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daemon: fatal() function.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-01-22 06:41:48 +10:30
parent 89f1f1548e
commit 7b766f4bc8
2 changed files with 52 additions and 16 deletions
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59
daemon/log.c
View file

@ -13,6 +13,7 @@
#include <stdio.h> #include <stdio.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h>
struct log_entry { struct log_entry {
struct list_node list; struct list_node list;
@ -395,12 +396,15 @@ static struct log *crashlog;
static void log_crash(int sig) static void log_crash(int sig)
{ {
log_broken(crashlog, "FATAL SIGNAL %i RECEIVED", sig); const char *logfile = NULL;
if (sig) {
/* FIXME: Backtrace! */ /* FIXME: Backtrace! */
log_broken(crashlog, "FATAL SIGNAL %i RECEIVED", sig);
}
if (crashlog->lr->print == log_default_print) { if (crashlog->lr->print == log_default_print) {
int fd; int fd;
const char *logfile;
/* We expect to be in config dir. */ /* We expect to be in config dir. */
logfile = "crash.log"; logfile = "crash.log";
@ -408,27 +412,37 @@ static void log_crash(int sig)
if (fd < 0) { if (fd < 0) {
logfile = "/tmp/lighning-crash.log"; logfile = "/tmp/lighning-crash.log";
fd = open(logfile, O_WRONLY|O_CREAT, 0600); fd = open(logfile, O_WRONLY|O_CREAT, 0600);
if (fd < 0)
return;
} }
/* Dump entire log. */ /* Dump entire log. */
if (fd >= 0) {
log_dump_to_file(fd, crashlog->lr); log_dump_to_file(fd, crashlog->lr);
fprintf(stderr, "Fatal signal %u (see log in %s)\n", close(fd);
sig, logfile);
} else } else
/* Log is in default place. */ logfile = NULL;
fprintf(stderr, "Fatal signal %u\n", sig); }
if (sig)
fprintf(stderr, "Fatal signal %u. ", sig);
if (logfile)
fprintf(stderr, "Log dumped in %s", logfile);
fprintf(stderr, "\n");
} }
void crashlog_activate(struct log *log) void crashlog_activate(struct log *log)
{ {
struct sigaction sa;
crashlog = log; crashlog = log;
signal(SIGILL, log_crash);
signal(SIGABRT, log_crash); sa.sa_handler = log_crash;
signal(SIGFPE, log_crash); sigemptyset(&sa.sa_mask);
signal(SIGSEGV, log_crash); /* We want to fall through to default handler */
signal(SIGBUS, log_crash); 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 log_dump_to_file(int fd, const struct log_record *lr) void log_dump_to_file(int fd, const struct log_record *lr)
@ -454,3 +468,22 @@ void log_dump_to_file(int fd, const struct log_record *lr)
log_each_line(lr, log_one_line, &data); log_each_line(lr, log_one_line, &data);
write_all(fd, "\n\n", strlen("\n\n")); write_all(fd, "\n\n", strlen("\n\n"));
} }
void fatal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
/* Early on, we just dump errors to stderr. */
if (crashlog) {
va_start(ap, fmt);
logv(crashlog, LOG_BROKEN, fmt, ap);
va_end(ap);
log_crash(0);
}
exit(1);
}

3
daemon/log.h
View file

@ -95,4 +95,7 @@ void log_each_line_(const struct log_record *lr,
void log_dump_to_file(int fd, const struct log_record *lr); void log_dump_to_file(int fd, const struct log_record *lr);
void opt_register_logging(struct log *log); void opt_register_logging(struct log *log);
void crashlog_activate(struct log *log); void crashlog_activate(struct log *log);
/* Before the crashlog is activated, just prints to stderr. */
void NORETURN PRINTF_FMT(1,2) fatal(const char *fmt, ...);
#endif /* LIGHTNING_DAEMON_LOG_H */ #endif /* LIGHTNING_DAEMON_LOG_H */