minix/kernel/ipc.h
2006-03-10 16:10:05 +00:00

34 lines
1.4 KiB
C

#ifndef IPC_H
#define IPC_H
/* This header file defines constants for MINIX inter-process communication.
* These definitions are used in the file proc.c.
*/
#include <minix/com.h>
/* Masks and flags for system calls. */
#define SYSCALL_FUNC 0x00FF /* mask for system call function */
#define SYSCALL_FLAGS 0xFF00 /* mask for system call flags */
#define NON_BLOCKING 0x0100 /* do not block if target not ready */
/* System call numbers that are passed when trapping to the kernel. The
* numbers are carefully defined so that it can easily be seen (based on
* the bits that are on) which checks should be done in sys_call().
*/
#define SEND 1 /* 0000 0001 : blocking send */
#define RECEIVE 2 /* 0000 0010 : blocking receive */
#define SENDREC 3 /* 0000 0011 : SEND + RECEIVE */
#define NOTIFY 4 /* 0000 0100 : nonblocking notify */
#define ECHO 8 /* 0000 1000 : echo a message */
#define IPC_REQUEST 0x10 /* 0001 0000 : blocking request */
#define IPC_REPLY 0x20 /* 0010 0000 : nonblocking reply */
#define IPC_NOTIFY 0x40 /* 0100 0000 : nonblocking notification */
#define IPC_RECEIVE 0x80 /* 1000 0000 : blocking receive */
/* The following bit masks determine what checks that should be done. */
#define CHECK_PTR 0xBB /* 1011 1011 : validate message buffer */
#define CHECK_DST 0x55 /* 0101 0101 : validate message destination */
#define CHECK_DEADLOCK 0x93 /* 1001 0011 : check for deadlock */
#endif /* IPC_H */