ipc.h 203 字节
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struct ipc_perm {
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	key_t __ipc_perm_key;
	uid_t uid;
	gid_t gid;
	uid_t cuid;
	gid_t cgid;
	mode_t mode;
	int __ipc_perm_seq;
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	int __pad1;
	long long __pad2;
	long long __pad3;
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};
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#define IPC_64 0x100