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/*
* tload.c - terminal version of xload
*
* Copyright © 2009-2023 Craig Small <csmall@dropbear.xyz>
* Copyright © 2011-2023 Jim Warner <james.warner@comcast.net>
* Copyright © 2011-2012 Sami Kerola <kerolasa@iki.fi>
* Copyright © 1992 Branko Lankester
*
* /proc changes by David Engel (david@ods.com)
* Made a little more efficient by Michael K. Johnson (johnsonm@sunsite.unc.edu)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <limits.h>
#include "c.h"
#include "fileutils.h"
#include "nls.h"
#include "strutils.h"
#include "xalloc.h"
#include "misc.h"
static char *screen;
static int nrows = 25;
static int ncols = 80;
static int scr_size;
static int fd = STDOUT_FILENO;
static unsigned int dly = 5;
static jmp_buf jb;
static void alrm(int signo __attribute__ ((__unused__)))
{
signal(SIGALRM, alrm);
alarm(dly);
}
static void setsize(int 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;
}
if (ncols < 2 || ncols >= INT_MAX)
xerrx(EXIT_FAILURE, _("screen too small or too large"));
if (nrows < 2 || nrows >= INT_MAX / ncols)
xerrx(EXIT_FAILURE, _("screen too small or too large"));
scr_size = nrows * ncols;
if (scr_size < 2)
xerrx(EXIT_FAILURE, _("screen too small"));
if (screen == NULL)
screen = (char *)xmalloc(scr_size);
else
screen = (char *)xrealloc(screen, scr_size);
memset(screen, ' ', scr_size - 1);
*(screen + scr_size - 2) = '\0';
if (i)
longjmp(jb, 1);
}
static void __attribute__ ((__noreturn__)) usage(FILE * out)
{
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] [tty]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -d, --delay <secs> update delay in seconds\n"), out);
fputs(_(" -s, --scale <num> vertical scale\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("tload(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int lines, row, col = 0;
int i, opt;
double av[3];
static double max_scale = 0, scale_fact;
long tmpdly;
static const struct option longopts[] = {
{"scale", required_argument, NULL, 's'},
{"delay", required_argument, NULL, 'd'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{NULL, 0, NULL, 0}
};
#ifdef HAVE_PROGRAM_INVOCATION_NAME
program_invocation_name = program_invocation_short_name;
#endif
setlocale (LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((opt =
getopt_long(argc, argv, "s:d:Vh", longopts, NULL)) != -1)
switch (opt) {
case 's':
max_scale = strtod_or_err(optarg, _("failed to parse argument"));
if (max_scale < 0)
xerrx(EXIT_FAILURE, _("scale cannot be negative"));
break;
case 'd':
tmpdly = strtol_or_err(optarg, _("failed to parse argument"));
if (tmpdly < 1)
xerrx(EXIT_FAILURE, _("delay must be positive integer"));
else if (UINT_MAX < tmpdly)
xerrx(EXIT_FAILURE, _("too large delay value"));
dly = tmpdly;
break;
case 'V':
printf(PROCPS_NG_VERSION);
return EXIT_SUCCESS;
break;
case 'h':
usage(stdout);
default:
usage(stderr);
}
if (argc > optind)
if ((fd = open(argv[optind], O_WRONLY)) == -1)
xerr(EXIT_FAILURE, _("can not open tty"));
setsize(0);
if (max_scale == 0)
max_scale = nrows;
scale_fact = max_scale;
setjmp(jb);
col = 0;
alrm(0);
while (1) {
int rc;
if (scale_fact < max_scale)
scale_fact *= 2.0; /* help it drift back up. */
if ((rc = procps_loadavg(&av[0], &av[1], &av[2])) < 0)
{
if (rc == -ENOENT)
xerrx(EXIT_FAILURE,
_("Load average file /proc/loadavg does not exist"));
else
xerrx(EXIT_FAILURE,
_("Unable to get load average"));
}
do {
lines = av[0] * scale_fact;
row = nrows - 1;
while (0 <= --lines) {
*(screen + row * ncols + col) = '*';
if (--row < 0) {
scale_fact /= 2.0;
break;
}
}
} while (0 <= lines);
while (row >= 0)
*(screen + row-- * ncols + col) = ' ';
for (i = 1;; ++i) {
char *p;
row = nrows - (i * scale_fact);
if (row < 0 || row >= nrows)
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) = ' ';
}
i = snprintf(screen, scr_size, " %.2f, %.2f, %.2f", av[0], av[1], av[2]);
if (i > 0 && i < scr_size)
screen[i] = ' ';
if (write(fd, "\033[H", 3) < 0)
xerr(EXIT_FAILURE, _("writing to tty failed"));
if (write(fd, screen, scr_size - 1) < 0)
xerr(EXIT_FAILURE, _("writing to tty failed"));
pause();
}
}
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