shutdown.c revision 48062
11558Srgrimes/* 21558Srgrimes * Copyright (c) 1988, 1990, 1993 31558Srgrimes * The Regents of the University of California. All rights reserved. 41558Srgrimes * 51558Srgrimes * Redistribution and use in source and binary forms, with or without 61558Srgrimes * modification, are permitted provided that the following conditions 71558Srgrimes * are met: 81558Srgrimes * 1. Redistributions of source code must retain the above copyright 91558Srgrimes * notice, this list of conditions and the following disclaimer. 101558Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111558Srgrimes * notice, this list of conditions and the following disclaimer in the 121558Srgrimes * documentation and/or other materials provided with the distribution. 131558Srgrimes * 3. All advertising materials mentioning features or use of this software 141558Srgrimes * must display the following acknowledgement: 151558Srgrimes * This product includes software developed by the University of 161558Srgrimes * California, Berkeley and its contributors. 171558Srgrimes * 4. Neither the name of the University nor the names of its contributors 181558Srgrimes * may be used to endorse or promote products derived from this software 191558Srgrimes * without specific prior written permission. 201558Srgrimes * 211558Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221558Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231558Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241558Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251558Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261558Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271558Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281558Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291558Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301558Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311558Srgrimes * SUCH DAMAGE. 321558Srgrimes */ 331558Srgrimes 341558Srgrimes#ifndef lint 3538036Scharnierstatic const char copyright[] = 361558Srgrimes"@(#) Copyright (c) 1988, 1990, 1993\n\ 371558Srgrimes The Regents of the University of California. All rights reserved.\n"; 381558Srgrimes#endif /* not lint */ 391558Srgrimes 401558Srgrimes#ifndef lint 4138036Scharnier#if 0 4241684Sbdestatic char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 4/28/95"; 4338036Scharnier#endif 4438036Scharnierstatic const char rcsid[] = 4548062Sjkoshy "$Id: shutdown.c,v 1.17 1999/06/18 14:26:07 ru Exp $"; 461558Srgrimes#endif /* not lint */ 471558Srgrimes 481558Srgrimes#include <sys/param.h> 491558Srgrimes#include <sys/time.h> 501558Srgrimes#include <sys/resource.h> 511558Srgrimes#include <sys/syslog.h> 521558Srgrimes 531558Srgrimes#include <ctype.h> 5438036Scharnier#include <err.h> 551558Srgrimes#include <fcntl.h> 561558Srgrimes#include <pwd.h> 571558Srgrimes#include <setjmp.h> 581558Srgrimes#include <signal.h> 591558Srgrimes#include <stdio.h> 601558Srgrimes#include <stdlib.h> 611558Srgrimes#include <string.h> 621558Srgrimes#include <unistd.h> 631558Srgrimes 641558Srgrimes#include "pathnames.h" 651558Srgrimes 661558Srgrimes#ifdef DEBUG 671558Srgrimes#undef _PATH_NOLOGIN 681558Srgrimes#define _PATH_NOLOGIN "./nologin" 691558Srgrimes#endif 701558Srgrimes 711558Srgrimes#define H *60*60 721558Srgrimes#define M *60 731558Srgrimes#define S *1 741558Srgrimes#define NOLOG_TIME 5*60 751558Srgrimesstruct interval { 761558Srgrimes int timeleft, timetowait; 771558Srgrimes} tlist[] = { 7832399Salex { 10 H, 5 H }, 7932399Salex { 5 H, 3 H }, 8032399Salex { 2 H, 1 H }, 8132399Salex { 1 H, 30 M }, 8232399Salex { 30 M, 10 M }, 