// Remove deletes the queue.
// This will also awake all waiting readers and writers with EIDRM.
func (mq MessageQueue) Remove() error {
rc, err := C.msgctl(C.int(mq), C.IPC_RMID, nil)
if rc == -1 {
return err
}
return nil
}
// Stat produces information about the queue.
func (mq MessageQueue) Stat() (*MQInfo, error) {
mqds := C.struct_msqid_ds{}
rc, err := C.msgctl(C.int(mq), C.IPC_STAT, &mqds)
if rc == -1 {
return nil, err
}
mqinf := MQInfo{
Perms: IpcPerms{
OwnerUID: int(mqds.msg_perm.uid),
OwnerGID: int(mqds.msg_perm.gid),
CreatorUID: int(mqds.msg_perm.cuid),
CreatorGID: int(mqds.msg_perm.cgid),
Mode: uint16(mqds.msg_perm.mode),
},
LastSend: time.Unix(int64(mqds.msg_stime), 0),
LastRcv: time.Unix(int64(mqds.msg_rtime), 0),
LastChange: time.Unix(int64(mqds.msg_ctime), 0),
MsgCount: uint(mqds.msg_qnum),
MaxBytes: uint(mqds.msg_qbytes),
LastSender: int(mqds.msg_lspid),
LastRcver: int(mqds.msg_lrpid),
}
return &mqinf, nil
}
// Set updates parameters of the queue.
func (mq MessageQueue) Set(mqi *MQInfo) error {
mqds := &C.struct_msqid_ds{
msg_perm: C.struct_ipc_perm{
uid: C.__uid_t(mqi.Perms.OwnerUID),
gid: C.__gid_t(mqi.Perms.OwnerGID),
mode: C.ushort(mqi.Perms.Mode & 0x1FF),
},
msg_qbytes: C.msglen_t(mqi.MaxBytes),
}
rc, err := C.msgctl(C.int(mq), C.IPC_SET, mqds)
if rc == -1 {
return err
}
return nil
}
// msgctl(2)
// int msgctl(int msqid, int cmd, struct msqid_ds *buf);
func msgctl(key int, cmd int) (*C.struct_msqid_ds, error) {
info := new(C.struct_msqid_ds)
_, err := C.msgctl(C.int(key), C.int(cmd), info)
return info, err
}