_fork.h

Unix shell是unix的命令解释程序

#include<sys/types.h>
#include<sys/wait.h>
#include<unistd.h>

void _fork(char *str1,char *str2,char *str3)
{
	char *str4[]={str2,str3};
	int pid;
	pid=fork();
	if(pid==0)
	{

		if(execvp(str1,str4)==-1) 
			printf("%s\n","Command Not found");
		else 
			printf("%s\n"," execute");
		exit(0);
	}
	else if ((pid=waitpid(pid,NULL,0))<0)
		printf("%s\n","waitpid error");
}