8332399Salex { 20 M, 10 M }, 8432399Salex { 10 M, 5 M }, 8532399Salex { 5 M, 3 M }, 8632399Salex { 2 M, 1 M }, 8732399Salex { 1 M, 30 S }, 8832399Salex { 30 S, 30 S }, 8932399Salex { 0 , 0 } 901558Srgrimes}; 911558Srgrimes#undef H 921558Srgrimes#undef M 931558Srgrimes#undef S 941558Srgrimes 951558Srgrimesstatic time_t offset, shuttime; 9641666Smsmithstatic int dohalt, dopower, doreboot, killflg, mbuflen; 971558Srgrimesstatic char *nosync, *whom, mbuf[BUFSIZ]; 981558Srgrimes 991558Srgrimesvoid badtime __P((void)); 1001558Srgrimesvoid die_you_gravy_sucking_pig_dog __P((void)); 1011558Srgrimesvoid finish __P((int)); 1021558Srgrimesvoid getoffset __P((char *)); 1031558Srgrimesvoid loop __P((void)); 1041558Srgrimesvoid nolog __P((void)); 1051558Srgrimesvoid timeout __P((int)); 1061558Srgrimesvoid timewarn __P((int)); 1071558Srgrimesvoid usage __P((void)); 1081558Srgrimes 1091558Srgrimesint 1101558Srgrimesmain(argc, argv) 1111558Srgrimes int argc; 1121558Srgrimes char *argv[]; 1131558Srgrimes{ 1141558Srgrimes register char *p, *endp; 1151558Srgrimes struct passwd *pw; 1161558Srgrimes int arglen, ch, len, readstdin; 1171558Srgrimes 1181558Srgrimes#ifndef DEBUG 11926737Scharnier if (geteuid()) 12026737Scharnier errx(1, "NOT super-user"); 1211558Srgrimes#endif 1221558Srgrimes nosync = NULL; 1231558Srgrimes readstdin = 0; 12441666Smsmith while ((ch = getopt(argc, argv, "-hknpr")) != -1) 1251558Srgrimes switch (ch) { 1261558Srgrimes case '-': 1271558Srgrimes readstdin = 1; 1281558Srgrimes break; 1291558Srgrimes case 'h': 1301558Srgrimes dohalt = 1; 1311558Srgrimes break; 1321558Srgrimes case 'k': 1331558Srgrimes killflg = 1; 1341558Srgrimes break; 1351558Srgrimes case 'n': 1361558Srgrimes nosync = "-n"; 1371558Srgrimes break; 13841666Smsmith case 'p': 13941666Smsmith dopower = 1; 14041666Smsmith break; 1411558Srgrimes case 'r': 1421558Srgrimes doreboot = 1; 1431558Srgrimes break; 1441558Srgrimes case '?': 1451558Srgrimes default: 1461558Srgrimes usage(); 1471558Srgrimes } 1481558Srgrimes argc -= optind; 1491558Srgrimes argv += optind; 1501558Srgrimes 1511558Srgrimes if (argc < 1) 1521558Srgrimes usage(); 1531558Srgrimes 15448062Sjkoshy if (killflg + doreboot + dohalt + dopower > 1) { 15548062Sjkoshy warnx("incompatible switches -h, -k, -p and -r"); 1561558Srgrimes usage(); 1571558Srgrimes } 15848062Sjkoshy 15948062Sjkoshy if (killflg && nosync) 16048062Sjkoshy warnx("option -n ignored with -k"); 16148062Sjkoshy 1621558Srgrimes getoffset(*argv++); 1631558Srgrimes 1641558Srgrimes if (*argv) { 1651558Srgrimes for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 1661558Srgrimes arglen = strlen(*argv); 1671558Srgrimes if ((len -= arglen) <= 2) 1681558Srgrimes break; 1691558Srgrimes if (p != mbuf) 1701558Srgrimes *p++ = ' '; 17141684Sbde memmove(p, *argv, arglen); 1721558Srgrimes p += arglen; 1731558Srgrimes } 1741558Srgrimes *p = '\n'; 1751558Srgrimes *++p = '\0'; 1761558Srgrimes } 1771558Srgrimes 1781558Srgrimes if (readstdin) { 1791558Srgrimes p = mbuf; 1801558Srgrimes endp = mbuf + sizeof(mbuf) - 2; 1811558Srgrimes for (;;) { 1821558Srgrimes if (!fgets(p, endp - p + 1, stdin)) 1831558Srgrimes break; 1841558Srgrimes for (; *p && p < endp; ++p); 1851558Srgrimes if (p == endp) { 1861558Srgrimes *p = '\n'; 1871558Srgrimes *++p = '\0'; 1881558Srgrimes break; 1891558Srgrimes } 1901558Srgrimes } 1911558Srgrimes } 1921558Srgrimes mbuflen = strlen(mbuf); 1931558Srgrimes 1941558Srgrimes if (offset) 1951558Srgrimes (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 1961558Srgrimes else 1971558Srgrimes (void)printf("Shutdown NOW!\n"); 1981558Srgrimes 1991558Srgrimes if (!