Msgget problems I sentence code ~ ~ Msgget (rcv_msgid, 0) The parameters of how to use the back 0??? A book that msgget (rcv_msgid, IPC_CREAT | 0777), which controls I do not know why the use 0? What does this mean? Msgget problems --> Msgget problems Msgget (rcv_msgid, 0) has been created Queue ID Msgget (rcv_msgid, IPC_CREAT | 0777) is to set up queue Generally, first msgget (rcv_msgid, 0), not to create shows not, then msgget (rcv_msgid, IPC_CREAT | 0777) to create it Msgget problems Guangzhou Trade Fair necessary? Direct msgget (rcv_msgid, IPC_CREAT | 0777), can it not? Msgget problems If the queue has been established (this process or other processes), msgget (rcv_msgid, IPC_CREAT | 0777) to be wrong, not its Queue Msgget problems Sorry! I say msgget (rcv_msgid, IPC_CREAT | 0777) can build on the Queue ID Msgget problems ~ ~ Thank you, oh 哈~~ know the book there is a message queue to judge whether to create ~ ~ If established, another old building to be wrong, here is the original true weighty ~ ~ Oh 呀~~ Let us look at the label of the code should be very good ~~~ If ((_id_request = msgget (rcv_msgid, 0)) "0) If ((_id_request = msgget (rcv_msgid, IPC_CREAT | 0777)) "0)     { Perror ( "msgget rcv_msgid error"); Return (-1);     } If ((_id_response = msgget (snd_msgid, 0)) "0) If ((_id_response = msgget (snd_msgid, IPC_CREAT | 0777)) "0)     { Perror ( "msgget snd_msgid error"); Return (-1); } [ Closed window ]