/* ------------------------ sign.c ------------------------ */

#define SIGN_H

# include <stdio.h>
# include "sign.h"

void shell_handler(int sig){
  if( (sig == SIGCHLD) || (sig == SIGCLD)) {
     int status;
     waitpid(0, &status, WNOHANG);
     lastExitStat = (status >> 8) & 255;
  } 
  return;
}

struct sigaction newact, oldact;

Sigfunc ignoresig(int sig) {
   static int first = 1;
   newact.sa_handler = shell_handler;
   if (first) {
      first = 0;
      if (sigemptyset(&newact.sa_mask) < 0)
          return SIG_ERR;
      newact.sa_flags = 0;
      newact.sa_flags |= SA_RESTART;
      if (sigaction(sig, &newact, &oldact) < 0)
              return SIG_ERR;
      else
              return oldact.sa_handler;
   } else {
      if (sigaction(sig, &newact, NULL) < 0)
              return SIG_ERR;
      else
              return NULL;
   }
}


struct sigaction newact_bg, oldact_bg;

Sigfunc ignoresig_bg(int sig) {
   newact_bg.sa_handler = SIG_IGN;
   if (sigemptyset(&newact_bg.sa_mask) < 0)
          return SIG_ERR;
   newact_bg.sa_flags = 0;
   newact_bg.sa_flags |= SA_RESTART;
   if (sigaction(sig, &newact_bg, &oldact_bg) < 0)
              return SIG_ERR;
   else
              return oldact_bg.sa_handler;
}



Sigfunc entrysig(int sig)   {
   if (sigaction(sig, &oldact, NULL) < 0 )
      return SIG_ERR;
   else
      return NULL;
}