Using pipe to have one command read from another , command1 | command2

[dblack305]

Im having difficulty writing this program, basically im trying to use a Pipe to read from one command and write to another. For this example i have been trying ls | sort -r . Its executing the ls command but not writing it into the sort -r command. Below is is what i have so far, Can anyone assist, Thanks.


CPipe(char* command1[], char* command2[])

{

pid_t pid;
int fd[2];

/* get a pipe
if (pipe(fd) == -1)
{
error("cissh: error creating pipe");
exit(1);


pid = fork();

if (pid < 0) {
error("cissh: error creating fork");
exit(1);
}



if ( pid > 0 ) {

close(fd[1]);

if(dup(fd[0]) < 0)
{
error("cissh: error duplicating standard input ");
perror("dup()");
exit(1);

}

close(fd[0]);
execvp(command2[0],command2);

}



close(fd[0]);

if(dup(fd[1]) < 0)
{
error("cissh: error duplicating standard output ");
perror("dup()");
exit(1);
}

close(fd[1]);
execvp(command1[0],command1);
}