programs/test1/test1.c

   1
   2 #include <signal.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <sys/ioctl.h>
   6 #include <termios.h>
   7 #include <unistd.h>
   8 #include <signal.h>
   9 #include <string.h>
  10 #include <sys/wait.h>
  11 #include <time.h>
  12 #include <sys/time.h>
  13
  14 void size_changed(int sig)
  15 {
  16         struct winsize size;
  17         int status = ioctl(0, TIOCGWINSZ, &size);
  18         if (status != -1)
  19         {
  20                 char tmp[30];
  21                 snprintf(tmp, 30, "\033[%d;%dH", size.ws_row, size.ws_col);
  22                 write(1, tmp, strlen(tmp));
  23                 write(1, "*", 1);
  24         }
  25 }
  26
  27 int main(int argc, char **argv)
  28 {
  29         signal(SIGWINCH, size_changed);
  30         // Initialize screen
  31         write(1, "\033[2J", 4);
  32         write(1, "\033[0;0H", 6);
  33         write(1, "\033[30;41m", 8);
  34         write(1, "Hello ", 6);
  35         write(1, "\033[33;40m", 8);
  36         write(1, "World!\n", 7);
  37
  38         struct winsize size;
  39         int status = ioctl(0, TIOCGWINSZ, &size);
  40         if (status != -1)
  41         {
  42                 write(1, "\033[37;40m", 8);
  43                 printf("Size: %d/%d.\n", size.ws_row, size.ws_col);
  44                 write(1, "\033[53;180H", 9);
  45                 write(1, "*", 1);
  46         }
  47
  48         write(1, "\033[4;0H", 6);
  49         int i;
  50         for (i = 0; i < argc; i++)
  51         {
  52                 printf("Arg. %d: %s\n", i, argv[i]);
  53         }
  54
  55         int time1 = time(0);
  56         struct timeval tv1;
  57         gettimeofday(&tv1, 0);
  58         write(1, "\033[30;41m", 8);
  59         write(1, "fork()!       \n", 15);
  60         for (i = 0; i < 1000; i++)
  61         {
  62                 int pid = fork();
  63                 if (!pid)
  64                 {
  65                         exit(0);
  66                 }
  67                 waitpid(pid, 0, 0);
  68         }
  69         write(1, "DONE!         \n", 15);
  70         int time2 = time(0);
  71         struct timeval tv2;
  72         gettimeofday(&tv2, 0);
  73         printf("%d seconds (%d).\n", time2 - time1, time2);
  74
  75         if (tv1.tv_usec > tv2.tv_usec)
  76         {
  77                 tv2.tv_usec += 1000000;
  78                 tv2.tv_sec -= 1;
  79         }
  80         int difference = tv2.tv_usec / 1000 - tv1.tv_usec / 1000 + tv2.tv_sec * 1000 - tv1.tv_sec * 1000;
  81         write(1, "\033[7;0H", 6);
  82         printf("%d seconds.\n", difference);
  83
  84         char c;
  85         while ((c = getchar()) != 'q')
  86         {
  87                 putchar(c);
  88         }
  89         return 0;
  90 }
  91