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#include <fcntl.h> #include <errno.h> #include <stdio.h> #include <unistd.h> int main() { int fd[2], err; pipe(fd); err = fcntl(fd[0], F_SETOWN, getpid()); if (err == -1) printf("fcntl failed: %d\n", errno); return 0; } /* Output: fcntl failed: 25 */

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