message_passing.h

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#ifndef _MESSAGE_PASSING_H_INCLUDED
#define _MESSAGE_PASSING_H_INCLUDED
 
// XXX: I'm very much not happy with this file, the definitions in here and the
//      names in the global namespace this uses.
//      Sadly, this is a very core part of the system ..
//      Still, expect random changes to those definitions, their names and co -
//      the overall logic of message passing in LF OS feels sensible though, so
//      far at least.
//
//      -- Fox, 2023-10-25
 
#include <stdint.h>
#include <stdbool.h>
#include <uuid.h>
 
#ifndef __kernel
#   include <sys/types.h>
#endif
 
enum MessageType {
    MT_Invalid,
 
    MT_IO,
    MT_Signal,
    MT_HardwareInterrupt,
    MT_ServiceDiscovery,
 
    MT_UserDefined = 1024,
};
 
struct Message {
    size_t size;
 
    size_t user_size;
 
    pid_t sender;
 
    enum MessageType type;
 
    union UserData {
        struct IOUserData {
            int  fd;
 
            char data[0];
        } IO;
 
        struct SignalUserData {
            uint16_t signal;
        } Signal;
 
        struct HardwareInterruptUserData {
            uint16_t interrupt;
        } HardwareInterrupt;
 
        struct ServiceDiscoveryData {
            uuid_t   serviceIdentifier;
            bool     response;
            uint64_t mq;
            char     discoveryData[0];
        } ServiceDiscovery;
 
        char raw[0];
    } user_data;
}__attribute__((packed));
 
#endif