mypipe.c

os project / shell 程序

#include <stdio.h>

int main(int argc, char **argv){
	 FILE *pipein_fp, *pipeout_fp;
        char readbuf[80];
        /*create one way pipe line with call to popen()*/
        if((pipein_fp = popen(argv[1],"r")) == NULL){
                perror("popen");
                exit(1);
        }
        if((pipeout_fp = popen(argv[3],"w")) == NULL){
                perror("popen");
                exit(1);
        }
                                                                                
        while(fgets(readbuf,80,pipein_fp))
                fputs(readbuf,pipeout_fp);
                                                                                
        pclose(pipein_fp);
        pclose(pipeout_fp);
        return 0;
}