pipe.c

scounix编译通过,c/s完整实现

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

main(void) 
{
	int	f_des[2] ;
	if (pipe(f_des) == -1 )
	{
		perror("pipe");
		exit(1) ;
	}
	
	switch ( fork() )
	{
		case -1 :
			perror("fork") ;
			exit(2) ;
		case 0:
			dup2(f_des[1] , fileno(stdout));
			close(f_des[0]) ;
			close(f_des[1]) ;
			execl("/usr/bin/last", "last", (char*)0);
			exit(3) ;
		default:
			dup2(f_des[0] , fileno(stdin));
			close(f_des[0]) ;
			close(f_des[1]) ;
			execl("/bin/sort", "sort", (char*)0);
			exit(4) ;
	}
}