From 9944b380d1324a4c688f03bd10705b746b176101 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jos=C3=A9=20Bollo?= Date: Wed, 28 Jun 2017 16:13:42 +0200 Subject: [PATCH] Add backtrace on errors MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Change-Id: Id2ce3a62d97fd4148d661b34f7507d7a4bec4fba Signed-off-by: José Bollo --- src/sig-monitor.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/src/sig-monitor.c b/src/sig-monitor.c index aaffaed0..fdaf8c09 100644 --- a/src/sig-monitor.c +++ b/src/sig-monitor.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "sig-monitor.h" #include "verbose.h" @@ -37,6 +38,26 @@ static _Thread_local sigjmp_buf *error_handler; static _Thread_local int thread_timer_set; static _Thread_local timer_t thread_timerid; +/* + * Dumps the current stack + */ +static void dumpstack(int crop) +{ + int idx, count; + void *addresses[1000]; + char **locations; + + count = backtrace(addresses, sizeof addresses / sizeof *addresses); + locations = backtrace_symbols(addresses, count); + if (locations == NULL) + ERROR("can't get the backtrace (returned %d addresses)", count); + else { + for (idx = crop; idx < count; idx++) + ERROR("[BACKTRACE %d/%d] %s", idx - crop + 1, count - crop, locations[idx]); + free(locations); + } +} + /* * Creates a timer for the current thread * @@ -118,6 +139,10 @@ static void on_signal_error(int signum) sigset_t sigset; ERROR("ALERT! signal %d received: %s", signum, strsignal(signum)); + if (error_handler == NULL && signum == SIG_FOR_TIMER) + return; + + dumpstack(3); // unlock signal to allow a new signal to come if (error_handler != NULL) { @@ -126,8 +151,6 @@ static void on_signal_error(int signum) sigprocmask(SIG_UNBLOCK, &sigset, 0); longjmp(*error_handler, signum); } - if (signum == SIG_FOR_TIMER) - return; ERROR("Unmonitored signal %d received: %s", signum, strsignal(signum)); exit(2); } -- 2.16.6