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 SYSCALL_FUNC    0x000F  /* mask for system call function */
  11 #define SYSCALL_FLAGS   0x00F0  /* mask for system call flags */
  12 #define NON_BLOCKING    0x0010  /* do not block if target not ready */
  13
  14 /* System call numbers that are passed when trapping to the kernel. The
  15  * numbers are carefully defined so that it can easily be seen (based on
  16  * the bits that are on) which checks should be done in sys_call().
  17  */
  18 #define SEND               1    /* 0001 : blocking send */
  19 #define RECEIVE            2    /* 0010 : blocking receive */
  20 #define SENDREC            3    /* 0011 : SEND + RECEIVE */
  21 #define NOTIFY             4    /* 0100 : nonblocking notify */
  22 #define ECHO               8    /* 1000 : echo a message */
  23
  24 #define IPC_REQUEST        5    /* 0101 : blocking request */
  25 #define IPC_REPLY          6    /* 0110 : nonblocking reply */
  26 #define IPC_NOTIFY         7    /* 0111 : nonblocking notification */
  27 #define IPC_RECEIVE        9    /* 1001 : blocking receive */
  28
  29 /* The following bit masks determine what checks that should be done. */
  30 #define CHECK_PTR       0xBB    /* 1011 1011 : validate message buffer */
  31 #define CHECK_DST       0x55    /* 0101 0101 : validate message destination */
  32 #define CHECK_DEADLOCK  0x93    /* 1001 0011 : check for deadlock */
  33
  34 #endif /* IPC_H */