arch/x64/sysroot/include/bits/x86_64/ipc.h

struct ipc_perm {
    key_t __ipc_perm_key;
    uid_t uid;
    gid_t gid;
    uid_t cuid;
    gid_t cgid;
    mode_t mode;
    int __ipc_perm_seq;
    long __pad1;
    long __pad2;
};

#define IPC_64 0