redirect.c

一个实现基本功能的shell命令解释器

#include "myfun.h"
int redirect(char *buff)
{
	pid_t pid;
	int i, fd, wt, num;
	char temp[MAX/8] = "\0";
	char *argv[5];
	num = cmd_cut(buff, argv);
	for(i=0; i<num; i++)
	{
		if(strncmp(argv[i], ">", 1) == 0)
		{
			argv[i] = NULL;
			break;
		}
	}
	strcpy(temp, "/bin/");
	strcat(temp, argv[0]);
	pid = fork();//just a test func! 
	if(pid == 0)
	{
		if((fd = open(argv[i+1], O_RDWR | O_CREAT)) < 0)
			printf("error\n");
		close(1);
		dup2(fd, 1);
		close(fd);
		execv(temp, argv);
		exit(1);
	}
	else if(pid > 0)
	{
		wait(&wt);
	}
	return 0;
}