kernel/ipc.h

   1 #ifndef IPC_H
   2 #define IPC_H
   3
   4 /* This header file defines constants for MINIX inter-process communication.
   5  * These definitions are used in the file proc.c.
   6  */
   7 #include <minix/com.h>
   8
   9 /* Masks and flags for system calls. */
  10 #define NON_BLOCKING    0x0080  /* do not block if target not ready */
  11 #define FROM_KERNEL     0x0100  /* message from kernel on behalf of a process */
  12
  13 #define WILLRECEIVE(target, source_ep) \
  14   ((RTS_ISSET(target, RTS_RECEIVING) && !RTS_ISSET(target, RTS_SENDING)) &&     \
  15     (target->p_getfrom_e == ANY || target->p_getfrom_e == source_ep))
  16
  17 /* IPC status code macros. */
  18 #define IPC_STATUS_REG          bx
  19 #define IPC_STATUS_GET(p)       ((p)->p_reg.IPC_STATUS_REG)
  20 #define IPC_STATUS_SET(p, m)    ((p)->p_reg.IPC_STATUS_REG = m)
  21 #define IPC_STATUS_CLEAR(p)     IPC_STATUS_SET(p, 0)
  22 #define IPC_STATUS_ADD(p, m)    ((p)->p_reg.IPC_STATUS_REG |= m)
  23
  24 #endif /* IPC_H */