source: branches/minix3-book/include/minix/ipc.h

#ifndef _IPC_H
#define _IPC_H

/*==========================================================================* 
 * Types relating to messages.                                              *
 *==========================================================================*/ 

#define M1                 1
#define M3                 3
#define M4                 4
#define M3_STRING         14

typedef struct {int m1i1, m1i2, m1i3; char *m1p1, *m1p2, *m1p3;} mess_1;
typedef struct {int m2i1, m2i2, m2i3; long m2l1, m2l2; char *m2p1;} mess_2;
typedef struct {int m3i1, m3i2; char *m3p1; char m3ca1[M3_STRING];} mess_3;
typedef struct {long m4l1, m4l2, m4l3, m4l4, m4l5;} mess_4;
typedef struct {short m5c1, m5c2; int m5i1, m5i2; long m5l1, m5l2, m5l3;}mess_5;
typedef struct {int m7i1, m7i2, m7i3, m7i4; char *m7p1, *m7p2;} mess_7;
typedef struct {int m8i1, m8i2; char *m8p1, *m8p2, *m8p3, *m8p4;} mess_8;

typedef struct {
  int m_source;                 /* who sent the message */
  int m_type;                   /* what kind of message is it */
  union {
        mess_1 m_m1;
        mess_2 m_m2;
        mess_3 m_m3;
        mess_4 m_m4;
        mess_5 m_m5;
        mess_7 m_m7;
        mess_8 m_m8;
  } m_u;
} message;

/* The following defines provide names for useful members. */
#define m1_i1  m_u.m_m1.m1i1
#define m1_i2  m_u.m_m1.m1i2
#define m1_i3  m_u.m_m1.m1i3
#define m1_p1  m_u.m_m1.m1p1
#define m1_p2  m_u.m_m1.m1p2
#define m1_p3  m_u.m_m1.m1p3

#define m2_i1  m_u.m_m2.m2i1
#define m2_i2  m_u.m_m2.m2i2
#define m2_i3  m_u.m_m2.m2i3
#define m2_l1  m_u.m_m2.m2l1
#define m2_l2  m_u.m_m2.m2l2
#define m2_p1  m_u.m_m2.m2p1

#define m3_i1  m_u.m_m3.m3i1
#define m3_i2  m_u.m_m3.m3i2
#define m3_p1  m_u.m_m3.m3p1
#define m3_ca1 m_u.m_m3.m3ca1

#define m4_l1  m_u.m_m4.m4l1
#define m4_l2  m_u.m_m4.m4l2
#define m4_l3  m_u.m_m4.m4l3
#define m4_l4  m_u.m_m4.m4l4
#define m4_l5  m_u.m_m4.m4l5

#define m5_c1  m_u.m_m5.m5c1
#define m5_c2  m_u.m_m5.m5c2
#define m5_i1  m_u.m_m5.m5i1
#define m5_i2  m_u.m_m5.m5i2
#define m5_l1  m_u.m_m5.m5l1
#define m5_l2  m_u.m_m5.m5l2
#define m5_l3  m_u.m_m5.m5l3

#define m7_i1  m_u.m_m7.m7i1
#define m7_i2  m_u.m_m7.m7i2
#define m7_i3  m_u.m_m7.m7i3
#define m7_i4  m_u.m_m7.m7i4
#define m7_p1  m_u.m_m7.m7p1
#define m7_p2  m_u.m_m7.m7p2

#define m8_i1  m_u.m_m8.m8i1
#define m8_i2  m_u.m_m8.m8i2
#define m8_p1  m_u.m_m8.m8p1
#define m8_p2  m_u.m_m8.m8p2
#define m8_p3  m_u.m_m8.m8p3
#define m8_p4  m_u.m_m8.m8p4

/*==========================================================================* 
 * Minix run-time system (IPC).                                             *
 *==========================================================================*/ 

/* Hide names to avoid name space pollution. */
#define echo            _echo
#define notify          _notify
#define sendrec         _sendrec
#define receive         _receive
#define send            _send
#define nb_receive      _nb_receive
#define nb_send         _nb_send

_PROTOTYPE( int echo, (message *m_ptr)                                  );
_PROTOTYPE( int notify, (int dest)                                      );
_PROTOTYPE( int sendrec, (int src_dest, message *m_ptr)                 );
_PROTOTYPE( int receive, (int src, message *m_ptr)                      );
_PROTOTYPE( int send, (int dest, message *m_ptr)                        );
_PROTOTYPE( int nb_receive, (int src, message *m_ptr)                   );
_PROTOTYPE( int nb_send, (int dest, message *m_ptr)                     );

#endif /* _IPC_H */