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main.cpp
160 lines (146 loc) · 3.82 KB
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main.cpp
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#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <poll.h>
#include <sys/time.h>
#include <string>
#include "led.h"
#include "cmd.h"
#define FIFO_FILE "/tmp/LED_FIFO"
#define BUFSIZE 512
Cmd *createCmd(){
Cmd *cmd = new Cmd;
int n = cmd->addCommand("set-led-state", Led::setState, true);
cmd->addCommandArg(n, "off", 0);
cmd->addCommandArg(n, "on", 1);
n = cmd->addCommand("get-led-state", Led::getState, false);
cmd->addCommandArg(n, "off", 0);
cmd->addCommandArg(n, "on", 1);
n = cmd->addCommand("set-led-color", Led::setColor, true);
cmd->addCommandArg(n, "red", RED);
cmd->addCommandArg(n, "green", GREEN);
cmd->addCommandArg(n, "blue", BLUE);
n = cmd->addCommand("get-led-color", Led::getColor, false);
cmd->addCommandArg(n, "red", RED);
cmd->addCommandArg(n, "green", GREEN);
cmd->addCommandArg(n, "blue", BLUE);
n = cmd->addCommand("set-led-rate", Led::setRate, true);
cmd->addCommandArg(n, "0", 0);
cmd->addCommandArg(n, "1", 1);
cmd->addCommandArg(n, "2", 2);
cmd->addCommandArg(n, "3", 3);
cmd->addCommandArg(n, "4", 4);
cmd->addCommandArg(n, "5", 5);
n = cmd->addCommand("get-led-rate", Led::getRate, false);
cmd->addCommandArg(n, "0", 0);
cmd->addCommandArg(n, "1", 1);
cmd->addCommandArg(n, "2", 2);
cmd->addCommandArg(n, "3", 3);
cmd->addCommandArg(n, "4", 4);
cmd->addCommandArg(n, "5", 5);
return cmd;
}
void *threadFn(void *arg){
int fd;
struct pollfd fds;
char buf[BUFSIZE];
char fifo[BUFSIZE];
struct stat st;
void **arr = (void**)arg;
char *target = (char*)arr[0];
int polr = 0;
bzero(fifo, BUFSIZE);
strcpy(fifo, target);
Cmd *cmd = (Cmd*)arr[1];
fd = open(fifo, O_RDONLY);
if (!fd) {
fprintf(stderr, "Can not open %s\n", fifo);
return NULL;
}
fds.fd = fd;
fds.events = POLLIN;
polr = poll(&fds, 1, 1000);
if (polr < 0) {
fprintf(stderr, "Poll error for %s\n", fifo);
return NULL;
}
if (!polr) {
fprintf(stderr, "Can not read from %s by timeout\n", fifo);
if (!stat(fifo, &st)) unlink(fifo);
return NULL;
}
FILE *fp = fdopen(fd, "r");
if (!fp) {
fprintf(stderr, "Can not read %s\n", fifo);
return NULL;
}
fgets(buf, BUFSIZE, fp);
fclose(fp);
if (buf[BUFSIZE - 1]) {
fprintf(stderr, "Recieved string is too long, exit\n");
return NULL;
}
cmd->exec(buf, BUFSIZE);
fp = fopen(fifo, "w");
if (!fp) {
fprintf(stderr, "Can not write to %s\n", fifo);
return NULL;
}
fwrite(buf, 1, strlen(buf), fp);
fclose(fp);
sleep(1);
if (!stat(fifo, &st)) unlink(fifo);
return NULL;
}
void sigHandler(int s){
unlink(FIFO_FILE);
_exit(0);
}
int main(int argc, char **argv){
char buf[BUFSIZE];
FILE *fp;
Led led;
Cmd *cmd;
struct sigaction new_action;
if ((argc > 1) && !strcmp(argv[1], "-d")) {
pid_t pid = fork();
if (pid < 0) {
fprintf(stderr, "Can not fork\n");
return -1;
}
if (pid) return 0;
}
new_action.sa_handler = sigHandler;
sigemptyset (&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction (SIGINT, &new_action, NULL);
sigaction (SIGHUP, &new_action, NULL);
sigaction (SIGTERM, &new_action, NULL);
cmd = createCmd();
umask(0);
mknod(FIFO_FILE, S_IFIFO|0666, 0);
while (1) {
struct stat st;
void *arr[2];
fp = fopen(FIFO_FILE, "r");
fgets(buf, BUFSIZE, fp);
fclose(fp);
if (buf[BUFSIZE - 1]) {
fprintf(stderr, "Recieved string is too long, continue\n");
continue;
}
buf[strlen(buf) - 1] = 0;
if (!stat(buf, &st) && S_ISFIFO(st.st_mode)) {
pthread_t th;
arr[0] = buf;
arr[1] = cmd;
pthread_create(&th, NULL, threadFn, arr);
pthread_detach(th);
}
}
return 0;
}