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    Contents of /tags/mkinitrd-6_1_12/busybox/init/halt.c

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    Revision 939 - (show annotations) (download)
    Tue Nov 17 21:24:51 2009 UTC (14 years, 6 months ago) by niro
    File MIME type: text/plain
    File size: 2265 byte(s) 
    tagged 'mkinitrd-6_1_12'
    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_POWER_OFF
    44 #define RB_POWER_OFF RB_POWERDOWN
    45 #endif
    46
    47 int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    48 int halt_main(int argc UNUSED_PARAM, char **argv)
    49 {
    50 static const int magic[] = {
    51 RB_HALT_SYSTEM,
    52 RB_POWER_OFF,
    53 RB_AUTOBOOT
    54 };
    55 static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
    56
    57 int delay = 0;
    58 int which, flags, rc;
    59
    60 /* Figure out which applet we're running */
    61 for (which = 0; "hpr"[which] != applet_name[0]; which++)
    62 continue;
    63
    64 /* Parse and handle arguments */
    65 opt_complementary = "d+"; /* -d N */
    66 /* We support -w even if !ENABLE_FEATURE_WTMP, in order
    67 * to not break scripts */
    68 flags = getopt32(argv, "d:nfw", &delay);
    69
    70 sleep(delay);
    71
    72 write_wtmp();
    73
    74 if (flags & 8) /* -w */
    75 return EXIT_SUCCESS;
    76
    77 if (!(flags & 2)) /* no -n */
    78 sync();
    79
    80 /* Perform action. */
    81 rc = 1;
    82 if (!(flags & 4)) { /* no -f */
    83 //TODO: I tend to think that signalling linuxrc is wrong
    84 // pity original author didn't comment on it...
    85 if (ENABLE_FEATURE_INITRD) {
    86 pid_t *pidlist = find_pid_by_name("linuxrc");
    87 if (pidlist[0] > 0)
    88 rc = kill(pidlist[0], signals[which]);
    89 if (ENABLE_FEATURE_CLEAN_UP)
    90 free(pidlist);
    91 }
    92 if (rc)
    93 rc = kill(1, signals[which]);
    94 } else
    95 rc = reboot(magic[which]);
    96
    97 if (rc)
    98 bb_error_msg("no");
    99 return rc;
    100 }