4.3BSD/usr/src/etc/shutdown.c
/*
* Copyright (c) 1983,1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983,1986 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)shutdown.c 5.6 (Berkeley) 5/26/86";
#endif not lint
#include <stdio.h>
#include <ctype.h>
#include <signal.h>
#include <setjmp.h>
#include <utmp.h>
#include <pwd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/param.h>
#include <sys/syslog.h>
/*
* /etc/shutdown when [messages]
*
* allow super users to tell users and remind users
* of iminent shutdown of unix
* and shut it down automatically
* and even reboot or halt the machine if they desire
*/
#define REBOOT "/etc/reboot"
#define HALT "/etc/halt"
#define MAXINTS 20
#define HOURS *3600
#define MINUTES *60
#define SECONDS
#define NLOG 600 /* no of bytes possible for message */
#define NOLOGTIME 5 MINUTES
#define IGNOREUSER "sleeper"
char hostname[MAXHOSTNAMELEN];
int timeout();
time_t getsdt();
extern char *ctime();
extern struct tm *localtime();
extern long time();
extern char *strcpy();
extern char *strncat();
extern off_t lseek();
struct utmp utmp;
int sint;
int stogo;
char tpath[] = "/dev/";
int nlflag = 1; /* nolog yet to be done */
int killflg = 1;
int doreboot = 0;
int halt = 0;
int fast = 0;
char *nosync = NULL;
char nosyncflag[] = "-n";
char term[sizeof tpath + sizeof utmp.ut_line];
char tbuf[BUFSIZ];
char nolog1[] = "\n\nNO LOGINS: System going down at %5.5s\n\n";
char nolog2[NLOG+1];
#ifdef DEBUG
char nologin[] = "nologin";
char fastboot[] = "fastboot";
#else
char nologin[] = "/etc/nologin";
char fastboot[] = "/fastboot";
#endif
time_t nowtime;
jmp_buf alarmbuf;
struct interval {
int stogo;
int sint;
} interval[] = {
4 HOURS, 1 HOURS,
2 HOURS, 30 MINUTES,
1 HOURS, 15 MINUTES,
30 MINUTES, 10 MINUTES,
15 MINUTES, 5 MINUTES,
10 MINUTES, 5 MINUTES,
5 MINUTES, 3 MINUTES,
2 MINUTES, 1 MINUTES,
1 MINUTES, 30 SECONDS,
0 SECONDS, 0 SECONDS
};
char *shutter, *getlogin();
main(argc,argv)
int argc;
char **argv;
{
register i, ufd;
register char *f;
char *ts;
time_t sdt;
int h, m;
int first;
FILE *termf;
struct passwd *pw, *getpwuid();
extern char *strcat();
extern uid_t geteuid();
shutter = getlogin();
if (shutter == 0 && (pw = getpwuid(getuid())))
shutter = pw->pw_name;
if (shutter == 0)
shutter = "???";
(void) gethostname(hostname, sizeof (hostname));
openlog("shutdown", 0, LOG_AUTH);
argc--, argv++;
while (argc > 0 && (f = argv[0], *f++ == '-')) {
while (i = *f++) switch (i) {
case 'k':
killflg = 0;
continue;
case 'n':
nosync = nosyncflag;
continue;
case 'f':
fast = 1;
continue;
case 'r':
doreboot = 1;
continue;
case 'h':
halt = 1;
continue;
default:
fprintf(stderr, "shutdown: '%c' - unknown flag\n", i);
exit(1);
}
argc--, argv++;
}
if (argc < 1) {
/* argv[0] is not available after the argument handling. */
printf("Usage: shutdown [ -krhfn ] shutdowntime [ message ]\n");
finish();
}
if (fast && (nosync == nosyncflag)) {
printf ("shutdown: Incompatible switches 'fast' & 'nosync'\n");
finish();
}
if (geteuid()) {
fprintf(stderr, "NOT super-user\n");
finish();
}
nowtime = time((long *)0);
sdt = getsdt(argv[0]);
argc--, argv++;
nolog2[0] = '\0';
while (argc-- > 0) {
(void) strcat(nolog2, " ");
(void) strcat(nolog2, *argv++);
}
m = ((stogo = sdt - nowtime) + 30)/60;
h = m/60;
m %= 60;
ts = ctime(&sdt);
printf("Shutdown at %5.5s (in ", ts+11);
if (h > 0)
printf("%d hour%s ", h, h != 1 ? "s" : "");
printf("%d minute%s) ", m, m != 1 ? "s" : "");
#ifndef DEBUG
(void) signal(SIGHUP, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, SIG_IGN);
#endif
(void) signal(SIGTTOU, SIG_IGN);
(void) signal(SIGTERM, finish);
(void) signal(SIGALRM, timeout);
(void) setpriority(PRIO_PROCESS, 0, PRIO_MIN);
(void) fflush(stdout);
#ifndef DEBUG
if (i = fork()) {
printf("[pid %d]\n", i);
exit(0);
}
#else
(void) putc('\n', stdout);
#endif
sint = 1 HOURS;
f = "";
ufd = open("/etc/utmp",0);
if (ufd < 0) {
perror("shutdown: /etc/utmp");
exit(1);
