cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/ipc.h

#ifndef _UAPI_LINUX_IPC_H

#define _UAPI_LINUX_IPC_H

#include <linux/types.h>


#define IPC_PRIVATE ((__kernel_key_t) 0)  

/* Obsolete, used only for backwards compatibility and libc5 compiles */

struct ipc_perm
{
	
__kernel_key_t	key;
	
__kernel_uid_t	uid;
	
__kernel_gid_t	gid;
	
__kernel_uid_t	cuid;
	
__kernel_gid_t	cgid;
	
__kernel_mode_t	mode; 
	
unsigned short	seq;
};

/* Include the definition of ipc64_perm */
#include <asm/ipcbuf.h>

/* resource get request flags */

#define IPC_CREAT  00001000   
/* create if key is nonexistent */

#define IPC_EXCL   00002000   
/* fail if key exists */

#define IPC_NOWAIT 00004000   
/* return error on wait */

/* these fields are used by the DIPC package so the kernel as standard
   should avoid using them if possible */
   

#define IPC_DIPC 00010000  
/* make it distributed */

#define IPC_OWN  00020000  
/* this machine is the DIPC owner */

/* 
 * Control commands used with semctl, msgctl and shmctl 
 * see also specific commands in sem.h, msg.h and shm.h
 */

#define IPC_RMID 0     
/* remove resource */

#define IPC_SET  1     
/* set ipc_perm options */

#define IPC_STAT 2     
/* get ipc_perm options */

#define IPC_INFO 3     
/* see ipcs */

/*
 * Version flags for semctl, msgctl, and shmctl commands
 * These are passed as bitflags or-ed with the actual command
 */

#define IPC_OLD 0	
/* Old version (no 32-bit UID support on many
                           architectures) */

#define IPC_64  0x0100  
/* New version (support 32-bit UIDs, bigger
                           message sizes, etc. */

/*
 * These are used to wrap system calls.
 *
 * See architecture code for ugly details..
 */

struct ipc_kludge {
	
struct msgbuf __user *msgp;
	
long msgtyp;
};


#define SEMOP		 1

#define SEMGET		 2

#define SEMCTL		 3

#define SEMTIMEDOP	 4

#define MSGSND		11

#define MSGRCV		12

#define MSGGET		13

#define MSGCTL		14

#define SHMAT		21

#define SHMDT		22

#define SHMGET		23

#define SHMCTL		24

/* Used by the DIPC package, try and avoid reusing it */

#define DIPC            25


#define IPCCALL(version,op)	((version)<<16 | (op))


#endif /* _UAPI_LINUX_IPC_H */

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