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subdaemons: catch backtrace on fatal signals.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-09-12 14:26:59 +09:30 committed by Christian Decker
parent db19873ee4
commit a21e31b2b2
1 changed files with 46 additions and 0 deletions
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46
common/debug.c
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@ -1,16 +1,62 @@
#include <backtrace.h>
#include <ccan/err/err.h>
#include <ccan/str/str.h>
#include <common/debug.h>
#include <common/dev_disconnect.h>
#include <common/status.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
static struct backtrace_state *backtrace_state;
static int backtrace_status(void *unused, uintptr_t pc,
const char *filename, int lineno,
const char *function)
{
status_trace("backtrace: %s:%u (%s) %p",
filename, lineno, function, (void *)pc);
return 0;
}
static void crashdump(int sig)
{
/* We do stderr first, since it's most reliable. */
warnx("Fatal signal %u", sig);
backtrace_print(backtrace_state, 0, stderr);
/* Now send to parent. */
backtrace_full(backtrace_state, 0, backtrace_status, NULL, NULL);
status_failed(STATUS_FAIL_INTERNAL_ERROR, "FATAL SIGNAL %u", sig);
}
static void crashlog_activate(void)
{
struct sigaction sa;
sa.sa_handler = crashdump;
sigemptyset(&sa.sa_mask);
/* We want to fall through to default handler */
sa.sa_flags = SA_RESETHAND;
sigaction(SIGILL, &sa, NULL);
sigaction(SIGABRT, &sa, NULL);
sigaction(SIGFPE, &sa, NULL);
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGBUS, &sa, NULL);
}
void subdaemon_debug(int argc, char *argv[])
{
int i;
bool printed = false;
err_set_progname(argv[0]);
backtrace_state = backtrace_create_state(argv[0], 0, NULL, NULL);
crashlog_activate();
for (i = 1; i < argc; i++) {
if (strstarts(argv[i], "--dev-disconnect=")) {
dev_disconnect_init(atoi(argv[i]