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Code

main: introduce configurable crash shell

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This commit is contained in:
Lennart Poettering 2010-04-10 22:35:37 +02:00
parent e8536954c5
commit 4fc935cad4
1 changed files with 53 additions and 5 deletions
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58
main.c
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@ -29,6 +29,7 @@
#include <sys/stat.h>
#include <getopt.h>
#include <signal.h>
#include <sys/wait.h>
#include "manager.h"
#include "log.h"
@ -45,7 +46,9 @@ static enum {
static char *default_unit = NULL;
static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
static bool dump_core = true;
static bool crash_shell = true;
_noreturn static void freeze(void) {
for (;;)
@ -59,10 +62,8 @@ _noreturn static void crash(int sig) {
else {
pid_t pid;
log_warning("Caugh <%s>, dumping core.", strsignal(sig));
if ((pid = fork()) < 0)
log_error("Caught <%s>, cannot dump core: %s", strsignal(sig), strerror(errno));
log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
else if (pid == 0) {
struct sigaction sa;
@ -87,10 +88,29 @@ _noreturn static void crash(int 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);
}
}
log_error("Freezing execution.");
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();
}
@ -146,6 +166,33 @@ static int parse_proc_cmdline_word(const char *word) {
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.")) {
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");
} else {
unsigned i;
@ -368,7 +415,8 @@ int main(int argc, char *argv[]) {
log_open_kmsg();
/* Make sure we leave a core dump */
install_crash_handler();
if (getpid() == 1)
install_crash_handler();
log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));