#include <sys/types.h>
#include <sys/stat.h>
#include <getopt.h>
+#include <signal.h>
+#include <sys/wait.h>
#include "manager.h"
#include "log.h"
#include "mount-setup.h"
+#include "hostname-setup.h"
+#include "load-fragment.h"
static enum {
ACTION_RUN,
ACTION_HELP,
- ACTION_TEST
+ ACTION_TEST,
+ ACTION_DUMP_CONFIGURATION_ITEMS
} action = ACTION_RUN;
static char *default_unit = NULL;
static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
+static bool dump_core = true;
+static bool crash_shell = false;
+static int crash_chvt = -1;
+
+_noreturn static void freeze(void) {
+ for (;;)
+ pause();
+}
+
+_noreturn static void crash(int sig) {
+
+ if (!dump_core)
+ log_error("Caught <%s>, not dumping core.", strsignal(sig));
+ else {
+ pid_t pid;
+
+ if ((pid = fork()) < 0)
+ log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
+
+ else if (pid == 0) {
+ struct sigaction sa;
+ struct rlimit rl;
+
+ /* Enable default signal handler for core dump */
+ zero(sa);
+ sa.sa_handler = SIG_DFL;
+ assert_se(sigaction(sig, &sa, NULL) == 0);
+
+ /* Don't limit the core dump size */
+ zero(rl);
+ rl.rlim_cur = RLIM_INFINITY;
+ rl.rlim_max = RLIM_INFINITY;
+ setrlimit(RLIMIT_CORE, &rl);
+
+ /* Just to be sure... */
+ assert_se(chdir("/") == 0);
+
+ /* Raise the signal again */
+ raise(sig);
+
+ assert_not_reached("We shouldn't be here...");
+ _exit(1);
+
+ } else {
+ int status, r;
+
+ /* Order things nicely. */
+ if ((r = waitpid(pid, &status, 0)) < 0)
+ log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
+ else if (!WCOREDUMP(status))
+ log_error("Caught <%s>, core dump failed.", strsignal(sig));
+ else
+ log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
+ }
+ }
+
+ if (crash_chvt)
+ chvt(crash_chvt);
+
+ if (crash_shell) {
+ log_info("Executing crash shell in 10s...");
+ sleep(10);
+
+ execl("/bin/sh", "/bin/sh", NULL);
+ log_error("execl() failed: %s", strerror(errno));
+ }
+
+ log_info("Freezing execution.");
+ freeze();
+}
+
+static void install_crash_handler(void) {
+ struct sigaction sa;
+
+ zero(sa);
+
+ sa.sa_handler = crash;
+ sa.sa_flags = SA_NODEFER;
+
+ assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
+ assert_se(sigaction(SIGILL, &sa, NULL) == 0);
+ assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
+ assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
+ assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
+ assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
+}
+
static int set_default_unit(const char *u) {
char *c;
if (log_set_max_level_from_string(word + 18) < 0)
log_warning("Failed to parse log level %s. Ignoring.", word + 18);
+ } else if (startswith(word, "systemd.dump_core=")) {
+ int r;
+
+ if ((r = parse_boolean(word + 18)) < 0)
+ log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
+ else
+ dump_core = r;
+
+ } else if (startswith(word, "systemd.crash_shell=")) {
+ int r;
+
+ if ((r = parse_boolean(word + 20)) < 0)
+ log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
+ else
+ crash_shell = r;
+
+ } else if (startswith(word, "systemd.crash_chvt=")) {
+ int k;
+
+ if (safe_atoi(word + 19, &k) < 0)
+ log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
+ else
+ crash_chvt = k;
+
+ } else if (startswith(word, "systemd.")) {
+
+ log_warning("Unknown kernel switch %s. Ignoring.", word);
+
+ log_info("Supported kernel switches:");
+ log_info("systemd.default=UNIT Default unit to start");
+ log_info("systemd.log_target=console|kmsg|syslog Log target");
+ log_info("systemd.log_level=LEVEL Log level");
+ log_info("systemd.dump_core=0|1 Dump core on crash");
+ log_info("systemd.crash_shell=0|1 On crash run shell");
+ log_info("systemd.crash_chvt=N Change to VT #N on crash");
+
} else {
unsigned i;
/* SysV compatibility */
-
for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
if (streq(word, rlmap[i]))
return set_default_unit(rlmap[i+1]);
ARG_LOG_TARGET,
ARG_DEFAULT,
ARG_RUNNING_AS,
- ARG_TEST
+ ARG_TEST,
+ ARG_DUMP_CONFIGURATION_ITEMS
};
static const struct option options[] = {
{ "running-as", required_argument, NULL, ARG_RUNNING_AS },
{ "test", no_argument, NULL, ARG_TEST },
{ "help", no_argument, NULL, 'h' },
+ { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
{ NULL, 0, NULL, 0 }
};
action = ACTION_TEST;
break;
+ case ARG_DUMP_CONFIGURATION_ITEMS:
+ action = ACTION_DUMP_CONFIGURATION_ITEMS;
+ break;
+
case 'h':
action = ACTION_HELP;
break;
static int help(void) {
printf("%s [options]\n\n"
- " -h --help Show this help\n"
- " --default=UNIT Set default unit\n"
- " --log-level=LEVEL Set log level\n"
- " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
- " --running-as=AS Set running as (init, system, session)\n"
- " --test Determine startup sequence, dump it and exit\n",
+ " -h --help Show this help\n"
+ " --default=UNIT Set default unit\n"
+ " --log-level=LEVEL Set log level\n"
+ " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
+ " --running-as=AS Set running as (init, system, session)\n"
+ " --test Determine startup sequence, dump it and exit\n"
+ " --dump-configuration-items Dump understood unit configuration items\n",
__progname);
return 0;
/* Reset all signal handlers. */
assert_se(reset_all_signal_handlers() == 0);
+ /* If we are init, we can block sigkill. Yay. */
+ signal(SIGKILL, SIG_IGN);
+ signal(SIGPIPE, SIG_IGN);
+
/* Close all open files */
assert_se(close_all_fds(NULL, 0) == 0);
if (action == ACTION_HELP) {
retval = help();
goto finish;
+ } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
+ unit_dump_config_items(stdout);
+ retval = 0;
+ goto finish;
}
assert_se(action == ACTION_RUN || action == ACTION_TEST);
/* Set up PATH unless it is already set */
- setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", false);
+ setenv("PATH",
+ "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+ running_as == MANAGER_INIT);
/* Move out of the way, so that we won't block unmounts */
assert_se(chdir("/") == 0);
/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
dbus_connection_set_change_sigpipe(FALSE);
- /* Open the logging devices, if possible and necessary*/
+ /* Open the logging devices, if possible and necessary */
log_open_syslog();
log_open_kmsg();
+ /* Make sure we leave a core dump without panicing the
+ * kernel. */
+ if (getpid() == 1)
+ install_crash_handler();
+
log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
+ if (running_as == MANAGER_INIT)
+ hostname_setup();
+
if ((r = manager_new(running_as, &m)) < 0) {
log_error("Failed to allocate manager object: %s", strerror(-r));
goto finish;
~ianmdlvl / elogind.git / blobdiff