| File: | src/sbin/reboot/reboot.c |
| Warning: | line 118, column 2 Value stored to 'argv' is never read |
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| 1 | /* $OpenBSD: reboot.c,v 1.38 2017/08/22 00:30:16 sf Exp $ */ |
| 2 | /* $NetBSD: reboot.c,v 1.8 1995/10/05 05:36:22 mycroft Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1980, 1986, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/reboot.h> |
| 35 | #include <sys/sysctl.h> |
| 36 | #include <sys/time.h> |
| 37 | #include <sys/wait.h> |
| 38 | #include <machine/cpu.h> |
| 39 | #include <signal.h> |
| 40 | #include <pwd.h> |
| 41 | #include <errno(*__errno()).h> |
| 42 | #include <err.h> |
| 43 | #include <fcntl.h> |
| 44 | #include <termios.h> |
| 45 | #include <syslog.h> |
| 46 | #include <unistd.h> |
| 47 | #include <stdio.h> |
| 48 | #include <stdlib.h> |
| 49 | #include <string.h> |
| 50 | #include <paths.h> |
| 51 | #include <util.h> |
| 52 | |
| 53 | void usage(void); |
| 54 | extern char *__progname; |
| 55 | |
| 56 | int dohalt; |
| 57 | |
| 58 | #define _PATH_RC"/etc/rc" "/etc/rc" |
| 59 | |
| 60 | static void |
| 61 | sleep_while_procs(int seconds) |
| 62 | { |
| 63 | while (seconds > 0) { |
| 64 | if (kill(-1, 0) == -1 && errno(*__errno()) == ESRCH3) |
| 65 | return; |
| 66 | sleep(1); |
| 67 | seconds--; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | int |
| 72 | main(int argc, char *argv[]) |
| 73 | { |
| 74 | unsigned int i; |
| 75 | struct passwd *pw; |
| 76 | int ch, howto, lflag, nflag, pflag, qflag; |
| 77 | char *p, *user; |
| 78 | sigset_t mask; |
| 79 | |
| 80 | p = __progname; |
| 81 | |
| 82 | /* Nuke login shell */ |
| 83 | if (*p == '-') |
| 84 | p++; |
| 85 | |
| 86 | howto = dohalt = lflag = nflag = pflag = qflag = 0; |
| 87 | if (!strcmp(p, "halt")) { |
| 88 | dohalt = 1; |
| 89 | howto = RB_HALT0x00008; |
| 90 | } |
| 91 | |
| 92 | while ((ch = getopt(argc, argv, "dlnpq")) != -1) |
| 93 | switch (ch) { |
| 94 | case 'd': |
| 95 | howto |= RB_DUMP0x00100; |
| 96 | break; |
| 97 | case 'l': /* Undocumented; used by shutdown. */ |
| 98 | lflag = 1; |
| 99 | break; |
| 100 | case 'n': |
| 101 | nflag = 1; |
| 102 | howto |= RB_NOSYNC0x00004; |
| 103 | break; |
| 104 | case 'p': |
| 105 | /* Only works if we're called as halt. */ |
| 106 | if (dohalt) { |
| 107 | pflag = 1; |
| 108 | howto |= RB_POWERDOWN0x01000; |
| 109 | } |
| 110 | break; |
| 111 | case 'q': |
| 112 | qflag = 1; |
| 113 | break; |
| 114 | default: |
| 115 | usage(); |
| 116 | } |
| 117 | argc -= optind; |
| 118 | argv += optind; |
Value stored to 'argv' is never read | |
| 119 | |
| 120 | if (argc) |
| 121 | usage(); |
| 122 | |
| 123 | if (geteuid()) |
| 124 | errx(1, "%s", strerror(EPERM1)); |
| 125 | |
| 126 | #ifdef CPU_LIDACTION14 |
| 127 | if (howto & RB_POWERDOWN0x01000) { |
| 128 | /* Disable suspending on laptop lid close */ |
| 129 | int mib[] = {CTL_MACHDEP7, CPU_LIDACTION14}; |
| 130 | int lidaction = 0; |
| 131 | |
| 132 | if (sysctl(mib, 2, NULL((void *)0), NULL((void *)0), &lidaction, |
| 133 | sizeof(lidaction)) == -1 && errno(*__errno()) != EOPNOTSUPP45) |
| 134 | warn("sysctl"); |
| 135 | } |
| 136 | #endif /* CPU_LIDACTION */ |
| 137 | |
| 138 | if (qflag) { |
| 139 | reboot(howto); |
| 140 | err(1, "reboot"); |
| 141 | } |
| 142 | |
| 143 | /* Log the reboot. */ |
| 144 | if (!lflag) { |
| 145 | if ((user = getlogin()) == NULL((void *)0)) |
| 146 | user = (pw = getpwuid(getuid())) ? |
| 147 | pw->pw_name : "???"; |
| 148 | if (dohalt) { |
| 149 | openlog("halt", 0, LOG_AUTH(4<<3) | LOG_CONS0x02); |
| 150 | if (pflag) { |
| 151 | syslog(LOG_CRIT2, |
| 152 | "halted (with powerdown) by %s", user); |
| 153 | } else { |
| 154 | syslog(LOG_CRIT2, "halted by %s", user); |
| 155 | } |
| 156 | } else { |
| 157 | openlog("reboot", 0, LOG_AUTH(4<<3) | LOG_CONS0x02); |
| 158 | syslog(LOG_CRIT2, "rebooted by %s", user); |
