sighdl.c

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/*
 Copyright (c) 2021, The Neko Authors
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   * 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.
 
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     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
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 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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#include <signal.h>
#include <stdint.h>
#include <time.h>
#include <sys/time.h>
 
#define SIGHDL_XCPU 0x01
#define SIGHDL_ALRM 0x02
 
#define SIGHDL_USR1 0x01
#define SIGHDL_USR2 0x02
 
volatile uint8_t TIMEOUT = 0;
volatile uint8_t USR = 0;
 
void sighdl(int sig_code) {
  switch (sig_code) {
  case SIGXCPU:
    TIMEOUT |= SIGHDL_XCPU;
    break;
  case SIGALRM:
    TIMEOUT |= SIGHDL_ALRM;
    break;
  case SIGUSR1:
    USR |= SIGHDL_USR1;
    break;
  case SIGUSR2:
    USR |= SIGHDL_USR2;
    break;
  default:
    break;
  }
}
 
int8_t sighdl_timeout() {
  return TIMEOUT;
}
 
int8_t sighdl_usr() {
  return USR;
}
 
 
int sighdl_set_timeout(int *sec) {
  struct itimerval itv;
  struct sigaction sig_param;
 
  TIMEOUT &= ~SIGHDL_ALRM;
  sig_param.sa_handler = sighdl;
  sigemptyset(&sig_param.sa_mask);
  sig_param.sa_flags = SA_RESTART;
  if (sigaction(SIGALRM, &sig_param, 0) < 0)
    return -1;
 
  itv.it_value.tv_sec = (*sec);
  itv.it_value.tv_usec = 0;
  itv.it_interval.tv_sec = 0;
  itv.it_interval.tv_usec = 0;
  return setitimer(ITIMER_REAL, &itv, 0);
}
 
int sighdl_trap_cpulimit() {
  struct sigaction sig_param;
 
  TIMEOUT &= ~SIGHDL_XCPU; 
  sig_param.sa_handler = sighdl;
  sigemptyset(&sig_param.sa_mask);
  sig_param.sa_flags = SA_RESTART;
  return sigaction(SIGXCPU, &sig_param, 0);    
}
 
int sighdl_trap_usr() {
  struct sigaction sig_param;
 
  USR = 0;  
  sig_param.sa_handler = sighdl;
  sigemptyset(&sig_param.sa_mask);
  sig_param.sa_flags = SA_RESTART;
  if (sigaction(SIGUSR1, &sig_param, 0) < 0)
    return -1;  
  return sigaction(SIGUSR2, &sig_param, 0);    
}