FreeBSD/Linux Kernel Cross Reference
sys/kernel/ipc.h

     #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    0x0F    /* mask for system call function */
    #define SYSCALL_FLAGS   0xF0    /* mask for system call flags */
    #define NON_BLOCKING    0x10    /* prevent blocking, return error */
    
    /* 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    /* 0 0 0 1 : blocking send */
    #define RECEIVE            2    /* 0 0 1 0 : blocking receive */
    #define SENDREC            3    /* 0 0 1 1 : SEND + RECEIVE */
    #define NOTIFY             4    /* 0 1 0 0 : nonblocking notify */
    #define ECHO               8    /* 1 0 0 0 : echo a message */
    
    /* The following bit masks determine what checks that should be done. */
    #define CHECK_PTR       0x0B    /* 1 0 1 1 : validate message buffer */
    #define CHECK_DST       0x05    /* 0 1 0 1 : validate message destination */
    #define CHECK_SRC       0x02    /* 0 0 1 0 : validate message source */
    #define CHECK_DEADLOCK  0x03    /* 0 0 1 1 : check for deadlock */
    
    #endif /* IPC_H */

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