main.c

#include "shell.h"
#include <stdbool.h>
#include <signal.h>


static void handler(int sig){
      
      int pid=atoi(getenv("pid_father"));
      pid_t pid_cur=getpid();
      
      if(pid==pid_cur)return;
      if(pid_cur!=pid){
        
        
        kill(pid_cur,SIGSTOP);
        

      }
      

    }
static void sigttin_hand(int sig){
    //printf("%d\n",getpid());
    kill(getpid(),SIGSTOP);
}

static void sigusr_hand(int sig){
       int fdnull =open("/dev/null",O_RDONLY);
       dup2(fdnull,STDIN_FILENO);

}

static void sigint_hand(int sig){
      int pid=atoi(getenv("pid_father"));
      pid_t pid_cur=getpid();
     
      if(pid==pid_cur)return;
      if(pid_cur!=pid){
     
        kill(pid_cur,SIGKILL);
       }
}

 
int main(int argc , char** argv){
  

  struct sigaction back_stdin; 
  back_stdin.sa_handler=sigttin_hand;
  back_stdin.sa_flags=SA_RESTART|SA_NOCLDWAIT|SA_NOCLDSTOP;
  sigaction(SIGTTIN,&back_stdin,NULL);
  sigaction(SIGTTOU,&back_stdin,NULL);
 

 
  if(getenv("pid_father")==NULL){
     int fd=open("pid_list",O_CREAT|O_TRUNC,0644);
     //printf("%d\n",fd);
     close(fd);

  }
  pid_t pid= getpid();
  char s[10];
  sprintf(s,"%d",pid);
  setenv("pid_father",s,0);
  
  struct sigaction background;
  background.sa_handler=sigusr_hand;
  background.sa_flags=SA_RESTART|SA_NOCLDWAIT|SA_NOCLDSTOP;
  sigaction(SIGUSR1,&background,NULL);
  struct sigaction ctrlz;
  ctrlz.sa_handler=handler;
  ctrlz.sa_flags =SA_RESTART|SA_NOCLDWAIT|SA_NOCLDSTOP;
  sigaction(SIGTSTP,&ctrlz,NULL);

   struct sigaction ctrlc;
  ctrlc.sa_handler=sigint_hand;
  ctrlc.sa_flags =SA_RESTART|SA_NOCLDWAIT|SA_NOCLDSTOP;
  sigaction(SIGINT,&ctrlc,NULL);
  
 
  char* line;
  char* dir;
  if((line=(char*)malloc(1024))==NULL)error("malloc failed",EXIT_FAILURE);
	if(( dir=(char*)malloc(124))==NULL)error("malloc failed",EXIT_FAILURE);
  int  nb;
  
  int script;
  if((script=open(argv[1],O_RDONLY))){
        
          exec_bash(script);
        
  }
  
  char*** argv_2;
  while((nb=read(STDIN_FILENO,line,1024))>0){
      if(nb<0){
        perror("read");
        exit(EXIT_FAILURE);
      }  
      printf("\n");
      char* in;
      char *out;
      if((in=(char*)malloc(100))==NULL)error("malloc failed",EXIT_FAILURE);
      if(( out=(char*)malloc(100))==NULL)error("malloc failed",EXIT_FAILURE);
      
      getcwd(dir,124);
      printf(" \x1B[32m%s$:\x1B[0m\n ",dir);
      line[nb-1]=0;
      scan_and_replace('>',&line);
      scan_and_replace('<',&line);
      scan_and_replace('|',&line);
      parse_line_pipes(line,&argv_2,&in,&out);
      redir_cmd(argv_2,in,out);
      free(in); 
      free(out);
      free_argv_2(&argv_2);
     }
  free(dir);
  free(line);
  unsetenv("pid_father");

return EXIT_SUCCESS;
}