}
first = 1;
for (;;) {
for (i = 0; stogo <= interval[i].stogo && interval[i].sint; i++)
sint = interval[i].sint;
if (stogo > 0 && (stogo-sint) < interval[i].stogo)
sint = stogo - interval[i].stogo;
if (stogo <= NOLOGTIME && nlflag) {
nlflag = 0;
nolog(sdt);
}
if (sint >= stogo || sint == 0)
f = "FINAL ";
nowtime = time((long *)0);
(void) lseek(ufd, 0L, 0);
while (read(ufd,(char *)&utmp,sizeof utmp)==sizeof utmp)
if (utmp.ut_name[0] &&
strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name))) {
if (setjmp(alarmbuf))
continue;
(void) strcpy(term, tpath);
(void) strncat(term, utmp.ut_line, sizeof utmp.ut_line);
(void) alarm(3);
#ifdef DEBUG
if ((termf = stdout) != NULL)
#else
if ((termf = fopen(term, "w")) != NULL)
#endif
{
(void) alarm(0);
setbuf(termf, tbuf);
fprintf(termf, "\n\r\n");
warn(termf, sdt, nowtime, f);
if (first || sdt - nowtime > 1 MINUTES) {
if (*nolog2)
fprintf(termf, "\t...%s", nolog2);
}
(void) fputc('\r', termf);
(void) fputc('\n', termf);
(void) alarm(5);
#ifdef DEBUG
(void) fflush(termf);
#else
(void) fclose(termf);
#endif
(void) alarm(0);
}
}
if (stogo <= 0) {
printf("\n\007\007System shutdown time has arrived\007\007\n");
syslog(LOG_CRIT, "%s by %s: %s",
doreboot ? "reboot" : halt ? "halt" : "shutdown",
shutter, nolog2);
sleep(2);
(void) unlink(nologin);
if (!killflg) {
printf("but you'll have to do it yourself\n");
finish();
}
if (fast)
doitfast();
#ifndef DEBUG
if (doreboot)
execle(REBOOT, "reboot", "-l", nosync, 0, 0);
if (halt)
execle(HALT, "halt", "-l", nosync, 0, 0);
(void) kill(1, SIGTERM); /* to single user */
#else
if (doreboot)
printf("REBOOT");
if (halt)
printf(" HALT");
if (fast)
printf(" -l %s (without fsck's)\n", nosync);
else
printf(" -l %s\n", nosync);
else
printf("kill -HUP 1\n");
#endif
finish();
}
stogo = sdt - time((long *) 0);
if (stogo > 0 && sint > 0)
sleep((unsigned)(sint<stogo ? sint : stogo));
stogo -= sint;
first = 0;
}
}
time_t
getsdt(s)
register char *s;
{
time_t t, t1, tim;
register char c;
struct tm *lt;
if (strcmp(s, "now") == 0)
return(nowtime);
if (*s == '+') {
++s;
t = 0;
for (;;) {
c = *s++;
if (!isdigit(c))
break;
t = t * 10 + c - '0';
}
if (t <= 0)
t = 5;
t *= 60;
tim = time((long *) 0) + t;
return(tim);
}
t = 0;
while (strlen(s) > 2 && isdigit(*s))
t = t * 10 + *s++ - '0';
if (*s == ':')
s++;
if (t > 23)
goto badform;
tim = t*60;
t = 0;
while (isdigit(*s))
t = t * 10 + *s++ - '0';
if (t > 59)
goto badform;
tim += t;
tim *= 60;
t1 = time((long *) 0);
lt = localtime(&t1);
t = lt->tm_sec + lt->tm_min*60 + lt->tm_hour*3600;
if (tim < t || tim >= (24*3600)) {
/* before now or after midnight */
printf("That must be tomorrow\nCan't you wait till then?\n");
finish();
}
return (t1 + tim - t);
badform:
printf("Bad time format\n");
finish();
/*NOTREACHED*/
}
warn(term, sdt, now, type)
FILE *term;
time_t sdt, now;
char *type;
{
char *ts;
register delay = sdt - now;
if (delay > 8)
while (delay % 5)
delay++;
fprintf(term,
"\007\007\t*** %sSystem shutdown message from %s@%s ***\r\n\n",
type, shutter, hostname);
ts = ctime(&sdt);
if (delay > 10 MINUTES)
fprintf(term, "System going down at %5.5s\r\n", ts+11);
else if (delay > 95 SECONDS) {
fprintf(term, "System going down in %d minute%s\r\n",
(delay+30)/60, (delay+30)/60 != 1 ? "s" : "");
} else if (delay > 0) {
fprintf(term, "System going down in %d second%s\r\n",
delay, delay != 1 ? "s" : "");
} else
fprintf(term, "System going down IMMEDIATELY\r\n");
}
doitfast()
{
FILE *fastd;
if ((fastd = fopen(fastboot, "w")) != NULL) {
putc('\n', fastd);
(void) fclose(fastd);
}
}
nolog(sdt)
time_t sdt;
{
FILE *nologf;
(void) unlink(nologin); /* in case linked to std file */
if ((nologf = fopen(nologin, "w")) != NULL) {
fprintf(nologf, nolog1, (ctime(&sdt)) + 11);
if (*nolog2)
fprintf(nologf, "\t%s\n", nolog2 + 1);
(void) fclose(nologf);
}
}
finish()
{
(void) signal(SIGTERM, SIG_IGN);
(void) unlink(nologin);
exit(0);
}
timeout()
{
longjmp(alarmbuf, 1);
}