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/*
* tload.c - terminal version of xload
*
* Options:
* -s initial scaling exponent (default = 6)
* -d delay
* -b background mode: don't update if window in background
* Uses less cpu time and the screen saver still works if
* the tload console is not the current console.
*
*
* Copyright (c) 1992 Branko Lankester
*/
#include <stdio.h>
#include <termios.h>
#include <signal.h>
#include <sys/stat.h>
#include <setjmp.h>
#define NR_CONSOLE 8
char *screen;
int nrows = 25;
int ncols = 80;
int scr_size;
int interv = 1;
int fd=1;
jmp_buf jb;
extern int optind;
extern char *optarg;
void
readavg(av)
long av[3];
{
FILE *fp;
fp = fopen ("/proc/loadavg", "r");
if (!fp)
av[0] = av[1] = av[2] = 0;
else
{
float a[3];
fscanf (fp, "%g %g %g", a, a + 1, a + 2);
fclose (fp);
av[0] = a[0] * 2048;
av[1] = a[1] * 2048;
av[2] = a[2] * 2048;
}
}
void
alrm(n)
{
signal(SIGALRM, alrm);
alarm(1);
}
void
setsize(i)
{
struct winsize win;
signal(SIGWINCH, setsize);
if (ioctl(fd, TIOCGWINSZ, &win) != -1) {
if (win.ws_col > 0)
ncols = win.ws_col;
if (win.ws_row > 0)
nrows = win.ws_row;
}
scr_size = nrows * ncols;
if (screen == NULL)
screen = (char *) malloc(scr_size);
else
screen = (char *) realloc(screen, scr_size);
if (screen == NULL) {
perror("");
exit(1);
}
memset(screen, ' ', scr_size-1);
*(screen + scr_size - 2) = '\0';
if (i)
longjmp(jb, 0);
}
main(argc, argv)
char **argv;
{
int row, col=0, i, opt, bgnd_mode = 0;
int lines, min_scale = 6, scale_shift;
int delay = 5;
long av[3];
while ((opt = getopt(argc, argv, "bs:d:")) != -1)
switch (opt) {
case 's': min_scale = atoi(optarg); break;
case 'd': delay = atoi(optarg); break;
case 'b': bgnd_mode = 1; break;
default:
printf("usage: tload [-b] [-d delay] [-s scale] [tty]\n");
exit(1);
}
if (argc > optind) {
if ((fd = open(argv[optind], 1)) == -1) {
perror(argv[optind]);
exit(1);
}
}
setsize(0);
scale_shift = min_scale;
setjmp(jb);
col = 0;
alrm(0);
while (1) {
int dly = delay;
if ( scale_shift > min_scale )
scale_shift--; /* help it drift back down.. */
readavg (av);
repeat:
lines = av[0] >> scale_shift;
row = nrows-1;
while (--lines >= 0) {
*(screen + row * ncols + col) = '*';
if (--row < 0) {
++scale_shift;
goto repeat;
}
}
while (row >= 0)
*(screen + row-- * ncols + col) = ' ';
for (i = 1; ; ++i) {
char *p;
row = nrows - (i*2048 >> scale_shift);
if (row < 0)
break;
if (*(p = screen + row * ncols + col) == ' ')
*p = '-';
else
*p = '+';
}
if (++col == ncols) {
--col;
memmove(screen, screen + 1, scr_size-1);
for(row = nrows-2; row >= 0; --row)
*(screen + row * ncols + col) = ' ';
}
for (i=0; i<3; ++i) {
av[i] *= 100;
av[i] >>= 11;
}
i = sprintf(screen, " %d.%02d, %d.%02d, %d.%02d",
av[0] / 100, av[0] % 100,
av[1] / 100, av[1] % 100,
av[2] / 100, av[2] % 100);
if (i>0)
screen[i] = ' ';
write(fd, "\033[H", 3);
write(fd, screen, scr_size - 1);
while (--dly >= 0)
pause();
}
}
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