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    Contents of /trunk/mkinitrd-magellan/busybox/init/halt.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 2837 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Poweroff reboot and halt, oh my.
    4 *
    5 * Copyright 2006 by Rob Landley <rob@landley.net>
    6 *
    7 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
    8 */
    9
    10 #include "libbb.h"
    11 #include <sys/reboot.h>
    12
    13 #if ENABLE_FEATURE_WTMP
    14 #include <sys/utsname.h>
    15 #include <utmp.h>
    16
    17 static void write_wtmp(void)
    18 {
    19 struct utmp utmp;
    20 struct utsname uts;
    21 if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
    22 close(creat(bb_path_wtmp_file, 0664));
    23 }
    24 memset(&utmp, 0, sizeof(utmp));
    25 utmp.ut_tv.tv_sec = time(NULL);
    26 safe_strncpy(utmp.ut_user, "shutdown", UT_NAMESIZE);
    27 utmp.ut_type = RUN_LVL;
    28 safe_strncpy(utmp.ut_id, "~~", sizeof(utmp.ut_id));
    29 safe_strncpy(utmp.ut_line, "~~", UT_LINESIZE);
    30 if (uname(&uts) == 0)
    31 safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
    32 updwtmp(bb_path_wtmp_file, &utmp);
    33
    34 }
    35 #else
    36 #define write_wtmp() ((void)0)
    37 #endif
    38
    39 #ifndef RB_HALT_SYSTEM
    40 #define RB_HALT_SYSTEM RB_HALT
    41 #endif
    42
    43 #ifndef RB_POWERDOWN
    44 /* Stop system and switch power off if possible. */
    45 # define RB_POWERDOWN 0x4321fedc
    46 #endif
    47 #ifndef RB_POWER_OFF
    48 # define RB_POWER_OFF RB_POWERDOWN
    49 #endif
    50
    51
    52 int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    53 int halt_main(int argc UNUSED_PARAM, char **argv)
    54 {
    55 static const int magic[] = {
    56 RB_HALT_SYSTEM,
    57 RB_POWER_OFF,
    58 RB_AUTOBOOT
    59 };
    60 static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
    61
    62 int delay = 0;
    63 int which, flags, rc;
    64
    65 /* Figure out which applet we're running */
    66 for (which = 0; "hpr"[which] != applet_name[0]; which++)
    67 continue;
    68
    69 /* Parse and handle arguments */
    70 opt_complementary = "d+"; /* -d N */
    71 /* We support -w even if !ENABLE_FEATURE_WTMP,
    72 * in order to not break scripts.
    73 * -i (shut down network interfaces) is ignored.
    74 */
    75 flags = getopt32(argv, "d:nfwi", &delay);
    76
    77 sleep(delay);
    78
    79 write_wtmp();
    80
    81 if (flags & 8) /* -w */
    82 return EXIT_SUCCESS;
    83
    84 if (!(flags & 2)) /* no -n */
    85 sync();
    86
    87 /* Perform action. */
    88 rc = 1;
    89 if (!(flags & 4)) { /* no -f */
    90 //TODO: I tend to think that signalling linuxrc is wrong
    91 // pity original author didn't comment on it...
    92 if (ENABLE_FEATURE_INITRD) {
    93 /* talk to linuxrc */
    94 /* bbox init/linuxrc assumed */
    95 pid_t *pidlist = find_pid_by_name("linuxrc");
    96 if (pidlist[0] > 0)
    97 rc = kill(pidlist[0], signals[which]);
    98 if (ENABLE_FEATURE_CLEAN_UP)
    99 free(pidlist);
    100 }
    101 if (rc) {
    102 /* talk to init */
    103 if (!ENABLE_FEATURE_CALL_TELINIT) {
    104 /* bbox init assumed */
    105 rc = kill(1, signals[which]);
    106 } else {
    107 /* SysV style init assumed */
    108 /* runlevels:
    109 * 0 == shutdown
    110 * 6 == reboot */
    111 rc = execlp(CONFIG_TELINIT_PATH,
    112 CONFIG_TELINIT_PATH,
    113 which == 2 ? "6" : "0",
    114 (char *)NULL
    115 );
    116 }
    117 }
    118 } else {
    119 rc = reboot(magic[which]);
    120 }
    121
    122 if (rc)
    123 bb_perror_nomsg_and_die();
    124 return rc;
    125 }