36 lines
605 B
C
36 lines
605 B
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
|
|
int main(void)
|
|
{
|
|
int fd[2], p;
|
|
char c;
|
|
|
|
p = pipe(fd);
|
|
assert(p != -1);
|
|
|
|
pid_t pr = fork();
|
|
assert(pr != -1);
|
|
|
|
switch (pr)
|
|
{
|
|
case 0:
|
|
close(fd[0]);
|
|
dup2(fd[1], 1);
|
|
execl("/usr/bin/ls", "ls", ".", NULL);
|
|
exit(0);
|
|
|
|
default:
|
|
close(fd[1]);
|
|
dup2(fd[0], 0);
|
|
execl("/usr/bin/wc", "wc", "-l", NULL);
|
|
}
|
|
|
|
close(fd[0]);
|
|
return 0;
|
|
} |