#define _GNU_SOURCE
#include <stdio.h>
#include <assert.h>
#include <signal.h>

/*------------------------------------------------------------------*/

static void myHandler(int iSig)

/* This function is intended to be a handler for signals of various
   types.  Print iSig to stdout. */

{
   printf("In myHandler with argument %d\n", iSig);
}

/*------------------------------------------------------------------*/

int main(void)

/* Illustrate the signal() function.

   Note that this program can be exited only by sending it a SIGKILL
   signal from another terminal. */

{
   void (*pfRet)(int);

   pfRet = signal(SIGHUP, myHandler);  /* 1 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGINT, myHandler);  /* 2 Generated by ^c */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGQUIT, myHandler); /* 3 Generated by ^\ */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGILL, myHandler);  /* 4 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGTRAP, myHandler); /* 5 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGABRT, myHandler); /* 6 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGBUS, myHandler);  /* 7 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGFPE, myHandler);  /* 8 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGKILL, myHandler); /* 9 Should fail */
   assert(pfRet == SIG_ERR);

   pfRet = signal(SIGUSR1, myHandler); /* 10 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGSEGV, myHandler); /* 11 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGUSR2, myHandler); /* 12 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGPIPE, myHandler); /* 13 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGALRM, myHandler); /* 14 Generated by alarms */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGTERM, myHandler); /* 15 Default from kill cmd */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGCHLD, myHandler); /* 17 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGCONT, myHandler); /* 18 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGSTOP, myHandler); /* 19 Should fail */
   assert(pfRet == SIG_ERR);

   pfRet = signal(SIGTSTP, myHandler); /* 20 Generated by ^z */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGTTIN, myHandler); /* 21 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGTTOU, myHandler); /* 22 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGURG, myHandler);  /* 23 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGXCPU, myHandler); /* 24 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGXFSZ, myHandler); /* 25 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGVTALRM, myHandler);/* 26 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGPROF, myHandler); /* 27 For profilers */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGWINCH, myHandler);/* 28 */
   assert(pfRet != SIG_ERR);

   pfRet = signal(SIGIO, myHandler);   /* 29 */
   assert(pfRet != SIG_ERR);

   // pfRet = signal(SIGPWR, myHandler);  /* 30 */
   // assert(pfRet != SIG_ERR);

   pfRet = signal(SIGSYS, myHandler);  /* 31 */
   assert(pfRet != SIG_ERR);

  //  pfRet = signal(SIGRTMIN, myHandler);/* 32 */
  //  assert(pfRet != SIG_ERR);

  // pfRet = signal(SIGRTMIN, myHandler);/* 33 */
  // assert(pfRet != SIG_ERR);

   printf("Entering an infinite loop\n");
   for (;;)
      ;

   return 0;
}