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#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <fcntl.h>
#define F(cmd) ( (r=cmd),r<0?(perror(#cmd),exit(1),r):r )
int main() {
int r;
int pA[2];
int f = F(open("mehlog", O_CREAT | O_APPEND | O_WRONLY, 0644));
pipe(pA);
//pipe(pB);
if (!F(fork())) {
close(f);
dup2(pA[1], STDOUT_FILENO);
close(pA[0]);
close(pA[1]);
F(execlp("cat", "cat", NULL));
}
close(pA[1]);
if (!F(fork())) {
dup2(f, STDOUT_FILENO);
dup2(pA[0], STDIN_FILENO);
close(pA[0]);
close(f);
F(execlp("rev", "rev", NULL));
}
close(pA[0]);
close(f);
wait(NULL);
return 0;
}
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