#ifndef _SYS_IPC_H #define _SYS_IPC_H 1 // https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_ipc.h.html #include <sys/cdefs.h> __BEGIN_DECLS #define __need_uid_t #define __need_gid_t #define __need_mode_t #define __need_key_t #include <sys/types.h> struct ipc_perm { uid_t uid; /* Owner's user ID. */ gid_t gid; /* Owner's group ID. */ uid_t cuid; /* Creator's user ID. */ gid_t cgid; /* Creator's group ID. */ mode_t mode; /* Read/write permission. */ }; #define IPC_CREAT 0x01 #define IPC_EXCL 0x02 #define IPC_NOWAIT 0x04 #define IPC_PRIVATE 0x08 #define IPC_RMID 0x10 #define IPC_SET 0x20 #define IPC_STAT 0x40 key_t ftok(const char* path, int id); __END_DECLS #endif