(whom = getlogin())) 2001558Srgrimes whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 2011558Srgrimes 2021558Srgrimes#ifdef DEBUG 2031558Srgrimes (void)putc('\n', stdout); 2041558Srgrimes#else 2051558Srgrimes (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 2061558Srgrimes { 2071558Srgrimes int forkpid; 2081558Srgrimes 2091558Srgrimes forkpid = fork(); 21026737Scharnier if (forkpid == -1) 21126737Scharnier err(1, "fork"); 21226737Scharnier if (forkpid) 21326737Scharnier errx(0, "[pid %d]", forkpid); 2141558Srgrimes } 21528613Sjoerg setsid(); 2161558Srgrimes#endif 2171558Srgrimes openlog("shutdown", LOG_CONS, LOG_AUTH); 2181558Srgrimes loop(); 21938036Scharnier return(0); 2201558Srgrimes} 2211558Srgrimes 2221558Srgrimesvoid 2231558Srgrimesloop() 2241558Srgrimes{ 2251558Srgrimes struct interval *tp; 2261558Srgrimes u_int sltime; 2271558Srgrimes int logged; 2281558Srgrimes 2291558Srgrimes if (offset <= NOLOG_TIME) { 2301558Srgrimes logged = 1; 2311558Srgrimes nolog(); 2321558Srgrimes } 2331558Srgrimes else 2341558Srgrimes logged = 0; 2351558Srgrimes tp = tlist; 2361558Srgrimes if (tp->timeleft < offset) 2371558Srgrimes (void)sleep((u_int)(offset - tp->timeleft)); 2381558Srgrimes else { 23948004Sru while (tp->timeleft && offset < tp->timeleft) 2401558Srgrimes ++tp; 2411558Srgrimes /* 2421558Srgrimes * Warn now, if going to sleep more than a fifth of 2431558Srgrimes * the next wait time. 2441558Srgrimes */ 24532399Salex if ((sltime = offset - tp->timeleft)) { 2461558Srgrimes if (sltime > tp->timetowait / 5) 2471558Srgrimes timewarn(offset); 2481558Srgrimes (void)sleep(sltime); 2491558Srgrimes } 2501558Srgrimes } 2511558Srgrimes for (;; ++tp) { 2521558Srgrimes timewarn(tp->timeleft); 2531558Srgrimes if (!logged && tp->timeleft <= NOLOG_TIME) { 2541558Srgrimes logged = 1; 2551558Srgrimes nolog(); 2561558Srgrimes } 2571558Srgrimes (void)sleep((u_int)tp->timetowait); 2581558Srgrimes if (!tp->timeleft) 2591558Srgrimes break; 2601558Srgrimes } 2611558Srgrimes die_you_gravy_sucking_pig_dog(); 2621558Srgrimes} 2631558Srgrimes 2641558Srgrimesstatic jmp_buf alarmbuf; 2651558Srgrimes 26632399Salexstatic char *restricted_environ[] = { 26732399Salex "PATH=" _PATH_STDPATH, 26832399Salex NULL 26932399Salex}; 27032399Salex 2711558Srgrimesvoid 2721558Srgrimestimewarn(timeleft) 2731558Srgrimes int timeleft; 2741558Srgrimes{ 2751558Srgrimes static int first; 2761558Srgrimes static char hostname[MAXHOSTNAMELEN + 1]; 2771558Srgrimes FILE *pf; 2781558Srgrimes char wcmd[MAXPATHLEN + 4]; 27932399Salex extern char **environ; 2801558Srgrimes 2811558Srgrimes if (!first++) 2821558Srgrimes (void)gethostname(hostname, sizeof(hostname)); 2831558Srgrimes 2841558Srgrimes /* undoc -n option to wall suppresses normal wall banner */ 2851558Srgrimes (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 28632399Salex environ = restricted_environ; 2871558Srgrimes if (!(pf = popen(wcmd, "w"))) { 2881558Srgrimes syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 2891558Srgrimes return; 2901558Srgrimes } 2911558Srgrimes 2921558Srgrimes (void)fprintf(pf, 2931558Srgrimes "\007*** %sSystem shutdown message from %s@%s ***\007\n", 2941558Srgrimes timeleft ? "": "FINAL ", whom, hostname); 2951558Srgrimes 2961558Srgrimes if (timeleft > 10*60) 2971558Srgrimes (void)fprintf(pf, "System going down at %5.5s\n\n", 2981558Srgrimes ctime(&shuttime) + 11); 2991558Srgrimes else if (timeleft > 59) 3001558Srgrimes (void)fprintf(pf, "System going down in %d minute%s\n\n", 3011558Srgrimes timeleft / 60, (timeleft > 60) ? "s" : ""); 3021558Srgrimes else if (timeleft) 3031558Srgrimes (void)fprintf(pf, "System going down in 30 seconds\n\n"); 3041558Srgrimes else 3051558Srgrimes (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 3061558Srgrimes 3071558Srgrimes if (mbuflen) 3081558Srgrimes (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 3091558Srgrimes 3101558Srgrimes /* 3111558Srgrimes * play some games, just in case wall doesn't come back 31238036Scharnier * probably unnecessary, given that wall is careful. 