cmd.c

#include "header.h"

// void handler_interrupt_c(int signum)
// {
//     char temp[200];
//     // char ok[100];
//     sprintf(temp,"\033[0;33m Process have been interrpted. Press any key to continue\033[0m\n");
//     write(1,temp,sizeof(temp));
//     // scanf("%s",ok);
//     while(getchar()!='\n');
//     getchar();

// }

void sighandler(int sig_num) 
{ 
    // Reset handler to catch SIGTSTP next time 
    if(sh!=getpid() || cur_pid>0){
        signal(SIGTSTP, sighandler); 
        printf(" executed Ctrl+Z\n"); 
    }
    else 
    {
        signal(SIGTSTP, sighandler); 
        printf("Cannot execute Ctrl+Z\n"); 
    }
    return;
}

void handler(int sig)
{
	pid_t pid;
	int st;
	char *exit=(char *)malloc(1024*(sizeof(char)));
	char *exit_status=(char *)malloc(1024*(sizeof(char)));
	pid=waitpid(-1,&st,WNOHANG);
	sprintf(exit,"\n[%s] with pid [%d] exited \n",back_pro[pid],pid);
	if(WIFEXITED(st))
	{
		int ab=WEXITSTATUS(st);
		if(ab==0)
			sprintf(exit_status, "normally\n");
		else
			sprintf(exit_status, "abnormally\n");
	}
	if(pid>0)
	{
		printf("%s%s",exit,exit_status);
	}
	free(exit);
	return;
}

void callingcmd(char* str,int zip,char* str9)
{
    signal(SIGCHLD, handler);
    char cum[10000];
	ll bg=0;
    ll i=0;
    int st;
    char *inp[10000];
    char *temp2;
    temp2 = strtok(str, " \t");            
    strcpy(cum,"");

    while( temp2 != NULL ) 
    {
        if(strcmp(temp2,"&")==0)bg=1;
        
        if(strcmp(temp2,"&")!=0){
            inp[i]=temp2;
            strcat(cum,temp2);
            strcat(cum," ");
            i++;
        }
        temp2 = strtok(NULL, "  \t");
    }
    inp[i]=NULL;

    if(bg==1)
    {
        pid_t pid=fork();
        
        if (pid < 0) 
        {
            perror("ERROR:");
            exit_fail=1;
            exit(0);
        }
        else if(pid==0)
        {
            setpgid(0, 0);
            if ( execvp(inp[0], inp) <0)
            {
                fprintf(stderr,"command: not found\n" );
                exit_fail=1;
                exit(0);
            }
            return;
        }
        else
        {
            order[job_counter][0]=pid;
            strcpy(back_pro[order[job_counter][0]],cum);
            stat_pro[order[job_counter][0]] = 2;
            order[job_counter][1] = -1;
            job_counter++;

            setpgid(pid, 0);
            tcsetpgrp(STDIN_FILENO, getpgrp());
        }
        
    }
    else
    {
        pid_t pid=fork();
        cur_pid=pid;
        if (pid < 0) 
        {
            perror("ERROR:");
            exit_fail=1;
            exit(0);
        }
        else if(pid==0)
        {
            signal(SIGTSTP,sighandler);
             setpgid(0, 0);

            // signal(SIGTSTP,zhand);

            if ( execvp(inp[0], inp) < 0)
            {
                fprintf(stderr,"command: not found\n");
                cur_pid=0;
                exit_fail=1;
                exit(0);
            }
            return ;
        }
        else
        {
            cur_pid=pid;

            signal(SIGTTIN, SIG_IGN);
            signal(SIGTTOU, SIG_IGN);
            setpgid(pid, 0);
            tcsetpgrp(STDIN_FILENO, pid);

            order[job_counter][0]=pid;
            strcpy(back_pro[order[job_counter][0]],cum);
            stat_pro[order[job_counter][0]] = 1;
            order[job_counter][1] = 1;
            job_counter++;
            waitpid(pid,&st,WUNTRACED);
            
            if(WIFSTOPPED(st))
            {
                stat_pro[pid]=2;
            }

            tcsetpgrp(STDIN_FILENO, getpgrp());

            signal(SIGTTIN, SIG_DFL);
            signal(SIGTTOU, SIG_DFL);
           
        }
    }
    return;
}