| 159 | } |
| 160 | } |
| 161 | logwtmp("~", "shutdown", ""); |
| 162 | |
| 163 | /* |
| 164 | * Do a sync early on, so disks start transfers while we're off |
| 165 | * killing processes. Don't worry about writes done before the |
| 166 | * processes die, the reboot system call syncs the disks. |
| 167 | */ |
| 168 | if (!nflag) |
| 169 | sync(); |
| 170 | |
| 171 | /* Just stop init -- if we fail, we'll restart it. */ |
| 172 | if (kill(1, SIGTSTP18) == -1) |
| 173 | err(1, "SIGTSTP init"); |
| 174 | |
| 175 | /* Ignore the SIGHUP we get when our parent shell dies. */ |
| 176 | (void)signal(SIGHUP1, SIG_IGN(void (*)(int))1); |
| 177 | |
| 178 | /* |
| 179 | * If we're running in a pipeline, we don't want to die |
| 180 | * after killing whatever we're writing to. |
| 181 | */ |
| 182 | (void)signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 183 | |
| 184 | if (access(_PATH_RC"/etc/rc", R_OK0x04) != -1) { |
| 185 | pid_t pid; |
| 186 | struct termios t; |
| 187 | int fd, status; |
| 188 | |
| 189 | switch ((pid = fork())) { |
| 190 | case -1: |
| 191 | break; |
| 192 | case 0: |
| 193 | if (revoke(_PATH_CONSOLE"/dev/console") == -1) |
| 194 | warn("revoke"); |
| 195 | if (setsid() == -1) |
| 196 | warn("setsid"); |
| 197 | fd = open(_PATH_CONSOLE"/dev/console", O_RDWR0x0002); |
| 198 | if (fd == -1) |
| 199 | warn("open"); |
| 200 | dup2(fd, 0); |
| 201 | dup2(fd, 1); |
| 202 | dup2(fd, 2); |
| 203 | if (fd > 2) |
| 204 | close(fd); |
| 205 | |
| 206 | /* At a minimum... */ |
| 207 | tcgetattr(0, &t); |
| 208 | t.c_oflag |= (ONLCR0x00000002 | OPOST0x00000001); |
| 209 | tcsetattr(0, TCSANOW0, &t); |
| 210 | |
| 211 | execl(_PATH_BSHELL"/bin/sh", "sh", _PATH_RC"/etc/rc", "shutdown", (char *)NULL((void *)0)); |
| 212 | _exit(1); |
| 213 | default: |
| 214 | /* rc exits 2 if powerdown=YES in rc.shutdown */ |
| 215 | waitpid(pid, &status, 0); |
| 216 | if (dohalt && WIFEXITED(status)(((status) & 0177) == 0) && WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) == 2) |
| 217 | howto |= RB_POWERDOWN0x01000; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Point of no return, block all signals so we are sure to |
| 223 | * reach the call to reboot(2) unmolested. |
| 224 | */ |
| 225 | sigfillset(&mask); |
| 226 | sigprocmask(SIG_BLOCK1, &mask, NULL((void *)0)); |
| 227 | |
| 228 | /* Send a SIGTERM first, a chance to save the buffers. */ |
| 229 | if (kill(-1, SIGTERM15) == -1) { |
| 230 | /* |
| 231 | * If ESRCH, everything's OK: we're the only non-system |
| 232 | * process! That can happen e.g. via 'exec reboot' in |
| 233 | * single-user mode. |
| 234 | */ |
| 235 | if (errno(*__errno()) != ESRCH3) { |
| 236 | warn("SIGTERM processes"); |
| 237 | goto restart; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * After the processes receive the signal, start the rest of the |
| 243 | * buffers on their way. Wait 5 seconds between the SIGTERM and |
| 244 | * the SIGKILL to give everybody a chance. |
| 245 | */ |
| 246 | sleep_while_procs(2); |
| 247 | if (!nflag) |
| 248 | sync(); |
| 249 | sleep_while_procs(3); |
| 250 | |
| 251 | for (i = 1;; ++i) { |
| 252 | if (kill(-1, SIGKILL9) == -1) { |
| 253 | if (errno(*__errno()) == ESRCH3) |
| 254 | break; |
| 255 | goto restart; |
| 256 | } |
| 257 | if (i > 5) { |
| 258 | warnx("WARNING: some process(es) wouldn't die"); |
| 259 | break; |
| 260 | } |
| 261 | sleep_while_procs(2 * i); |
| 262 | } |
| 263 | |
| 264 | reboot(howto); |
| 265 | /* FALLTHROUGH */ |
| 266 | |
| 267 | restart: |
| 268 | errx(1, kill(1, SIGHUP1) == -1 ? "(can't restart init): " : ""); |
| 269 | /* NOTREACHED */ |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | usage(void) |
| 274 | { |
| 275 | fprintf(stderr(&__sF[2]), "usage: %s [-dn%sq]\n", __progname, |
| 276 | dohalt ? "p" : ""); |
| 277 | exit(1); |
| 278 | } |