csignal

//==============================================================================
//
//  csignal
//
#ifndef CSIGNAL_INCLUDED
#define CSIGNAL_INCLUDED

#include "cstddef"

#define SIGABRT 6
#define SIGINT 2
#define SIGILL 4
#define SIGFPE 8
#define SIGSEGV 11
#define SIGTERM 15

#ifdef OS_LINUX
#define SIGBUS 7
#endif

#ifdef OS_WIN
#define SIGBREAK 21
#endif

typedef void (*sighandler)(int sig);
void* signal(int sig, sighandler handler);
int raise(int sig);

#ifdef OS_LINUX

enum
{
   SEGV_MAPERR = 1,
   SEGV_ACCERR,
   SEGV_BNDERR,
   SEGV_PKUERR,
   SEGV_ACCADI,
   SEGV_ADIDERR,
   SEGV_ADIPERR
};

struct siginfo_t
{
   int si_signo;  // signal number
   int si_errno;  // from errno.h
   int si_code;   // specifies field(s) with further info

   //  Fields for SIGILL, SIGFPE, SIGSEGV, and SIGBUS.
   //
   void* si_addr;
   short si_addr_lsb;
   void* si_lower;    // si_code is SEGV_BNDERR
   void* si_upper;    // si_code is SEGV_BNDERR
   uint32_t si_pkey;  // si_code is SEGV_PKUERR
};

typedef void (*sigacthandler)(int signo, siginfo_t* info, void* unused);

constexpr int SIGSET_NWORDS = (1024 / (8 * sizeof (unsigned long)));

struct sigset_t
{
   unsigned long int val[SIGSET_NWORDS];
};

int sigemptyset(sigset_t* set);

constexpr int SA_SIGINFO = 4;
constexpr int SA_NODEFER = 0x40000000;
constexpr int SA_RESETHAND = 0x80000000;

struct sigaction
{
   union
   {
      sighandler sa_handler;       // used if SA_SIGINFO not set
      sigacthandler sa_sigaction;  // used if SA_SIGINFO set
   };

   sigset_t sa_mask;
   int sa_flags;
};

int sigaction(int signo, const struct sigaction* act, struct sigaction* oact);

#endif
#endif