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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(int argc, char* argv[]) {
int pf[2];
pipe(pf);
int f = fork();
if (f == 0) { // child
if (close(pf[0]) < 0) {
perror("close");
return 1;
}
dup2(pf[1], 1);
if (close(pf[1]) < 0) {
perror("close");
return 2;
}
execlp(argv[1], argv[1], (char*)NULL);
}
else {
if (close(pf[1]) < 0) {
perror("close");
return 3;
}
dup2(pf[0], 0);
if (close(pf[0]) < 0) {
perror("close");
return 4;
}
int status;
wait(&status);
execlp(argv[2], argv[2], (char*)NULL);
}
return 0;
}
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