pipe.c

一个实现基本功能的shell命令解释器

#include "myfun.h"
int my_pipe(char *buff, char *path_rec[])
{
	pid_t pid;
	int i, fp[2], wt, num;
	char temp[MAX/8] = "\0", temp_f[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;
		}
	}
	if(bin_founded(temp, path_rec, argv[i+1]) == -1)
		printf("cmd not found in fun pipe.c\n");
	if(bin_founded(temp_f, path_rec, argv[0]) == -1)
		printf("cmd not found in fun pipe.c\n");
	pipe(fp);
	pid = fork();//just a test func! 
	if(pid == 0)
	{
		close(fp[0]);
		dup2(fp[1], 1);
		execv(temp_f, argv);
		printf("error execv in pipe.c\n");
		exit(1);
	}
	else if(pid > 0)
	{
		wait(&wt);
		close(fp[1]);
		pid = fork();
		if(pid == 0)
		{
			dup2(fp[0], 0);
			execl(temp, argv[i+1], NULL);
			printf("error\n");
			exit(0);
		}
		else if(pid > 0)
		{
			wait(&wt);
		}
	}
	return 0;
}