30 lines
1.2 KiB
C
30 lines
1.2 KiB
C
#ifndef IPC_H
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#define IPC_H
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/* This header file defines constants for MINIX inter-process communication.
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* These definitions are used in the file proc.c.
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*/
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#include <minix/com.h>
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/* Masks and flags for system calls. */
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#define SYSCALL_FUNC 0x0F /* mask for system call function */
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#define SYSCALL_FLAGS 0xF0 /* mask for system call flags */
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#define NON_BLOCKING 0x10 /* prevent blocking, return error */
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/* System call numbers that are passed when trapping to the kernel. The
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* numbers are carefully defined so that it can easily be seen (based on
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* the bits that are on) which checks should be done in sys_call().
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*/
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#define SEND 1 /* 0 0 0 1 : blocking send */
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#define RECEIVE 2 /* 0 0 1 0 : blocking receive */
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#define SENDREC 3 /* 0 0 1 1 : SEND + RECEIVE */
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#define NOTIFY 4 /* 0 1 0 0 : nonblocking notify */
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#define ECHO 8 /* 1 0 0 0 : echo a message */
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/* The following bit masks determine what checks that should be done. */
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#define CHECK_PTR 0x0B /* 1 0 1 1 : validate message buffer */
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#define CHECK_DST 0x05 /* 0 1 0 1 : validate message destination */
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#define CHECK_SRC 0x02 /* 0 0 1 0 : validate message source */
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#define CHECK_DEADLOCK 0x03 /* 0 0 1 1 : check for deadlock */
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#endif /* IPC_H */
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