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mbus_control.c

/*
 * FILE:    mbus_control.c
 * PROGRAM: RAT - controller
 * AUTHOR:  Colin Perkins 
 *
 * Copyright (c) 1999-2001 University College London
 * All rights reserved.
 */
 
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] = 
      "$Id: mbus_control.c,v 1.18 2001/01/08 20:30:02 ucaccsp Exp $";
#endif /* HIDE_SOURCE_STRINGS */

#include "config_unix.h"
#include "config_win32.h"
#include "debug.h"
#include "mbus.h"
#include "mbus_parser.h"
#include "mbus_control.h"

extern int   should_exit;
extern char *u_addr, *e_addr;
extern pid_t       pid_ui, pid_engine;

/* Mbus command reception function type */
typedef void (*mbus_rx_proc)(char *srce, char *args, void *data);

/* Tuple to associate string received with it's parsing fn */
typedef struct {
        const char   *rxname;
        mbus_rx_proc  rxproc;
} mbus_cmd_tuple;

static char *wait_token;
static char *wait_addr;

void mbus_control_wait_init(char *token)
{
      wait_token = token;
      wait_addr  = NULL;
}

char *mbus_control_wait_done(void)
{
      return wait_addr;
}

static void rx_mbus_quit(char *srce, char *args, void *data)
{
      UNUSED(srce);
      UNUSED(args);
      UNUSED(data);

        debug_msg("Got quit %s\n", srce);

      /* We mark ourselves as ready to exit. The main() will */
      /* cleanup and terminate all our subprocesses.         */
      should_exit = TRUE;
}

static void rx_mbus_bye(char *srce, char *args, void *data)
{
        pid_t pid_msgsrc, pid_cur;
        char *lc;
        int   i;

        /* Find last colon */
        for (i = 0, lc = NULL; srce[i] != 0; i++) {
                if (srce[i] == ':') {
                        lc = srce + i;
                }
        }
        assert(lc != NULL);
        /* Skip past colon, next char should okay for atoi */
        pid_msgsrc = atoi(lc + 1);
        pid_cur    = (pid_t)getpid();
        if (pid_msgsrc == pid_cur ||
            pid_msgsrc == pid_ui   ||
            pid_msgsrc == pid_engine) {
                /* We mark ourselves as ready to exit. The main() will */
                /* cleanup and terminate all our subprocesses.         */
                should_exit = TRUE;
        }
      UNUSED(args);
      UNUSED(data);
}

static void rx_mbus_waiting(char *srce, char *args, void *data)
{
      UNUSED(srce);
      UNUSED(args);
      UNUSED(data);
}

static void rx_mbus_go(char *srce, char *args, void *data)
{
      struct mbus_parser      *mp;
      char              *t;

      UNUSED(data);

      mp = mbus_parse_init(args);
      mbus_parse_str(mp, &t);
      if (strcmp(mbus_decode_str(t), wait_token) == 0) {
            wait_addr = xstrdup(srce);
      }
      mbus_parse_done(mp);
}

static void rx_mbus_hello(char *srce, char *args, void *data)
{
      UNUSED(srce);
      UNUSED(args);
      UNUSED(data);
}

static const mbus_cmd_tuple control_cmds[] = {
        { "mbus.quit",                             rx_mbus_quit },
        { "mbus.bye",                              rx_mbus_bye },
        { "mbus.waiting",                          rx_mbus_waiting },
        { "mbus.go",                               rx_mbus_go },
        { "mbus.hello",                            rx_mbus_hello },
};

#define NUM_CONTROL_CMDS sizeof(control_cmds)/sizeof(control_cmds[0])

void mbus_control_rx(char *srce, char *cmnd, char *args, void *data)
{
      uint32_t i;

      for (i=0; i < NUM_CONTROL_CMDS; i++) {
            if (strcmp(control_cmds[i].rxname, cmnd) == 0) {
                        control_cmds[i].rxproc(srce, args, data);
                  return;
            } 
      }
      debug_msg("Unknown mbus command: %s (%s)\n", cmnd, args);
}


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