t)syscall(SYS_gettid);
#else
sevp._sigev_un._tid = (pid_t)syscall(SYS_gettid);
#endif
timer_create(CLOCK_THREAD_CPUTIME_ID, &sevp, &timerid);
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0;
its.it_value.tv_sec = timeout;
its.it_value.tv_nsec = 0;
timer_settime(timerid, 0, &its, NULL);
}
function(0, closure);
}
if (timerset)
timer_delete(timerid);
error_handler = older;
}
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