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1.1 ! schwarze 1: #include <stddef.h> ! 2: #include <sys/socket.h> ! 3: ! 4: int ! 5: main(void) ! 6: { ! 7: struct msghdr msg; ! 8: ! 9: msg.msg_control = NULL; ! 10: msg.msg_controllen = 0; ! 11: ! 12: return CMSG_FIRSTHDR(&msg) != NULL; ! 13: }