411 lines
8.7 KiB
C
411 lines
8.7 KiB
C
/* $NetBSD: main.c,v 1.46 2011/09/06 18:31:44 joerg Exp $ */
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/*-
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* Copyright (c) 1980, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\
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The Regents of the University of California. All rights reserved.");
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#if 0
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static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: main.c,v 1.46 2011/09/06 18:31:44 joerg Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <ctype.h>
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#include <err.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include "systat.h"
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#include "extern.h"
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static struct nlist namelist[] = {
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#define X_FIRST 0
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#define X_HZ 0
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{ .n_name = "_hz" },
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#define X_STATHZ 1
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{ .n_name = "_stathz" },
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#define X_MAXSLP 2
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{ .n_name = "_maxslp" },
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{ .n_name = NULL }
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};
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static int dellave;
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kvm_t *kd;
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char *memf = NULL;
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char *nlistf = NULL;
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sig_t sigtstpdfl;
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double avenrun[3];
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int col;
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int naptime = 5;
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int verbose = 1; /* to report kvm read errs */
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int hz, stathz, maxslp;
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char c;
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char *namp;
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char hostname[MAXHOSTNAMELEN + 1];
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WINDOW *wnd;
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int CMDLINE;
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int turns = 2; /* stay how many refresh-turns in 'all' mode? */
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int allflag;
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int allcounter;
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sig_atomic_t needsredraw = 0;
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int use_sysctl = 1;
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static WINDOW *wload; /* one line window for load average */
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static void (*sv_stop_handler)(int);
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static void stop(int);
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__dead static void usage(void);
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gid_t egid; /* XXX needed by initiostat() and initkre() */
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int
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main(int argc, char **argv)
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{
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int ch;
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char errbuf[_POSIX2_LINE_MAX];
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const char *all;
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all = "all";
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egid = getegid();
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(void)setegid(getgid());
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while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -1)
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switch(ch) {
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case 'M':
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memf = optarg;
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use_sysctl = 0;
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break;
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case 'N':
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nlistf = optarg;
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break;
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case 'n':
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nflag = !nflag;
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break;
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case 'w':
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if ((naptime = atoi(optarg)) <= 0)
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errx(1, "interval <= 0.");
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break;
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case 't':
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if ((turns = atoi(optarg)) <= 0)
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errx(1, "turns <= 0.");
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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for ( ; argc > 0; argc--, argv++) {
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struct mode *p;
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int modefound = 0;
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if (isdigit((unsigned char)argv[0][0])) {
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naptime = atoi(argv[0]);
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if (naptime <= 0)
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naptime = 5;
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continue;
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}
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for (p = modes; p->c_name ; p++) {
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if (strstr(p->c_name, argv[0]) == p->c_name) {
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curmode = p;
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modefound++;
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break;
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}
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if (strstr(all, argv[0]) == all) {
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allcounter=0;
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allflag=1;
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}
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}
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if (!modefound && !allflag)
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error("%s: Unknown command.", argv[0]);
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}
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/*
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* Discard setgid privileges. If not the running kernel, we toss
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* them away totally so that bad guys can't print interesting stuff
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* from kernel memory, otherwise switch back to kmem for the
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* duration of the kvm_openfiles() call.
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*/
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if (nlistf != NULL || memf != NULL)
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(void)setgid(getgid());
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else
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(void)setegid(egid);
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kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
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if (kd == NULL) {
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error("%s", errbuf);
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exit(1);
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}
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/* Get rid of privs for now. */
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if (nlistf == NULL && memf == NULL)
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(void)setegid(getgid());
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if (kvm_nlist(kd, namelist)) {
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if (nlistf)
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errx(1, "%s: no namelist", nlistf);
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else
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errx(1, "no namelist");
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}
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signal(SIGINT, die);
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signal(SIGQUIT, die);
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signal(SIGTERM, die);
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sv_stop_handler = signal(SIGTSTP, stop);
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/*
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* Initialize display. Load average appears in a one line
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* window of its own. Current command's display appears in
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* an overlapping sub-window of stdscr configured by the display
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* routines to minimize update work by curses.
