int main(int argc, char **argv) {
int iResult=0;
struct message *trans_message;
char buf_message[BUFSIZE];
FILE *pFile;
trans_message = (struct message *)malloc(sizeof(struct message));
pFile = fopen("/dev/gpio", "r+");
// Check if in read mode
if (argc == 2 && strcmp(argv[1], "-r") == 0)
{
while (fgets(buf_message, 256, pFile) != NULL)
{
sscanf(buf_message,"%d %s",&trans_message->value,trans_message->mes);
printf("value: %d message: %s\n", trans_message->value,trans_message->mes);
}
}
// Check if in write mode
else if (argc == 4 && strcmp(argv[1], "-w") == 0)
{
trans_message->value=atoi(argv[2]);
strncpy(trans_message->mes, argv[3], BUFSIZE);
iResult=sprintf(buf_message,"%d %s\n",trans_message->value,trans_message->mes);
fwrite(&buf_message,iResult,1,pFile);
}
// Otherwise invalid
else
{
printManPage();
}
if(trans_message) free(trans_message);
fclose(pFile);
return 0;
}
int main(int argc, char **argv) {
char line[128], line2[128];
int ii=0, count = 0, oflags, pFile;
char buffer[128];
struct sigaction action, oa;
/* Check to see if the nibbler successfully has mknod run
Assumes that nibbler is tied to /dev/nibbler */
pFile = open("/dev/mytimer", O_RDWR);
if (pFile < 0) {
fprintf (stderr, "mytimer_example module isn't loaded\n");
return 1;
}
if (argc == 2 && strcmp(argv[1], "-l") == 0) {
read(pFile,line, 128);
while(line[ii]!='\0')
{if(line[ii]=='/')
line[ii]='\n';
ii++;
}
printf("%s", line);
}
// Check if in timer set mode
else if (argc == 4 && strcmp(argv[1], "-s") == 0)
{
int i=0, j=0;
for(i; *(*(argv + 2) + i) != '\0'; i++)
buffer[i] = *(*(argv + 2) + i);
buffer[i++]=' ';
for(j;*(*(argv + 3) + j) != '\0';i++,j++)
buffer[i]= *(*(argv + 3) + j);
buffer[i]='\0';
/* Scanning buffer */
read(pFile,line2, 128);
ii=0;
if(line2[ii]=='\0'){
write(pFile, buffer, (strlen(buffer)+1));
args= *(argv+3);
//printf("Message inputted: %s",buffer);
memset(&action, 0, sizeof(action));
action.sa_handler = sighandler;
action.sa_flags = SA_SIGINFO;
sigemptyset(&action.sa_mask);
sigaction(SIGIO, &action, NULL);
fcntl(pFile, F_SETOWN, getpid());
oflags = fcntl(pFile, F_GETFL);
fcntl(pFile, F_SETFL, oflags | FASYNC);
//printf("Sleep\n");
pause();
}
else{
while(line2[ii]!=' ')
ii++;
char string1[ii+1];
ii=0;
while(line2[ii]!=' ')
{string1[ii]=line2[ii];
ii++;
}
string1[ii]='\0';
ii++;
int delay=0;
if(strcmp(argv[3],string1)==0)
{
while(line2[ii]!='\0')
{if(line2[ii]!='/')
delay = delay * 10 + (line2[ii]-'0');
ii++;
}
printf("Timer %s already exists and has %d seconds remaining to expiration!\n",string1,delay);
}
else
printf("A timer exists already\n");
}
}
// Otherwise invalid
else {
printManPage();
}
close(pFile);
return 0;
}
