Add glibc backtrace to signal handler

It is very hard to see in github tests what is actually failing
with signals - add the gnu-libc backtrace handler.

diff --git a/lib/fuse_signals.c b/lib/fuse_signals.c
index 048d0471e6e4bcda31b6e90aec92919d4c9863c0..4c1d1728388d24c84b70db8919e01f9bbe444996 100644 (file)
--- a/lib/fuse_signals.c
+++ b/lib/fuse_signals.c
@@ -16,15 +16,30 @@
 #include <string.h>
 #include <signal.h>
 #include <stdlib.h>
+#include <execinfo.h>
 
 static struct fuse_session *fuse_instance;
 
+static void dump_stack(void)
+{
+#ifdef HAVE_BACKTRACE
+       const size_t backtrace_sz = 1024 * 1024;
+       void* backtrace_buffer[backtrace_sz];
+
+       int err_fd = fileno(stderr);
+
+       int trace_len = backtrace(backtrace_buffer, backtrace_sz);
+       backtrace_symbols_fd(backtrace_buffer, trace_len, err_fd);
+#endif
+}
+
 static void exit_handler(int sig)
 {
        if (fuse_instance) {
                fuse_session_exit(fuse_instance);
                if(sig <= 0) {
                        fuse_log(FUSE_LOG_ERR, "assertion error: signal value <= 0\n");
+                       dump_stack();
                        abort();
                }
                fuse_instance->error = sig;

diff --git a/meson.build b/meson.build
index 7d62dcf2bc39fd8e03b7b95010c487f0c101b69f..7d8db7f4a6e5edf3b0dc1a16ccce73443cd6a931 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -61,6 +61,8 @@ private_cfg.set('HAVE_SETXATTR',
         cc.has_function('setxattr', prefix: '#include <sys/xattr.h>'))
 private_cfg.set('HAVE_ICONV', 
         cc.has_function('iconv', prefix: '#include <iconv.h>'))
+private_cfg.set('HAVE_BACKTRACE',
+        cc.has_function('backtrace', prefix: '#include <execinfo.h>'))
 
 # Test if structs have specific member
 private_cfg.set('HAVE_STRUCT_STAT_ST_ATIM',