ysh.h

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#define HISNUM 11
#define BUFSIZE 200
typedef struct ENV_HISTROY{
	int start;
	int end;
	char his_cmd[HISNUM][100];
} ENV_HISTORY;

typedef struct NODE{
	pid_t pid;
	char cmd[100];
	char state[10];
	struct NODE *link;
} NODE;

void init_environ();
char *envpath[10],buf[BUFSIZE],*input=NULL;
pid_t pid1=0;
int sig_flag=0,sig_z=0;
ENV_HISTORY envhis;
NODE *head,*end;