void
badboy_fork ()
{
int status, pid;
status = fork ();
badboy_pid = status;
if (status == 0) /* badboy */
{
#ifdef DEBUG_LATE_BADBOY
sleep(ntries*MAX_TRY_TIME+10);
#else
badboy_loop ();
#endif
exit (0); /* tough guy */
}
else if (status < 0)
perror ("fork");
else /* parent watching over badboy */
{
if (verbose_level > 3)
printf ("badboy pid = %d\n", badboy_pid);
/* don't trust the child to return at night */
my_signal (SIGALRM, monitor_fcn);
alarm (ntries*MAX_TRY_TIME);
pid = waitpid (-1, &status, WUNTRACED);
if (pid <= 0)
{
perror ("wait");
} else {
if (verbose_level > 3)
printf ("pid %d exited with status %d\n", pid, status);
#if 0
record_status(status);
#endif
}
} /* parent */
alarm(0);
}
void badboy_fork()
{
int status, pid;
pid_t child;
child = fork();
badboy_pid = status;
switch (child) {
case -1:
perror("fork");
case 0:
#ifdef DEBUG_LATE_BADBOY
sleep(ntries * MAX_TRY_TIME + 10);
#else
badboy_loop();
#endif
exit(0);
default:
if (verbose_level > 3)
printf("badboy pid = %d\n", badboy_pid);
/* don't trust the child to return at night */
my_signal(SIGALRM, monitor_fcn);
alarm(ntries * MAX_TRY_TIME);
pid = waitpid(-1, &status, WUNTRACED);
if (pid <= 0)
perror("wait");
else {
if (verbose_level > 3)
printf("pid %d exited with status %d\n",
pid, status);
#if 0
record_status(status);
#endif
}
}
alarm(0);
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
FILE* fp = NULL;
int fd;
int i;
int total_msg_cnt,cnt;
int log_flag;
u_int16_t buf_len;
char buff[BUFSIZE];
char *outputFileName;
log_flag = 1;
csi_status = (csi_struct*)malloc(sizeof(csi_struct));
/* check usage */
if (0 == nrhs){
log_flag = 0;
mexPrintf("/* log off */\n");
}
if (1 == nrhs){
mexPrintf("/* log on */\n");
mxGetString(prhs[0], buff, BUFSIZE);
sprintf(outputFileName, "%s", buff);
fp = fopen(outputFileName,"a");
if (!fp){
mexPrintf("Fail to open <output_file>, are you root?\n");
fclose(fp);
set_err_return_value(plhs, nlhs, 1);
return;
}
}
if (nrhs > 1){
mexPrintf(" Too many input arguments !\n");
set_err_return_value(plhs, nlhs, 1);
return;
}
fd = open_csi_device();
if (fd < 0){
perror("Failed to open the device...");
set_err_return_value(plhs, nlhs, errno);
return;
}
mexPrintf("#Receiving data! Press Ctrl+C to quit!\n");
quit = 0;
total_msg_cnt = 0;
while(1){
if (1 == quit)
break;
/* keep listening to the kernel and waiting for the csi report */
cnt = read_csi_buf(buf_addr,fd,BUFSIZE);
if (cnt){
total_msg_cnt += 1;
/* fill the status struct with information about the rx packet */
record_status(buf_addr, cnt, csi_status);
/*
* fill the payload buffer with the payload
* fill the CSI matrix with the extracted CSI value
*/
record_csi_payload(buf_addr, csi_status, data_buf, csi_matrix);
/* Till now, we store the packet status in the struct csi_status
* store the packet payload in the data buffer
* store the csi matrix in the csi buffer
* with all those data, we can build our own processing function!
*/
/*porcess_csi(data_buf, csi_status, csi_matrix);*/
/*Return the csi_matrix combined with csi_status properly.*/
int k, nc_idx, nr_idx;
int nr = csi_status->nr;
int nc = csi_status->nc;
int num_tones = csi_status->num_tones;
mxArray *csi = csiMatrix2mxArray(csi_matrix, nr, nc, num_tones);
const char *fieldNames[] = {"channel", "chanBW", "rate",
"nr", "nc", "num_tones",
"rssi", "rssi_0", "rssi_1",
"rssi_2", "payload_len", "csi"};
#define NUMBER_OF_FIELDS (sizeof(fieldNames)/sizeof(*fieldNames))
plhs[0] = mxCreateStructMatrix(1, 1, NUMBER_OF_FIELDS, fieldNames);
int fieldNumbers[NUMBER_OF_FIELDS];
for (k = 0; k < NUMBER_OF_FIELDS; k++)
fieldNumbers[k] = mxGetFieldNumber(plhs[0], fieldNames[k]);
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[0], mxCreateDoubleScalar((double)csi_status->channel));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[1], mxCreateDoubleScalar((double)csi_status->chanBW));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[2], mxCreateDoubleScalar((double)csi_status->rate));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[3], mxCreateDoubleScalar((double)csi_status->nr));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[4], mxCreateDoubleScalar((double)csi_status->nc));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[5], mxCreateDoubleScalar((double)csi_status->num_tones));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[6], mxCreateDoubleScalar((double)csi_status->rssi));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[7], mxCreateDoubleScalar((double)csi_status->rssi_0));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[8], mxCreateDoubleScalar((double)csi_status->rssi_1));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[9], mxCreateDoubleScalar((double)csi_status->rssi_2));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[10], mxCreateDoubleScalar((double)csi_status->payload_len));
mxSetFieldByNumber(plhs[0], 0, fieldNumbers[11], csi);
mexPrintf("Recv %dth msg with rate: 0x%02x | payload len: %d\n",total_msg_cnt,csi_status->rate,csi_status->payload_len);
/* log the received data for off-line processing */
if (log_flag){
buf_len = csi_status->buf_len;
fwrite(&buf_len,1,2,fp);
fwrite(buf_addr,1,buf_len,fp);
}
else break;
}
}
if (fp)
fclose(fp);
close_csi_device(fd);
free(csi_status);
return;
}
