IPC_NOWAIT
if ((msgflg & IPC_NOWAIT) != 0) {
if ((msgflg & IPC_NOWAIT) != 0) {
(sopptr->sem_flg & IPC_NOWAIT) ?
if (sopptr->sem_flg & IPC_NOWAIT) {
ATF_REQUIRE_EQ(0, msgsnd(msqid, &msg, BUFFSIZE, IPC_NOWAIT));
ATF_REQUIRE_EQ(-1, msgsnd(-1, NULL, 0, IPC_NOWAIT));
ATF_REQUIRE_EQ(0, msgsnd(msqid, &msg1, BUFFSIZE, IPC_NOWAIT));
BUFFSIZE, 0, MSG_NOERROR | IPC_NOWAIT)) != -1);
ATF_REQUIRE_EQ(-1, msgrcv(-1, NULL, 0, 0, MSG_NOERROR | IPC_NOWAIT));