3131558Srgrimes */ 3141558Srgrimes if (!setjmp(alarmbuf)) { 3151558Srgrimes (void)signal(SIGALRM, timeout); 3161558Srgrimes (void)alarm((u_int)30); 3171558Srgrimes (void)pclose(pf); 3181558Srgrimes (void)alarm((u_int)0); 3191558Srgrimes (void)signal(SIGALRM, SIG_DFL); 3201558Srgrimes } 3211558Srgrimes} 3221558Srgrimes 3231558Srgrimesvoid 3241558Srgrimestimeout(signo) 3251558Srgrimes int signo; 3261558Srgrimes{ 3271558Srgrimes longjmp(alarmbuf, 1); 3281558Srgrimes} 3291558Srgrimes 3301558Srgrimesvoid 3311558Srgrimesdie_you_gravy_sucking_pig_dog() 3321558Srgrimes{ 33332399Salex char *empty_environ[] = { NULL }; 3341558Srgrimes 3351558Srgrimes syslog(LOG_NOTICE, "%s by %s: %s", 33641666Smsmith doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 33741666Smsmith "shutdown", whom, mbuf); 3381558Srgrimes (void)sleep(2); 3391558Srgrimes 3401558Srgrimes (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 3411558Srgrimes if (killflg) { 3421558Srgrimes (void)printf("\rbut you'll have to do it yourself\r\n"); 3434844Sats exit(0); 3441558Srgrimes } 3451558Srgrimes#ifdef DEBUG 3461558Srgrimes if (doreboot) 3471558Srgrimes (void)printf("reboot"); 3481558Srgrimes else if (dohalt) 3491558Srgrimes (void)printf("halt"); 35041666Smsmith else if (dopower) 35141666Smsmith (void)printf("power-down"); 3521558Srgrimes if (nosync) 3531558Srgrimes (void)printf(" no sync"); 3541558Srgrimes (void)printf("\nkill -HUP 1\n"); 3551558Srgrimes#else 3561558Srgrimes if (doreboot) { 35732399Salex execle(_PATH_REBOOT, "reboot", "-l", nosync, 35832399Salex (char *)NULL, empty_environ); 3591558Srgrimes syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 36032399Salex warn(_PATH_REBOOT); 3611558Srgrimes } 3621558Srgrimes else if (dohalt) { 36332399Salex execle(_PATH_HALT, "halt", "-l", nosync, 36432399Salex (char *)NULL, empty_environ); 3651558Srgrimes syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 36632399Salex warn(_PATH_HALT); 3671558Srgrimes } 36841666Smsmith else if (dopower) { 36941666Smsmith execle(_PATH_HALT, "halt", "-l", "-p", nosync, 37041666Smsmith (char *)NULL, empty_environ); 37141666Smsmith syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 37241666Smsmith warn(_PATH_HALT); 37341666Smsmith } 3741558Srgrimes (void)kill(1, SIGTERM); /* to single user */ 3751558Srgrimes#endif 3761558Srgrimes finish(0); 3771558Srgrimes} 3781558Srgrimes 3791558Srgrimes#define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 3801558Srgrimes 3811558Srgrimesvoid 3821558Srgrimesgetoffset(timearg) 3831558Srgrimes register char *timearg; 3841558Srgrimes{ 3851558Srgrimes register struct tm *lt; 3861558Srgrimes register char *p; 3871558Srgrimes time_t now; 38832328Salex int this_year; 3891558Srgrimes 39048062Sjkoshy (void)time(&now); 39148062Sjkoshy 3921558Srgrimes if (!strcasecmp(timearg, "now")) { /* now */ 3931558Srgrimes offset = 0; 39448062Sjkoshy shuttime = now; 3951558Srgrimes return; 3961558Srgrimes } 3971558Srgrimes 3981558Srgrimes if (*timearg == '+') { /* +minutes */ 3991558Srgrimes if (!isdigit(*++timearg)) 4001558Srgrimes badtime(); 40148004Sru if ((offset = atoi(timearg) * 60) < 0) 40248004Sru badtime(); 4031558Srgrimes shuttime = now + offset; 4041558Srgrimes return; 