minix/kernel/ipc.h

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#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. */
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#define NON_BLOCKING 0x0080 /* do not block if target not ready */
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/* System call numbers that are passed when trapping to the kernel. */
#define SEND 1 /* blocking send */
#define RECEIVE 2 /* blocking receive */
#define SENDREC 3 /* SEND + RECEIVE */
#define NOTIFY 4 /* asynchronous notify */
#define SENDNB 5 /* nonblocking send */
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#define SENDA 16 /* asynchronous send */
#define WILLRECEIVE(target, source_ep) \
((RTS_ISSET(target, RECEIVING) && !RTS_ISSET(target, SENDING)) && \
(target->p_getfrom_e == ANY || target->p_getfrom_e == source_ep))
#endif /* IPC_H */