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*/
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if (initscr() == NULL)
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{
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warnx("couldn't initialize screen");
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exit(0);
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}
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CMDLINE = LINES - 1;
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wnd = (*curmode->c_open)();
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if (wnd == NULL) {
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warnx("couldn't initialize display");
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die(0);
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}
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wload = newwin(1, 0, 3, 20);
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if (wload == NULL) {
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warnx("couldn't set up load average window");
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die(0);
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}
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gethostname(hostname, sizeof (hostname));
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hostname[sizeof(hostname) - 1] = '\0';
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NREAD(X_HZ, &hz, sizeof hz);
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NREAD(X_STATHZ, &stathz, sizeof stathz);
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NREAD(X_MAXSLP, &maxslp, sizeof maxslp);
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(*curmode->c_init)();
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curmode->c_flags |= CF_INIT;
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labels();
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dellave = 0.0;
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display(0);
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noecho();
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cbreak();
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keyboard();
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/*NOTREACHED*/
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
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"[-t turns]\n\t\t[display] [refresh-interval]\n");
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exit(1);
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}
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void
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labels(void)
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{
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if (curmode->c_flags & CF_LOADAV) {
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mvaddstr(2, 20,
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"/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10");
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mvaddstr(3, 5, "Load Average");
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}
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(*curmode->c_label)();
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#ifdef notdef
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mvprintw(21, 25, "CPU usage on %s", hostname);
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#endif
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refresh();
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}
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void
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display(int signo)
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{
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static int skip;
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int j;
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struct mode *p;
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int ms_delay;
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if (signo == SIGALRM && skip-- > 0)
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/* Don't display on this timeout */
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return;
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/* Get the load average over the last minute. */
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(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
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(*curmode->c_fetch)();
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if (curmode->c_flags & CF_LOADAV) {
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j = 5.0*avenrun[0] + 0.5;
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dellave -= avenrun[0];
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if (dellave >= 0.0)
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c = '<';
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else {
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c = '>';
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dellave = -dellave;
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}
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if (dellave < 0.1)
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c = '|';
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dellave = avenrun[0];
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wmove(wload, 0, 0);
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wclrtoeol(wload);
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whline(wload, c, (j > 50) ? 50 : j);
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if (j > 50)
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wprintw(wload, " %4.1f", avenrun[0]);
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}
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(*curmode->c_refresh)();
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if (curmode->c_flags & CF_LOADAV)
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wrefresh(wload);
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wrefresh(wnd);
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move(CMDLINE, col);
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refresh();
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if (allflag && signo==SIGALRM) {
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if (allcounter >= turns){
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p = curmode;
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p++;
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if (p->c_name == NULL)
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p = modes;
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switch_mode(p);
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allcounter=0;
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} else
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allcounter++;
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}
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/* curses timeout() uses VTIME, limited to 255 1/10th secs */
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ms_delay = naptime * 1000;
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if (ms_delay < 25500) {
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timeout(ms_delay);
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skip = 0;
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} else {
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skip = ms_delay / 25500;
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timeout(ms_delay / (skip + 1));
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}
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}
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void
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redraw(void)
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{
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resizeterm(LINES, COLS);
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CMDLINE = LINES - 1;
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labels();
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display(0);
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needsredraw = 0;
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}
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static void
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stop(int signo)
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{
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sigset_t set;
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signal(SIGTSTP, sv_stop_handler);
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/* unblock SIGTSTP */
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sigemptyset(&set);
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sigaddset(&set, SIGTSTP);
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sigprocmask(SIG_UNBLOCK, &set, NULL);
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/* stop ourselves */
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kill(0, SIGTSTP);
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/* must have been restarted */
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signal(SIGTSTP, stop);
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needsredraw = signo;
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}
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void
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die(int signo)
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{
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move(CMDLINE, 0);
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clrtoeol();
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refresh();
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endwin();
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exit(0);
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}
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void
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error(const char *fmt, ...)
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{
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va_list ap;
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char buf[255];
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int oy, ox;
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va_start(ap, fmt);
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if (wnd) {
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getyx(stdscr, oy, ox);
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(void) vsnprintf(buf, sizeof(buf), fmt, ap);
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clrtoeol();
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standout();
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mvaddstr(CMDLINE, 0, buf);
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standend();
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move(oy, ox);
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refresh();
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} else {
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(void) vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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}
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va_end(ap);
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}
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void
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nlisterr(struct nlist name_list[])
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{
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int i, n;
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n = 0;
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clear();
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mvprintw(2, 10, "systat: nlist: can't find following symbols:");
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for (i = 0;
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name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
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if (name_list[i].n_value == 0)
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mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
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move(CMDLINE, 0);
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clrtoeol();
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refresh();
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sleep(5);
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endwin();
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exit(1);
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}
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