4051558Srgrimes } 4061558Srgrimes 4071558Srgrimes /* handle hh:mm by getting rid of the colon */ 4081558Srgrimes for (p = timearg; *p; ++p) 4091558Srgrimes if (!isascii(*p) || !isdigit(*p)) 4101558Srgrimes if (*p == ':' && strlen(p) == 3) { 4111558Srgrimes p[0] = p[1]; 4121558Srgrimes p[1] = p[2]; 4131558Srgrimes p[2] = '\0'; 4141558Srgrimes } 4151558Srgrimes else 4161558Srgrimes badtime(); 4171558Srgrimes 4181558Srgrimes unsetenv("TZ"); /* OUR timezone */ 4191558Srgrimes lt = localtime(&now); /* current time val */ 4201558Srgrimes 4211558Srgrimes switch(strlen(timearg)) { 4221558Srgrimes case 10: 42332328Salex this_year = lt->tm_year; 4241558Srgrimes lt->tm_year = ATOI2(timearg); 42532328Salex /* 42632328Salex * check if the specified year is in the next century. 42732328Salex * allow for one year of user error as many people will 42832328Salex * enter n - 1 at the start of year n. 42932328Salex */ 43032328Salex if (lt->tm_year < (this_year % 100) - 1) 43132328Salex lt->tm_year += 100; 43232329Salex /* adjust for the year 2000 and beyond */ 43332328Salex lt->tm_year += (this_year - (this_year % 100)); 4341558Srgrimes /* FALLTHROUGH */ 4351558Srgrimes case 8: 4361558Srgrimes lt->tm_mon = ATOI2(timearg); 4371558Srgrimes if (--lt->tm_mon < 0 || lt->tm_mon > 11) 4381558Srgrimes badtime(); 4391558Srgrimes /* FALLTHROUGH */ 4401558Srgrimes case 6: 4411558Srgrimes lt->tm_mday = ATOI2(timearg); 4421558Srgrimes if (lt->tm_mday < 1 || lt->tm_mday > 31) 4431558Srgrimes badtime(); 4441558Srgrimes /* FALLTHROUGH */ 4451558Srgrimes case 4: 4461558Srgrimes lt->tm_hour = ATOI2(timearg); 4471558Srgrimes if (lt->tm_hour < 0 || lt->tm_hour > 23) 4481558Srgrimes badtime(); 4491558Srgrimes lt->tm_min = ATOI2(timearg); 4501558Srgrimes if (lt->tm_min < 0 || lt->tm_min > 59) 4511558Srgrimes badtime(); 4521558Srgrimes lt->tm_sec = 0; 4531558Srgrimes if ((shuttime = mktime(lt)) == -1) 4541558Srgrimes badtime(); 45526737Scharnier if ((offset = shuttime - now) < 0) 45626737Scharnier errx(1, "that time is already past."); 4571558Srgrimes break; 4581558Srgrimes default: 4591558Srgrimes badtime(); 4601558Srgrimes } 4611558Srgrimes} 4621558Srgrimes 4631558Srgrimes#define NOMSG "\n\nNO LOGINS: System going down at " 4641558Srgrimesvoid 4651558Srgrimesnolog() 4661558Srgrimes{ 4671558Srgrimes int logfd; 4681558Srgrimes char *ct; 4691558Srgrimes 4701558Srgrimes (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 4711558Srgrimes (void)signal(SIGINT, finish); 4721558Srgrimes (void)signal(SIGHUP, finish); 4731558Srgrimes (void)signal(SIGQUIT, finish); 4741558Srgrimes (void)signal(SIGTERM, finish); 4751558Srgrimes if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 4761558Srgrimes 0664)) >= 0) { 4771558Srgrimes (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 4781558Srgrimes ct = ctime(&shuttime); 4791558Srgrimes (void)write(logfd, ct + 11, 5); 4801558Srgrimes (void)write(logfd, "\n\n", 2); 4811558Srgrimes (void)write(logfd, mbuf, strlen(mbuf)); 4821558Srgrimes (void)close(logfd); 4831558Srgrimes } 4841558Srgrimes} 4851558Srgrimes 4861558Srgrimesvoid 4871558Srgrimesfinish(signo) 4881558Srgrimes int signo; 4891558Srgrimes{ 49041684Sbde if (!killflg) 49141684Sbde (void)unlink(_PATH_NOLOGIN); 4921558Srgrimes exit(0); 4931558Srgrimes} 4941558Srgrimes 4951558Srgrimesvoid 4961558Srgrimesbadtime() 4971558Srgrimes{ 49838036Scharnier errx(1, "bad time format"); 4991558Srgrimes} 5001558Srgrimes 5011558Srgrimesvoid 5021558Srgrimesusage() 5031558Srgrimes{ 50441683Sbde fprintf(stderr, 50541683Sbde "usage: shutdown [-] [-hknpr] time [warning-message ...]\n"); 5061558Srgrimes exit(1); 5071558Srgrimes} 508