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         int time1 = time(0);
  49         struct timeval tv1;
  50         gettimeofday(&tv1, 0);
  51         write(1, "\033[30;41m", 8);
  52         write(1, "\033[4;0H", 6);
  53         write(1, "fork()!       ", 14);
  54         int i;
  55         for (i = 0; i < 1000; i++)
  56         {
  57                 int pid = fork();
  58                 if (!pid)
  59                 {
  60                         exit(0);
  61                 }
  62                 waitpid(pid, 0, 0);
  63         }
  64         write(1, "\033[5;0H", 6);
  65         write(1, "DONE!         ", 14);
  66         int time2 = time(0);
  67         struct timeval tv2;
  68         gettimeofday(&tv2, 0);
  69         write(1, "\033[6;0H", 6);
  70         printf("%d seconds (%d).\n", time2 - time1, time2);
  71
  72         if (tv1.tv_usec > tv2.tv_usec)
  73         {
  74                 tv2.tv_usec += 1000000;
  75                 tv2.tv_sec -= 1;
  76         }
  77         int difference = tv2.tv_usec / 1000 - tv1.tv_usec / 1000 + tv2.tv_sec * 1000 - tv1.tv_sec * 1000;
  78         write(1, "\033[7;0H", 6);
  79         printf("%d seconds.\n", difference);
  80
  81         char c;
  82         while ((c = getchar()) != 'q')
  83         {
  84                 putchar(c);
  85         }
  86         return 0;
  87 }
  88