git.itanic.dy.fi Git - log-plotter/blob - main.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <sys/epoll.h>
   4
   5 #include "options.h"
   6 #include "baud.h"
   7
   8 int main(int argc, char *argv[])
   9 {
  10         struct epoll_event ev;
  11         struct plotter_options options;
  12         int fd, baud, ret;
  13         int epoll_fd;
  14         char buf[256];
  15
  16
  17         if (read_args(argc, argv, &options))
  18                 return 1;
  19
  20         baud = options.baud_rate;
  21         fd = open_at_baud(options.device_path, &baud);
  22         if (fd < 0)
  23                 return 1;
  24
  25         if (baud != options.baud_rate) {
  26                 printf("Failed to set baudrate to %d, only got %d\n",
  27                         options.baud_rate, baud);
  28                 close(fd);
  29                 return 1;
  30         }
  31
  32         epoll_fd = epoll_create(1);
  33
  34         ev.events = EPOLLIN;
  35         ev.data.fd = fd;
  36         if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
  37                 perror("epoll_ctl");
  38                 return 1;
  39         }
  40
  41         while (1) {
  42                 ret = epoll_wait(epoll_fd, &ev, 1, -1);
  43                 if (ret == 0)
  44                         continue;
  45
  46                 if (ret < 0) {
  47                         perror("epoll");
  48                         return 1;
  49                 }
  50
  51                 ret = read(fd, buf, sizeof(buf));
  52                 if (read < 0) {
  53                         perror("read");
  54                         break;
  55                 }
  56
  57                 if (ret == 0)
  58                         break;
  59
  60                 ret = write(1, buf, ret);
  61                 if (read < 0) {
  62                         perror("write");
  63                         break;
  64                 }
  65         }
  66
  67         close(fd);
  68         return 0;
  69 }