MSG_LEN
if (msgrcv(id, &msg, MSG_LEN, MSG_MTYPE_1, 0) < 0)
(void)msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT);
MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
MSG_LEN - 1, MSG_MTYPE_1, IPC_NOWAIT) == -1);
(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_2, IPC_NOWAIT);
(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT);
ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
if (msgrcv(id, &msg, MSG_LEN, MSG_MTYPE_1,
(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
char buf[MSG_LEN];
(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT);